Faculty

Michael P. Harold
Dr. Michael P. Harold

Chair of Chemical and Biomolecular Engineering;
ChBE Chair Professor of Chemical and Biomolecular Engineering

Office Location: S225, Engineering Building 1
Phone: 713-743-4322   |   Fax: 713-743-4323
Email: mharold [at] uh [dot] edu
Harold's research

Education: 

B.S., Chemical Engineering, Pennsylvania State University, (1980)
Ph.D., Chemical Engineering, University of Houston, (1985)

BIo: 

Dr. Michael P. Harold is the ChBE Chair Professor and Department Chair of Chemical and Biomolecular Engineering at the University of Houston. With expertise in reaction engineering and catalysis, Harold is the author of more than 175 peer-reviewed papers and book chapters and has given over 350 presentations and invited lectures. He is the founder and principal investigator of the University of Houston’s Texas Center for Clean Engines, Emissions & Fuels (TxCEF), established in 2003. Mike was appointed Editor-in-Chief of the AIChE Journal in 2012, the 7th in the Journal’s 60-year history.
A Pittsburgh, Pennsylvania native, Harold received his Bachelor’s degree at Pennsylvania State University, and his PhD from the University of Houston. He joined the faculty at University of Massachusetts at Amherst in 1985 where he became Associate Professor. In 1993 Harold joined DuPont Company, where he held several technical and managerial positions. In 2000 Harold returned to the University of Houston where he became the Dow Chair Professor and Department Chair, a position he held for 8 years. He was re-appointed to that position in early 2013. His honors include the Excellence in Applied Catalysis from the Southwest Catalysis Society in 2019, the Ester Farfel Award at the University of Houston in 2013 (highest honor bestowed on a faculty member) and the American Chemical Society’s Fuel Division Richard A. Glenn Award in 2008.

Research Interests: 

Over the past two decades spanning academia and industry, Dr. Harold has coupled probing experiments with predictive models to elucidate the interactions of reaction and transport processes in catalytic reactors. He has advanced the understanding of multi-functional reactors and their use in energy and environmental applications, including the membrane reactor for coupled hydrogen generation and purification, and the adsorptive reactor for lean NOx reduction. His pioneering research has helped to reduce byproduct formation, to improve reactor safety, and to intensify the overall chemical process. Areas of particular interest include reaction-separation devices and materials, catalytic reaction engineering, and combustion processes. Ongoing projects include:

CONVERSION OF MICROALGAE TO LIQUID FUELS

Our nation's most crucial energy challenge is in finding new sources of liquid fuels for transportation. Aquatic biomass is a potential vast, renewable source of liquid fuel.  For example, algae can be grown at high rates on non-arable lands, both in fresh and salt water.  While some strains of algae are edible, it's use for energy does not pose an ethical dilemma. The overarching goal of this research is to advance the knowledge and understanding of catalytic pyrolysis of microalgae into a stabilized liquid that has an acceptable energy content and composition for downstream processing with conventional petroleum refining. The working hypothesis of our research is that algal biomass can be converted into a stable liquid product through a single step catalytic reductive pyrolysis.  Our objectives are to

(i)     understand the effect of reductants on the noncatalytic pyrolysis of model carbohydrates, proteins, and lipids.
(ii)    quantify the effects of metal exchanged zeolite catalysts on the reductive pyrolysis of model compounds.
(iii)   apply the knowledge gained in the model compound studies to whole algae.
(iv)    converge to prescribed performance targets in terms of oxygen content, chemical stability, and sustained catalytic activity.

To achieve these objectives we are applying catalytic reaction engineering tools, with a particular focus on the discovery and development of new catalytic materials and design of new reactors that convert the algal biomass.

High Temperature Inorganic Membrane Reactors

Traditionally, reactors have been designed and operated as stand-alone units, with heat exchange and separations carried out in parallel or sequentially. Our interest is to consolidate these functions into a single, multi-functional device in order to improve performance and reduce cost. Membrane reactors, selective product removal afford considerable improvements in desired product yield. The challenge is tailoring the membrane and catalyst for the reaction system of interest.

