Faculty


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.
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.
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 Mn0.5Fe2.5O4 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/Mn0.5Fe2.5O4/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 Mn0.5Fe2.5O4/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 Mn0.5Fe2.5O4 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
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