Michael P. Harold

Faculty

Dr. Michael P. Harold

Cullen Engineering Professor

Office Location S225, Engineering Building 1

Phone 713-743-4322

Fax 713-743-4323

Email mharold [at] uh.edu

Website http://txcef.egr.uh.edu

Education

Ph.D., Chemical Engineering, University of Houston, (1985)

B.S., Chemical Engineering, Pennsylvania State University, (1980)

Bio

Dr. Michael P. Harold is the Cullen Engineering Professor of the William A. Brookshire Department of Chemical and Biomolecular Engineering at the University of Houston. With expertise in reaction engineering and catalysis, Harold is the author of more than 180 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.

Courses

Unit Operations (CHEE 3462)

Graduate Seminar (CHEE 6111)

Advanced Reactor Engineering (CHEE 6337)

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:

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

Award for Excellence in Applied Catalysis, Southwest Catalysis Society (2019).

Fellow, American Institute of Chemical Engineers (2014).

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 (2013).

Fluor-Daniel Faculty Excellence Award, Cullen College of Engineering (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).

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

Abraham Dukler Distinguished Faculty Award, Univ. of Houston, Engineering Alumni Assoc. (2009).

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

Senior Faculty Research Excellence Award, Cullen College of Engineering, U. of Houston (2008).

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

Selected Publications

Chen, P.W., D. Maiti, L. Grabow, and M.P. Harold, “CH₄ Steam Reforming on Pt+Pd/Al₂O₃ Monolith: Impact of Mn_0.5Fe_2.5O₄ Spinel Addition”, Catalysis Science and Technology, in press, 2022
Karinshak, K., P.W. Chen, R.F. Liu, and M. P. Harold, “Optimizing Feed Modulation for Coupled Methane and NOx Conversion over Pd-Pt/Mn_0.5Fe_2.5O₄/Al₂O₃ Monolith Catalyst,” Appl. Catal. B. Environ., 304, 120607, 2022
Ambast, M., A. and M.P. Harold, “Coupled Uptake and Conversion of C₁₂H₂₆ and NO on Pd/SSZ-13: Experiments and Modeling,” Chem. Eng. J., 423, 129958, 2021
Ambast, M., A. Gupta, B. M. Rahman L. Grabow, and M.P. Harold, “NOx Adsorption with CO and C2H4 on Pd/SSZ-13: Experiments and Modeling,” Appl. Catal. B. Environ., 286, 119871, 2021
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, 360, 426-434, 2021
Ghosh, R., M.P. Harold, and D. Wang, “Selective Oxidation of NH3 in a Pt/Al₂O₃@Cu/ZSM-5 Core-Shell Catalyst: Modeling and Optimization,” Chem. Eng. J., 418, 129065, 2021
Ghosh, R., P.S. Dhillon, M.P. Harold, and D. Wang, “Kinetics of NH₃ Oxidation on Pt/Al₂O₃: Rate Enhancement and NH₃ Inhibition,” Chem. Eng. J., 417, 128273, 2021
Gupta, A., S. Kang, and M.P. Harold, “NOx Uptake and Release on Pd/SSZ-13: Impact of Feed Composition and Temperature,” Catal. Today, 360, 411-425, 2021
Kang, S.B. K. Karinshak, P.W. Chen, S. Golden, and M.P. Harold, “Coupled Methane and NOx Conversion on Pt+Pd/Al₂O₃ Monolith: Conversion Enhancement Through Feed Modulation and Mn_0.5Fe_2.5O₄/Al₂O₃ Spinel Addition,” Catal. Today, 360, 284-293, 2021
Malamis, S. and M.P. Harold, “Optimizing the Lean Hydrocarbon NOx Trap: Sequential and Dual-Layer Configurations,” Catal. Today, 360, 388-400, 2021
Zhou, Z., M.P. Harold and D. Luss, “Dynamic Oxygen Storage Capacity of Ceria-Zirconia and Mn_0.5Fe_2.5O₄ Spinel: Experiments and Modeling,” Ind. Eng. Chem. Res., 60, 18, 6465–648, 2021
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, 360, 375-387, 2021
Ambast, M., K. Karinshak, B. M. Rahman L. Grabow, and M.P. Harold, “Passive NOx Adsorption on Pd/H-ZSM-5: Experiments and Modeling,” Appl. Catal. B. Environ., 269, 118802, 2020
Ghosh, R., T. Le, T. Terlier, J.D. Rimer, M.P. Harold, and D. Wang, “Enhanced Selective Oxidation of Ammonia in a Pt/Al₂O₃@Cu/ZSM-5 Core–Shell Catalyst,” ACS Catalysis, 10, 6, 3604-361, 2020
Karinshak, K. A., P. Lott, O. Deutschmann, and M.P. Harold, “In Situ Activation of Bimetallic Pd-Pt Methane Oxidation Catalysts,” ChemCatChem, 12, 3712 –3720, 2020
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,” Catal. Today, 320, 20-29, 2019
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
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
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
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
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
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
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
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
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
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
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
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
Peng, P.-Y., M.P. Harold, and D. Luss, Coupled Hydrocarbon Desorption in Zeolite Beta,” Ind. Eng. Chem. Res., 57, 17516–17521, 2018
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
An, H., R. Muncrief, M.P. Harold, and H. Ismail, “Fast Screening of Alternative Diesel Fuels and Additives for NOx Reduction,” SAE Journal, 2010-01-1293, 2010
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 Today, 151, 314–329, 2010
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
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
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
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