High Purity Hydrogen Generation for Fuel Cells

A specific application of membrane reactors is in the generation of high purity hydrogen from liquid fuels, which is critical for the widespread deployment of proton exchange membrane (PEM) fuel cells. Current fuel-to-hydrogen conversion technologies involves cumbersome sequences of independent steps, adding undesirable weight, volume, and complexity. We are evaluating the feasibility of a reaction and separation device for converting fuels into high purity hydrogen in a single step. The concept involves a membrane reactor in which hydrogen generation through fuel reforming and selective hydrogen separation are carried out simultaneously. Membrane synthesis, membrane reactor operation, and mathematical modeling are being carried out to evaluate the potential of the concept.

NOx Reduction in Lean Burn Engine Exhaust

We are investigating the catalytic reduction of NOx to nitrogen in the oxidizing atmosphere of lean burn and diesel vehicles. One approach involves the use of an adsorptive reactor in which the NOx is trapped as a nitrite/nitrate on an rare earth oxide and then reduced by the intermittent feed of a reductant. This is a complex system involving the abatement of a key pollutant contained in a time-varying feed utilizing a periodic catalytic process. The challenge is to achieve high NOx conversion with minimal fuel penalty while sustaining long catalyst life. We are carrying out bench-scale reactor and transient kinetics studies, microkinetic mechanisticbased modeling, and reactor modeling and simulations to determine optimal reactor designs, catalyst formulations, and operating strategies.

Integrated Catalytic Filtration Devices for Diesel Exhaust Abatement

In response to aggressive new emission standards, we are developing new technology for reducing particulates and NOx in the net-oxidizing exhaust of lean burn gasoline and diesel vehicles. One concept involves a transient-operated device with particulate filtration, NOx adsorptive storage, and NOx catalytic reduction to nitrogen. Our research involves the synthesis and evaluation of sorbents and catalysts, design and testing of devices, and optimization of the operating scheme. Transient catalytic studies are carried out to elucidate the capture and release of NOx, and the subsequent NOx reduction. We are investigating the use of diesel fuel as both a NOx desorption agent and chemical reductant, as well as simultaneous NOx release and soot oxidation.

Multiphase Selective Oxidation of Hydrocarbons

Selective oxidations of liquid hydrocarbons are particularly challenging due to exothermicity, flammability hazards, complex chemistry and multiphase contacting issues. Environmental and economic factors are increasing the need for higher oxygenate selectivity, improved reactor productivity and modularity, as well as lower investment and cost of manufacture. We are interested in elucidating the interactions of the free radical chemistry and transport phenomena, and in developing operating schemes that optimize the contacting of hydrocarbon and oxygen.

Schematic comparing synthesis of encapsulated Pd membrane with conventional toplayer membrane

Awards & Honors: 

2014: Elected Fellow, American Institute of Chemical Engineers

2012-Present: Editor-in-Chief, AIChE Journal

2013: Esther Farfel Award (top honor to university faculty member), University of Houston

2013: Excellence for Research & Scholarship, Professor Level, University of Houston

2013: Honorary Professor of Chemical Engineering, Tianjin University, Dept of Chemical Engin

2013: Pei Yang University Lectureship, Tianjin University

2010–Present: Member, Industrial Engineering Chemistry Research Editorial Board

2010: Honda Initiation Grant Award, Honda Research Institute, “Enhancing Liquid Fuel Yield During Algae Pyrolysis in Structured Catalytic Reactors, “ (5 awarded out of 261) (2010).

2010: Fluor-Daniel Faculty Excellence Award, Cullen College of Engineering

2010: Outstanding Teaching Award, Cullen College of Engineering (2010).

2010: Abraham Dukler Distinguished Faculty Award, University of Houston, Engineering Alumni Association (2009).

