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Metal Nanoparticles Hold the Secret to Quick CO2 Conversion

By Utrecht University | January 29, 2018

CO2 and sustainably produced hydrogen have the potential to serve as an ingredient for converting electrical power generated by windmills or solar panels into a gas fuel. This “power-to-gas” concept can solve two problems at once: it reduces CO2 emissions while creating more flexible applications of sustainable energy. However, profitable conversion of CO2 would require an extremely effective catalyst. Researchers from Utrecht University have found a way to study the conversion process in detail and to determine the perfect size for the catalytic nickel nanoparticles. The researchers have published their results in Nature Catalysis.

Lead author Charlotte Vogt explains: “When we make metal nanoparticles smaller and smaller, they start to show very different properties to what we expect and understand from classical physics and chemistry.”

Together with colleagues Florian Meirer and Bert Weckhuysen from Utrecht University and researchers from chemical company BASF, Vogt found that nickel particles exhibit optimal catalytic activity at a size of 2.5 nanometers, about 40,000 times smaller than a human hair. The researchers also found that a specific architecture of these tiny nickel particles facilitates the activation of CO2.

In order to understand how these nickel nanoparticles behave during the conversion of CO2, the researchers studied the catalysts in action. In cooperation with scientists at the Swiss Light Source in Switzerland, they developed an ultra-fast measuring tool to study their catalysts at work. This allowed the researchers to unlock the mechanism behind the CO2 conversion process in great detail. Thus, they identified both formate and adsorbed carbon monoxide as reaction intermediates.

The project involved a close collaboration between researchers at BASF, Utrecht University, Lehigh University in the U.S., and the synchrotron facilities at the Paul Scherrer Institute in Switzerland.

“This collaboration has brought us a better understanding of how these solid catalysts work, putting us in the position to unlock the true potential of small metal nanoparticles for CO2 catalysis,” says Bert Weckhuysen, Professor of Inorganic Chemistry and Catalysis at Utrecht University.

Source: Utrecht University

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