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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Highly Stable Pt/CeO₂ Catalyst with Embedding Structure toward Water-Gas Shift Reaction.

Jun Yu^1,2, Xuetao Qin³, Yusen Yang^1,2

¹State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.

Journal of the American Chemical Society

|December 29, 2023

Summary

A novel Pt/CeO2(110) embedding structure enhances catalyst stability and activity. This interface facilitates electron transfer and stabilizes platinum clusters, boosting performance in the water-gas shift reaction.

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Area of Science:

Heterogeneous Catalysis
Materials Science
Surface Chemistry

Background:

Strong metal-support interaction (SMSI) is crucial for catalyst stability and performance.
The precise origin and mechanisms of SMSI remain incompletely understood.
Understanding SMSI is key to designing advanced catalytic materials.

Purpose of the Study:

To investigate the origin of SMSI using a model Pt/CeO2 catalyst.
To elucidate the role of specific crystallographic planes of CeO2 in SMSI.
To correlate interfacial structure with catalytic activity and stability.

Main Methods:

Synthesis and characterization of Pt/CeO2 catalysts on (110) and (100) CeO2 planes.
Experimental techniques including in-situ/operando spectroscopy and microscopy.
Density Functional Theory (DFT) calculations for electronic structure and reaction pathways.

Main Results:

Discovery of a Pt cluster embedding structure within the CeO2(110) lattice (3-4 atomic layers).
Observation of enhanced electron transfer and formation of a Pt-O-Ce3+ interfacial structure on CeO2(110).
Pt/CeO2(110) exhibits superior activity (15.76 molCO gPt-1 h-1) and stability (120h) for the water-gas shift reaction compared to Pt/CeO2(100).

Conclusions:

The embedding structure at the Pt/CeO2(110) interface is intrinsic to SMSI and enhances catalyst stability.
Interfacial sites act as active centers for the water-gas shift reaction, promoting CO adsorption and H2O dissociation.
This study provides fundamental insights into SMSI, paving the way for designing highly stable and active heterogeneous catalysts.