2009-Present: Member, AIChE Chemical Technology Operating Council

2009-Present: Member, AIChE Journal Consulting Editor

2008: ACS Fuel Division Richard A. Glenn Award for the Best Paper presented at ACS 2007 National Meeting in Division of Fuel Chemistry (first out of 285 papers); Paper: “Hydrogen Generation and Purification in Pd Nanopore Hollow Fiber Membrane Reactor,” Authors: M. P. Harold and S. H. Israni

2008: Senior Faculty Research Excellence Award, Cullen College of Engineering, University of Houston

2007: Best Applied Paper Award – Southwest Section of AIChE: Lattner, J.R., and M.P. Harold, “Autothermal Reforming of Methanol: Experiments and Modeling, Catalysis Today, 120, 78-89 (2007).

2005–2008: Chair, AIChE Publication Committee

1999: Best Applied Paper award, Southwest Section of AIChE

1999: Chair, Catalysis and Reaction Engineering Division of AIChE

1999: Invited Participant in National Academy of Engineerin “Frontiers of Engineering Symposium”

1997–2000: Research Management, DuPont Company

1991: Visiting Research Fellow, University of Twente, The Netherlands

1990: Outstanding Junior Faculty Award, College of Engineering, University of Massachusetts

Selected Publications

  1. Dhillon, P.S., M.P. Harold, A. Kumar, D. Wang, and S. Joshi,

    Optimizing the Dual-Layer Pt/Al2O3 + Cu/SSZ-13 Washcoated Monolith: Selective Oxidation of NH3 to N2,” Catal. Today, in press

    , 2020
  2. Ghosh, R., M.P. Harold, and D. Wang ,

    Core-Shell Catalyst Pt/Al2O3@Cu/ZSM-5 Catalyst for Selective NH3 Oxidation,” ACS Catalysis, in press

    , 2020
  3. Gupta, A., S. Kang, and M.P. Harold,

    NOx Uptake and Release on Pd/SSZ-13: Impact of Feed Composition and Temperature,” Catal. Today, in press

    , 2020
  4. Malamis, S. and M.P. Harold,

    Optimizing the Lean Hydrocarbon NOx Trap: Sequential and Dual-Layer Configurations,” Catal. Today, in press

    , 2020
  5. Zhou, Z.., M.P. Harold and D.Luss,

    Enhanced NO, CO and C3H6 Conversion on Pt/Pd Catalysts:
    • Impact of Oxygen Storage Material and Catalyst Architecture,” Catal. Today, press

    , 2020
  6. Dhillon, P.S., M.P. Harold, A. Kumar, D. Wang, and S. Joshi,

    Enhanced Transport in Washcoated Monoliths: Application to Selective Lean NOx Reduction and Ammonia Oxidation,” Chem. Eng. Journal, 377, 119734

    , 2019
  7. Dhillon, P.S., M.P. Harold, A. Kumar, D. Wang, and S. Joshi,

    Modeling and Analysis of Transport and Reaction in Washcoated Monoliths: Cu-SSZ-13 SCR and Dual-Layer Cu-SSZ-13 + Pt/Al2O3 ASC,” Reaction Chemistry and Engineering, 4, 1103-1115

    , 2019
  8. Dhillon, P.S., M.P. Harold, A. Kumar, D. Wang, and S. Joshi,

    Hydrothermal Aging of Pt/Al2O3 Monolith: Washcoat Morphology Degradation Effects Studied Using Ammonia and Propylene Oxidation,” Catalysis Today, 320, 20-29

    , 2019
  9. Lang, W. and M.P. Harold,

    Rate Inhibition and Enhancement on Ceria-Promoted Pd Monolith Catalysts: Oxidation of Acetylene, Ethylene and Propylene and Their Mixtures,” Ind. Eng. Chem. Res., 58, 6350-6363

    , 2019
  10. Li, M., S. Malamis, W.S. Epling, and M.P. Harold,

    Steady State and Lean-Rich Cycling Characterization of a Three-Way NOx Storage Catalyst: Modeling,” Appl. Catal. B. Environmental, 242, 469-484

    , 2019
  11. Malamis, S., M. Ambast, M.P. Harold, and W.S. Epling ,

    Coupled NO and C3H6 Trapping, Release and Conversion on Pd-BEA,” Ind. Eng. Chem. Res, 58, 22912-22923

