Michael P. Harold
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View article: Single atom alloys 2.0: Exploiting undercoordination for stronger dissociative CH4 chemisorption
Single atom alloys 2.0: Exploiting undercoordination for stronger dissociative CH4 chemisorption Open
Efficient C-H bond activation is key to low temperature methane oxidation in catalytic converters of natural gas-powered vehicles. Through ab initio calculations, we investigate the potential enhancement of dissociative CH₄ chemisorption o…
View article: Tailored Platinum Group Metal/Spinel Oxide Catalysts for Dynamically Enhanced Methane Oxidation
Tailored Platinum Group Metal/Spinel Oxide Catalysts for Dynamically Enhanced Methane Oxidation Open
A combined experimental and molecular modeling study identifies a family of spinel oxides that in combination with PGM (platinum group metals) provide enhanced methane oxidation activity. With a reduction in greenhouse gas (GHG) emissions …
View article: Electrified Catalysts for Endothermic Chemical Processes: Materials Needs, Advances, and Challenges
Electrified Catalysts for Endothermic Chemical Processes: Materials Needs, Advances, and Challenges Open
Large-scale endothermic chemical processes, as currently practiced, employ tubular reactors that are heated externally through the combustion of fossil fuels, and are highly carbon-intensive. Joule-heated reactors in which electric current…
View article: Reduced Precious Metal Catalysts for CH<sub>4</sub> and NO<sub>x</sub> Emission Control of Natural Gas Vehicles
Reduced Precious Metal Catalysts for CH<sub>4</sub> and NO<sub>x</sub> Emission Control of Natural Gas Vehicles Open
The abundant domestic natural gas resources coupled with the desire for clean air and reduced greenhouse gas emissions motivates the accelerated development of natural gas vehicles (NGVs) and engine. Methane (CH4), a potent greenhouse gas,…
View article: Decarbonization of the Chemical Industry through Electrification: Barriers and Opportunities
Decarbonization of the Chemical Industry through Electrification: Barriers and Opportunities Open
The chemical industry is a major source of economic productivity and employment globally and among the top 3 industrial sources of greenhouse gas (GHG) emissions, along with steel and cement. As global demand for chemical products continue…
View article: NO<sub><i>x</i></sub> and Hydrocarbon Trapping and Conversion in a Sequential Three-Zone Monolith: Spatiotemporal Features
NO<sub><i>x</i></sub> and Hydrocarbon Trapping and Conversion in a Sequential Three-Zone Monolith: Spatiotemporal Features Open
The spatiotemporal features of the multifunctional monolithic lean hydrocarbon NOx trap (LHCNT), for eliminating NOx (x = 1 and 2) and ethylene (C2H4), are examined using spatially resolved mass spectrometry (SpaciMS), spanning the sequent…
View article: Design and Optimization of Structured Multi-Functional Trapping Catalysts for Conversion of Hydrocarbons and NOx from Diesel and Advanced Combustion Engines
Design and Optimization of Structured Multi-Functional Trapping Catalysts for Conversion of Hydrocarbons and NOx from Diesel and Advanced Combustion Engines Open
Oxides of nitrogen in the form of nitric oxide (NO) and nitrogen dioxide (NO2) commonly referred to as NOx, is one of the two chemical precursors that lead to ground-level ozone, a ubiquitous air pollutant in urban areas. A major source of…
View article: Design and Optimization of Structured Multi-Functional Trapping Catalysts for Conversion of Hydrocarbons and NOx from Diesel and Advanced Combustion Engines
Design and Optimization of Structured Multi-Functional Trapping Catalysts for Conversion of Hydrocarbons and NOx from Diesel and Advanced Combustion Engines Open
Oxides of nitrogen in the form of nitric oxide (NO) and nitrogen dioxide (NO2) commonly referred to as NOx, is one of the two chemical precursors that lead to ground-level ozone, a ubiquitous air pollutant in urban areas. A major source of…
View article: CH<sub>4</sub>steam reforming on Pt + Pd/Al<sub>2</sub>O<sub>3</sub>monolith: impact of Mn<sub>0.5</sub>Fe<sub>2.5</sub>O<sub>4</sub>spinel addition
CH<sub>4</sub>steam reforming on Pt + Pd/Al<sub>2</sub>O<sub>3</sub>monolith: impact of Mn<sub>0.5</sub>Fe<sub>2.5</sub>O<sub>4</sub>spinel addition Open
Zoned catalyst provides CH 4 oxidation enhancement afforded by spinel under oxidation regime and mitigates the detrimental base metal species migration from spinel layer to PGM layer under reforming regime.
View article: Dynamic Oxygen Storage Capacity of Ceria-Zirconia and Mn<sub>0.5</sub>Fe<sub>2.5</sub>O<sub>4</sub> Spinel: Experiments and Modeling
Dynamic Oxygen Storage Capacity of Ceria-Zirconia and Mn<sub>0.5</sub>Fe<sub>2.5</sub>O<sub>4</sub> Spinel: Experiments and Modeling Open
A combined experimental and modeling study of dynamic oxygen storage capacity (DOSC) of ceria-zirconia (CZO) and Al2O3-supported Mn0.5Fe2.5O4 (MFO) spinel using CO and H2 as reductants is conducted to provide understanding of the redox per…
View article: Editorial for AIChE Journal 2020 Futures Issue
Editorial for AIChE Journal 2020 Futures Issue Open
Editorial – The third “Futures” issueThis month’s volume of AIChE Journal is the third “Futures” issue. I think now we’ve established a tradition. This is my favorite issue each year.Each year we invite a group of early career researchers …
View article: Selection for increased cranial capacity in small mammals during a century of urbanization
Selection for increased cranial capacity in small mammals during a century of urbanization Open
Urbanization is a selective force that is known to drive changes in the population dynamics of wildlife. How animals adapt to changing environmental conditions is crucial to their survival in these environments. Relative brain size, or cra…
View article: <i>In situ</i> Activation of Bimetallic Pd−Pt Methane Oxidation Catalysts
<i>In situ</i> Activation of Bimetallic Pd−Pt Methane Oxidation Catalysts Open
This study investigates possible pathways to reduce water inhibition over Pd−Pt methane oxidation catalysts supported on alumina and a ceria‐zirconia mixed oxide under conditions typical for lean burn gas engines. Spatially resolved concen…
View article: Coupled NO and C<sub>3</sub>H<sub>6</sub> Trapping, Release and Conversion on Pd/BEA: Evaluation of the Lean Hydrocarbon NO<sub><i>x</i></sub> Trap
Coupled NO and C<sub>3</sub>H<sub>6</sub> Trapping, Release and Conversion on Pd/BEA: Evaluation of the Lean Hydrocarbon NO<sub><i>x</i></sub> Trap Open
Automotive emission control catalysts are not effective in eliminating CO, hydrocarbons (HCs), and NOx during engine cold start (below 200 °C). In this study, the effectiveness of coupled low-temperature NOx and C3H6 trapping and conversio…