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Abstract:
Precious elements such as platinum work well as catalysts in chemical reactions, but require large amounts of metal and can be expensive. However, computational modeling below the nanoscale level may allow researchers to design more efficient and affordable catalysts from gold. These novel computer simulations to better explore how catalysts function at the nanoscale, led by researchers at the University of Pittsburgh Swanson School of Engineering, was featured as the cover article in the January issue of "Catalysis Science & Technology," published by the Royal Society of Chemistry.

The gold standard

Pittsburgh, PA | Posted on December 9th, 2014

"Catalysis at the sub-nanoscale: complex CO oxidation chemistry on a few Au atoms" (DOI: 10.1039/C4CY01295J) was led by principal investigator Giannis Mpourmpakis, assistant professor of Chemical and Petroleum Engineering at the Swanson School. Co-authors were Michail Stamatakis, lecturer of Chemical Engineering at the University College London (UK), Dionisios Vlachos, professor of Chemical and Biomolecular engineering at the University of Delaware, and student researchers Natalie Austin and Nima Nikbin.

"Gold has been widely used as jewelry since ancient times because it does not corrode and keeps its bright yellow color," Dr. Mpourmpakis said. "However, subnanoscale catalysts consisting of only a few gold atoms show very rich and difficult to understand chemistry and finding the right composition requires trial and error experimentation in the lab. For example, a catalyst that consists of eight gold atoms can be extremely active for oxidation reactions, whereas the catalyst of six gold atoms is not active at all. This behavior has puzzled many researchers over the last decade."

According to Dr. Mpourmpakis, these new computational modeling methods reduce the time and expense of lab experimentation and allow for more precise predictions of how to design a better catalyst using minute amount of metal to reduce its cost. For example, a typical reaction on platinum catalysts would require thousands of atoms of rare metal, while the same reaction utilizing gold might require fewer than ten. The greatest potential impact for this process would be in energy-and-environment-related fields, such as the catalytic reactions that convert carbon monoxide to carbon dioxide in automobile exhaust and the production of hydrogen using water and carbon monoxide.

Dr. Stamatakis highlighted that "our study unravels a high degree of complexity in the catalytic behavior of small gold clusters. We were very excited to reveal many competing physicochemical phenomena on the catalyst that give rise to the activity of specific catalyst sizes."

This and other computational research undertaken by Dr. Mpourmpakis endeavors to build a more efficient modeling process to accelerate catalyst design while improving efficiency and reducing costs.

"In lab experiments you can't see in detail the physical and chemical properties that affect the catalytic activity, but with computations you can virtually "see" them and reduce experimental trial and error," he explained. "By designing an effective catalyst with only a few atoms of metal, we can create a more sustainable method to improve chemical reactions across many industries, especially throughout the energy sector."

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About University of Pittsburgh
The Swanson School's Department of Chemical and Petroleum Engineering serves undergraduate and graduate engineering students, the University and industry, through education, research, and participation in professional organizations and regional/national initiatives. The Department maintains a tradition of excellence in education and research, evidenced by recent national awards including numerous NSF CAREER Awards, a Beckman Young Investigator Award, an NIH Director's New Innovator Award, and the DOE Hydrogen Program R&D Award, among others. Active areas of research in the Department include Biological and Biomedical Systems; Energy and Sustainability; and Materials Modeling and Design.

The faculty holds a record of success in obtaining research funding such that the Department ranks within the top 25 U.S. ChE departments for Federal R&D spending in recent years with annual research expenditures exceeding $7 million. The vibrant research culture within the Department includes active collaboration with the University of Pittsburgh Medical Center, the Center for Simulation and Modeling, the McGowan Institute for Regenerative Medicine, the Mascaro Center for Sustainable Innovation, the Petersen Institute of NanoScience and Engineering and the U.S. DOE-affiliated Institute for Advanced Energy Solutions.

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