    , 2019
  12. Peng, P.-Y., M.P. Harold, and D. Luss,

    Sustained Concentration and Temperature Oscillations in a Diesel Oxidation Catalyst: Predictive Model,” Chem. Eng. Journal, 355, 661-670

    , 2019
  13. Ting, W.-L., M. Li, M.P. Harold, and V. Balakotaiah,

    Fast Cycling NOx Storage and Reduction: Modeling and Analysis of Reaction Pathways, Transport and Reductant Effects,” Chem. Eng. Journal, 370, 1493-1510

    , 2019
  14. Zhou, Z., M.P. Harold, and D. Luss,

    Comparison of Pt-BaO/Al2O3 and Pt-CeO2/Al2O3 for Fast Cycling NOx Storage and Reduction,” Appl. Catal. B. Environ., 255, 117742

    , 2019
  15. Aseem and M. P. Harold,

    C2 Yield Enhancement During Oxidative Coupling of Methane in a Nonpermselective Porous Membrane Reactor,” Chem. Eng. Science, 175, 199-207

    , 2018
  16. Aseem, M.T. Conato, G. Goodwin, J. D. Rimer and M. P. Harold,

    Oxidative Coupling of Methane over Mixed Metal Oxide Catalysts: Steady State Multiplicity and Catalyst Durability Oxides,” Chem. Eng. Journal, 331, 132-143

    , 2018
  17. Malamis, S., M. Li, W.S. Epling, and M.P. Harold,

    Steady State and Lean-Rich Cycling Characterization of a Three-Way NOx Storage Catalyst: Experiments,” Appl. Catal. B. Environmental, 237, 588-602

    , 2018
  18. Peng, P.-Y., H. Nguyen, M.P. Harold, and D. Luss,

    Sustained Concentration and Temperature Oscillations in a Diesel Oxidation Catalyst,” Chem. Eng. Journal, 336, 531-543

    , 2018
  19. Peng, P.-Y., M.P. Harold, and D. Luss,

    Coupled Hydrocarbon Desorption in Zeolite Beta,” Ind. Eng. Chem. Res., 57, 17516–17521

    , 2018
  20. Tanwar, M., D. Bhatia, and M.P. Harold,

    Analysis of inter-particle dilution effects in a catalytic packed bed reactor,” Chem. Eng. Journal, 337, Pages 750-754

    , 2018
  21. Ting, W.-L., M. Li, M.P. Harold, and V. Balakotaiah,

    Elucidating the Mechanism of Fast Cycling NOx Storage and Reduction Using C3H6 and H2 as Reductants,” Chem. Eng. Sci., 189, 413-421

    , 2018
  22. Ting, W.-L., M. Li, M.P. Harold, and V. Balakotaiah,

    Fast Cycling NOx Storage and Reduction: Identification of an Adsorbed Intermediate Pathway,” Catalysis Letters, 148, 1951–1964

    , 2018
  23. Ting, W.-L., V. Balakotaiah, and M.P. Harold,

    NOx Storage and Reduction: Effects of Pt Dispersion, Reductant Type, and Cycle Timing,” in NOx Trap Catalysts and Technologies: Fundamentals and Industrial Applications, L. Lietti and L. Castoldi, (Eds.) Royal Society of Chemistry

    , 2018
  24. Zhou, Z., M.P. Harold, and D. Luss,

    NOx Reduction on Ceria: Impact of Lean-Rich Cycling,” Appl. Catal. B. Environmental, 240, 79-91

    , 2018
  25. Bugosh, G., and M.P. Harold,

    “Impact of Zeolite Beta on Hydrocarbon Trapping and Light-off Behavior of Pt/Pd/Al2O3 Monolith Catalysts,” Emission Control Science and Technology, 3, 123-134

    , 2017
  26. Lang, W., P. Laing, Y. Cheng, C. Hubbard, and M.P. Harold,

    “Co-Oxidation of CO and Propylene on Pd/CeO2-ZrO2/Al2O3 Monolith Catalysts: A Light-off, Kinetics, and Mechanistic Study,” Appl. Catal. B. Environ., 218, 430-442

