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Catalytically efficient Ni-NiOx-Y2O3 interface for medium temperature water-gas shift reaction
1Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.
Nature Communications
|May 4, 2022
Summary
A novel Nickel-Yttrium oxide (Ni-Y2O3) catalyst significantly boosts the water-gas shift reaction by creating active interfaces. This new catalyst demonstrates the highest activity reported for Ni-based catalysts, enhancing H2O dissociation.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Metal-support interfaces are crucial for catalytic stability and activity.
- Rare earth oxide interfaces, like Ni-Y2O3, offer unique electronic properties for enhanced binding with molecules such as H2O.
Purpose of the Study:
- To design and synthesize a highly efficient composite Ni-Y2O3 catalyst.
- To investigate the role of metal-rare earth oxide interfaces in catalytic reactions, specifically the water-gas shift (WGS) reaction.
Main Methods:
- Design and synthesis of a composite Ni-Y2O3 catalyst.
- Evaluation of catalytic activity under water-gas shift (WGS) reaction conditions.
- Theoretical calculations and in situ/ex situ experimental studies to elucidate reaction mechanisms.
Main Results:
- The Ni-Y2O3 catalyst formed abundant active Ni-NiOx-Y2O3 interfaces under WGS conditions.
- Achieved a record high activity of 140.6 μmolCO gcat-1 s-1 at 300°C for Ni-based catalysts.
- Yttrium oxide (Y2O3) was found to facilitate H2O dissociation at the interfaces, a key step in the WGS reaction.
Conclusions:
- The engineered Ni-NiOx-Y2O3 interfaces are highly effective for activating molecules.
- This interfacial design strategy shows significant promise for improving various catalytic systems.
- The study highlights the importance of metal-rare earth oxide interfaces in catalysis.