More Publications

Selected Publications

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 Today, 147S, S250-S256, 2009
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
Bhatia, D., V. Balakotaiah, M.P. Harold, and R. McCabe, “Experimental and Kinetic Study of NO Oxidation on Model Pt Catalysts,” J. Catalysis, 266, 106-119, 2009
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
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. Environmental, 90, 662-676, 2009
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 Today, 130, 299-311, 2009
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 Science, 64, 4976 - 4991, 2009
Joshi, S., V. Balakotaiah, and M.P. Harold, “Low Dimensional Models for Real Time Simulation of Catalytic Monoliths,” AIChE J., 55, 1771-1783, 2009
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. Environmental, 90, 642-651, 2009
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. Environmental, 89, 73-86, 2009
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
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. Environmental, 84, 616-630, 2008
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 Fuels, 22, 1285-1296, 2008
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
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. Environmental, 77, 395-408, 2008
Lattner, J.R., and M.P. Harold, “Autothermal Reforming of Methanol: Experiments and Modeling,” Catalysis Today, 120, 78-89, 2007
Medhekar, V., V. Balakotaiah, and M.P. Harold, “TAP Study of NOx Storage and Reduction on Pt/Al2O3 and Pt/Ba/Al2O3,” Catalysis Today, 121, 226-236, 2007
Nair, B., and M.P. Harold, “Pd Encapsulated and Nanopore Hollow Fiber Membranes: Synthesis and Permeation Studies,” J. Membrane Sci., 290, 182-195, 2007
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
Sharma, M., R.D. Clayton, M.P. Harold, and V. Balakotaiah, “Multiplicity in Lean NOx Traps,” Chem. Engng. Sci., Chem. Engng. Science, 62, 5176-5181, 2007
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 Today, 114, 72-85, 2006
Nair, B., and M.P. Harold, “Hydrogen Generation in a Pd Membrane Fuel Processor: Productivity Effects During Methanol Steam Reforming,” Chem. Engng. Science, 61, 6616-6636, 2006
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. Environmental, 71, 207-215, 2006
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
Lattner, J.R., and M.P. Harold, “Comparison of Methanol Based Fuel Processors for PEM Fuel Cell Systems,” Appl. Catalysis B. Environmental, 56, 149-169, 2005
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
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
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
Bhattacharya, M. M.P. Harold, and V. Balakotaiah, “Shape Normalization for Catalytic Monoliths,” Chem. Engng. Sci., 59, 3737-3766, 2004
Bhattacharya, M. M.P. Harold, and V. Balakotaiah, “Mass Transfer Coefficients in Washcoated Monoliths,” AIChE J., 50, 2939-2955, 2004
Bhattacharya, M., M.P. Harold, and V. Balakotaiah, “Low Dimensional Models for Stirred Tank Reactors,” Chem. Engng. Sci., 59, 5587-5596, 2004
Kabin, K., R. Muncrief, and M.P. Harold, “NOx Storage and Reduction in a Pt/BaO/Alumina Washcoated Monolith Catalyst,” Catalysis Today, 96, 79-89, 2004
Kabin, K., R. Muncrief, M.P. Harold, and Y. Li, “Dynamics of Storage and Reaction in a Monolith Reactor: Lean NOx Reduction,” Chem. Engng. Sci., 59, 5319-5327, 2004
Lattner, J.R., and M.P. Harold, “Comparison of Conventional and Membrane Reactor Fuel Processors for Hydrocarbon-Based PEM Fuel Cell Systems,” Inter. J. of Hydrogen Energy,29, 393-417, 2004
Muncrief, R., K. Kabin, and M.P. Harold, “NOx Storage and Reduction With Propylene on Pt/BaO/Alumina,” AIChE J., 50, 2526-2540, 2004
Muncrief, R., P. Khanna, K. Kabin, and M.P. Harold, “Mechanistic and Kinetic Studies of NOx Storage and Reduction on Pt/BaO/Al2O3,” Catal. Today, 98, 393-402, 2004
Harold, M.P., B. Nair, and G. Kolios, “Hydrogen Generation in a Pd Membrane Fuel Processor: Assessment of Methanol-Based Reaction Systems,” Chemical Engineering Science, 58, 2551-2571, 2003