    , 2017
  27. Nguyen, H., M.P. Harold, and D. Luss,

    “Assessing Intrusion by the Capillary During Spatially Resolved Mass Spectrometry Measurement,” Chem. Eng. Journal, 307, 845-859

    , 2017
  28. Ting, W.-L., M. Li, M.P. Harold, and V. Balakotaiah,

    “Fast Cycling in a Non-isothermal Monolithic Lean NOx Trap Using H2 as Reductant: Experiments and Modeling,” Chem. Eng. J., 326, 419-435

    , 2017
  29. Li, M., V. Easterling, and M.P. Harold,

    “Towards Optimal Operation of Sequential NOx Storage and Reduction and Selective Catalytic Reduction,” Applied Catalysis B. Environmental, 184, 364-380

    , 2016
  30. Li, M., V. Easterling, and M.P. Harold,

    "Spatio-temporal Features of Lean NOx Reduction the Sequential NOx Storage and Reduction and Selective Catalytic Reduction Reactor System,” Catalysis Today, 267, 177-191

    , 2016
  31. Shrestha, S., M.P. Harold, K. Kamasamudram, A. Kumar, L.Olsson, and K. Leistner,

    “Selective Oxidation of Ammonia to Nitrogen on Bi-Functional Cu-SSZ-13 and Pt/Al2O3 Monolith Catalyst, Catalysis Today, 267, 130-144

    , 2016
  32. Zheng Y., M.P. Harold, and D. Luss,

    “Rapid Propylene Pulsing for Enhanced Low Temperature NOx Conversion on Combined LNT-SCR Catalysts,” Catalysis Today, 267, 192-201

    , 2016
  33. Zheng Y., M.P. Harold, and D. Luss,

    “Effects of CO, H2, and C3H6 on Cu-SSZ-13 Catalyzed NH3-SCR,” Catalysis Today, 264, 44-54

    , 2016
  34. Bugosh, G., V. Easterling, and M.P. Harold,

    “Anomalous Steady-State and Spatio-Temporal Features of Methane Oxidation on Pt/Pd/Al2O3 Monolith Spanning Lean and Rich Conditions,” Applied Catalysis B. Environmental, 165, 68-78

    , 2015
  35. Nguyen, H., M.P. Harold, and D. Luss,

    “Spatiotemporal Behavior of Pt/Rh/CeO2/BaO Catalyst During Lean-Rich Cycling,” Chem. Eng. Journal, 262, 464-477

    , 2015
  36. Raj, R. M.P. Harold and V. Balakotaiah,

    “Steady-state and Dynamic Hysteresis Effects During Lean Co-oxidation of CO and C3H6 over Pt/Al2O3 Monolithic Catalyst,” Chem. Eng. J., 281, 322-333

    , 2015
  37. Shakya, B., M.P. Harold, and V. Balakotaiah,

    “Simulations and Optimization of Combined Fe- and Cu-Zeolite SCR Monolith Catalysts,” Chem. Eng. Journal, 278, 374-384

    , 2015
  38. Shrestha, S., M.P. Harold, and K. Kamasamudram,

    “Experimental and Modeling Study of Selective Ammonia Oxidation on Multi-Functional Washcoated Monolith Catalysts,” Chem. Eng. Journal, 278, 24-35

    , 2015
  39. Zheng, Y., M. Li, M.P. Harold, and D. Luss,

    “Enhanced Low-temperature NOx Conversion by High-Frequency Hydrocarbon Pulsing on a Dual Layer LNT-SCR Catalyst,” SAE Journal, 2015-01-0984

    , 2015
  40. Perng, C., V. Easterling, and M.P. Harold,

    “Fast Lean-Rich Cycling for Enhanced NOx Conversion on Storage and Reduction Catalysts,” Catalysis Today, 231, 125-134

    , 2014
  41. Metkar, P.S., M.P. Harold, and V. Balakotaiah,

    “Kinetic Model of NH3-Based Selective Catalytic Reduction of NOx on Fe-ZSM-5 and Cu-Chabazite, and Dual Layer Fe/Cu Zeolitic Monolithic Catalysts,” Chem. Engin. Sci., 87, 51–66

    , 2013
  42. Shrestha, S., M.P. Harold, K. Kamasamudram, and A. Yezerets,

    “Ammonia Oxidation on Structured Composite Catalysts,” Topics in Catalysis, DOI 10.1007/s11244-013-9949-9

    , 2013
  43. Campanella, A., and M.P. Harold,

    “Pyrolysis of Microalgae and Duckweed in a Falling Solids Reactor:  Effects of Process Variables and Zeolite Catalysts,” J. Biomass and Bioenergy, 46, 218-232

    , 2012
  44. Bugosh, G. S.; Muncrief, R. L.; Harold, M. P.,

    Emission Analysis of Alternative Diesel Fuels Using a Compression Ignition Benchtop Engine Generator. Energy & Fuels 2011, 25 (10), 4704-4712.

    , 2011
  45. Israni, S. H.; Harold, M. P.,

    Methanol steam reforming in single-fiber packed bed Pd-Ag membrane reactor: Experiments and modeling. Journal of Membrane Science 2011, 369 (1-2), 375-387.

    , 2011
  46. Joshi, S. Y.; Ren, Y. J.; Harold, M. P.; Balakotaiah, V.,

    Determination of kinetics and controlling regimes for H(2) oxidation on Pt/Al(2)O(3) monolithic catalyst using high space velocity experiments. Applied Catalysis B-Environmental 2011, 102 (3-4), 484-495.

    , 2011
  47. Kumar, A.; Zheng, X. L.; Harold, M. P.; Balakotaiah, V.,

    Microkinetic modeling of the NO + H(2) system on Pt/Al(2)O(3) catalyst using temporal analysis of products. Journal of Catalysis 2011, 279 (1), 12-26.

    , 2011
  48. Liu, Y.; Harold, M. P.; Luss, D.,

    Spatio-temporal features of periodic oxidation of H(2) and CO on Pt/CeO(2)/Al(2)O(3). Applied Catalysis a-General 2011, 397 (1-2), 35-45.

    , 2011
  49. Meisami-Azad, M.; Mohammadpour, J.; Grigoriadis, K. M.; Harold, M. P.; Franchek, M. A.,

    Ieee, PCA-based Linear Parameter Varying Control of SCR Aftertreatment Systems. In 2011 American Control Conference, Ieee: New York, 2011.

    , 2011
  50. Metkar, P. S.; Balakotaiah, V.; Harold, M. P.,

    Experimental study of mass transfer limitations in Fe- and Cu-zeolite-based NH(3)-SCR monolithic catalysts. Chemical Engineering Science 2011, 66 (21), 5192-5203.

    , 2011
  51. Metkar, P. S.; Salazar, N.; Muncrief, R.; Balakotaiah, V.; Harold, M. P.,

    Selective catalytic reduction of NO with NH(3) on iron zeolite monolithic catalysts: Steady-state and transient kinetics. Applied Catalysis B-Environmental 2011, 104 (1-2), 110-126.

    , 2011
  52. Ren, Y. J.; Harold, M. P.,

    NO(x) Storage and Reduction with H(2) on Pt/Rh/BaO/CeO(2): Effects of Rh and CeO(2) in the Absence and Presence of CO(2) and H(2)O. Acs Catalysis 2011, 1 (8), 969-988.

    , 2011
  53. Xu, J.; Harold, M. P.; Balakotaiah, V.,

    Modeling the effects of Pt loading on NOx storage on Pt/BaO/Al(2)O(3) catalysts. Applied Catalysis B-Environmental 2011, 104 (3-4), 305-315.

    , 2011
  54. An, H., R. Muncrief, M.P. Harold, and H. Ismail,

    “Fast Screening of Alternative Diesel Fuels and Additives for NOx Reduction,” SAE Journal2010-01-1293

    , 2010
  55. Bhatia, D., R.D. Clayton, V. Balakotaiah, and M.P. Harold,

    “Modeling the Effect of Pt Dispersion and Temperature During Anaerobic Regeneration of a Lean NOx Trap Catalyst,”Catalysis Today151, 314–329

    , 2010
  56. Israni, S., and M.P. Harold,

    “Methanol steam reforming in Pd-based membrane reactors: Effects of reaction system species on hydrogen flux through a Pd-Ag membrane,” I&EC Research, accepted for publication, 10.1021/ie1005178

    , 2010
  57. Joshi, S., M.P. Harold, and V. Balakotaiah,

    “Overall Mass Transfer Coefficients and Controlling Regimes in Catalytic Monoliths,” Chem. Eng. Sci.65, 1729-1747

    , 2010
  58. Kumar, A., M.P. Harold, and V. Balakotaiah,

    “Estimation of Stored NOx Diffusion Coefficient in NOx Storage and Reduction,” I&EC Research, 10.1021/ie100504q

    , 2010
  59. Kumar, A., M.P. Harold, and V. Balakotaiah,

    “Isotopic TAP Studies of NO Decomposition and Reduction on Pt/BaO/Al2O3 Catalysts,” J. Catalysis, doi:10.1016/j.jcat.2009.12.018

    , 2010
  60. Bhatia, D., R.D. Clayton, M.P. Harold, and V. Balakotaiah,

    “A Global Kinetic Model for NOx Storage and Reduction on Pt/BaO/Al2O3 Monolithic Catalysts,” Catalysis Today147S, S250-S256

    , 2009
  61. Bhatia, D., V. Balakotaiah and M.P. Harold,

    “Bifurcation Analysis of CO and H2 Oxidation on Pt/Al2O3 Monolith Reactors.” Chem. Eng. Sci.64, 1544-1558

    , 2009
  62. Bhatia, D., V. Balakotaiah, M.P. Harold, and R. McCabe,

    “Experimental and Kinetic Study of NO Oxidation on Model Pt Catalysts,” J. Catalysis266, 106-119

    , 2009
  63. Clayton, R.D., M.P. Harold, and V. Balakotaiah,

    “Performance Features of Pt/BaO Lean NOx Trap with Hydrogen as Reductant,” AIChE J.55, 687-700

    , 2009
  64. Clayton, R.D.., M.P. Harold, V. Balakotaiah, and C.Z. Wan,

    “Effect of Pt Dispersion on NOx Storage and Reduction in Pt/BaO/Al2O3 Catalyst,” Appl. Catal. B. Environmental90, 662-676

    , 2009
  65. Israni, S.H., B. Nair and M. P. Harold,

    “Hydrogen Generation and Purification in a Composite Pd Hollow Fiber Membrane Reactor: Experiments and Modeling,” Catalysis Today130, 299-311

    , 2009
  66. Joshi, S., M.P. Harold, and V. Balakotaiah,

    “On the Use of External and Internal Mass Transfer Coefficients in the Transient Modeling of Catalytic Monolith Reactors,” Chemical Engineering Science64,  4976 - 4991

    , 2009
  67. Joshi, S., V. Balakotaiah, and M.P. Harold,

    “Low Dimensional Models for Real Time Simulation of Catalytic Monoliths,” AIChE J.55, 1771-1783

    , 2009
  68. Kumar, A., V. Medhekar, M.P. Harold, and V. Balakotaiah,

    “NO Decomposition and Reduction on Pt/Al2O3 Powder and Monolith Catalysts Using the TAP Reactor,” Appl. Catal. B. Environmental90, 642-651

    , 2009
  69. Xu, J., M.P. Harold, and V. Balakotaiah,

    “Microkinetic Modeling of Steady-State NO/H2/O2 on Pt/BaO/Al2O3 Monolith Catalysts,” Appl. Catal. B. Environmental89, 73-86

    , 2009
  70. Clayton, R.D., M.P. Harold, and V. Balakotaiah,

    “NOx Storage and Reduction with H2 on Pt/BaO/Al2O3 Monolith:  Spatio-Temporal Resolution of Product Distribution,” Appl. Catal. B. Environmental84, 616-630

    , 2008
  71. Clayton, R.D., M.P. Harold, and V. Balakotaiah,

    “Selective Catalytic Reduction of NO by H2 in O2 on Pt/BaO/Al2O3 Monolith NOx Storage Catalysts,” Appl. Catal. B. Environmental,81, 161-181

    , 2008
  72. Muncrief, R.L., C.W. Rooks, M.P. Harold, and M. Cruz,

    “Combining Biodiesel and Exhaust Gas Recirculation for Reduction in NOx and Particulate Emissions,” Energy and Fuels22, 1285-1296

    , 2008
  73. Nair, B., and M.P. Harold,

    “Experiments and Modeling of Transport in Composite Pd and Pd/Ag Coated Alumina Hollow Fibers,” J. Membrane Sci.311, 53-67

    , 2008
  74. Xu, J., R.D. Clayton, V. Balakotaiah, and M.P. Harold,

    “Experimental and Microkinetic Modeling of Steady-State NO Reduction by H2 on Pt/BaO/Al¬2O3 Monolith Catalysts,”Appl. Catal. B. Environmental77, 395-408

    , 2008
  75. Lattner, J.R., and M.P. Harold,

    “Autothermal Reforming of Methanol:  Experiments and Modeling,” Catalysis Today120, 78-89

    , 2007
  76. Medhekar, V., V. Balakotaiah, and M.P. Harold,

    “TAP Study of NOx Storage and Reduction on Pt/Al2O3 and Pt/Ba/Al2O3,” Catalysis Today121, 226-236

    , 2007
  77. Nair, B., and M.P. Harold,

    “Pd Encapsulated and Nanopore Hollow Fiber Membranes: Synthesis and Permeation Studies,” J. Membrane Sci.290, 182-195

    , 2007
  78. Nair, B., J. Choi, and M.P. Harold,

    “Electroless Plating and Permeation Features of Pd and Pd-Ag Hollow Fiber Composite Membranes,” J. Membrane Sci.288, 67-84

    , 2007
  79. Sharma, M., R.D. Clayton, M.P. Harold, and V. Balakotaiah,

    “Multiplicity in Lean NOx Traps,” Chem. Engng. Sci., Chem. Engng. Science62, 5176-5181

    , 2007
  80. Kabin, K., P. Khanna, R. Muncrief, V. Medhekar, and M.P. Harold,

    “Monolith and TAP Reactor Studies of NOX Storage on Pt/BaO/Al2O3: Elucidating the Mechanistic Pathways and Roles of Pt,” Catalysis Today114, 72-85

    , 2006
  81. Nair, B., and M.P. Harold,

    “Hydrogen Generation in a Pd Membrane Fuel Processor: Productivity Effects During Methanol Steam Reforming,” Chem. Engng. Science61, 6616-6636

    , 2006
  82. Su, Y., K. Kabin, M.P. Harold, and M.D. Amiridis,

    “Reactor and In-situ FTIR studies of Pt Pt/BaO/Al2O3 and Pd/BaO/Al2O3 NOx Storage and Reduction (NSR) Catalysts,” Appl. Catal. B. Environmental71, 207-215

    , 2006
  83. Theis, J., H.W. Jen, R. McCabe, M. Sharma, V. Balakotaiah, and M.P. Harold,

    “Reductive Elimination as a Mechanism for Purging a Lean NOx Trap,” Society of Automotive Engineers Journal, 2006-01-1067

    , 2006
  84. Lattner, J.R., and M.P. Harold,

    “Comparison of Methanol Based Fuel Processors for PEM Fuel Cell Systems,” Appl. Catalysis B. Environmental56, 149-169

    , 2005
  85. Sharma, M., K. Kabin, M.P. Harold, and V. Balakotaiah,

    “Modeling of NOx Storage and Reduction for Diesel Exhaust Emission Control,” Society of Automotive Engineers Journal, OFL-125

    , 2005
  86. Sharma, M., M.P. Harold, and V. Balakotaiah,

    “Analysis of Periodic Storage and Reduction in Catalytic Monoliths,” Ind. Engng. Chem. Res.44, 6264-6277

    , 2005
  87. Sharma, M., M.P. Harold, and V. Balakotaiah,

    “Analysis of Storage and Reaction Phases for LNT for Diesel Engine Exhaust Treatment,” Society of Automotive Engineers Journal, OFFL-218

    , 2005