Design of Ceria Catalysts for Low‐Temperature CO Oxidation

Abstract

A catalyst active to carbon monoxide (CO) oxidation at low temperature is essential for environmental conservation, saving fuel and improvement of the quality of human life. Rational design of CO oxidation catalyst on the basis of comprehensive understanding of physicochemical properties of catalytic materials, rather than simply searching for the catalyst based on trial‐and‐error, is a promising approach to meet the increasingly stringent regulations. This review covers metal‐doped and ‐loaded system based on CeO2 catalysts as strategies to significantly improve CO oxidation activity at low temperature. When incorporated into CeO2 lattice, active metals significantly lower the oxygen vacancy formation energy (Evf) of the catalyst surface, resulting in high catalytic activities at low temperature. When the active metals are loaded on the CeO2 surface, many active sites could be acquired by increasing the dispersion, and the catalytic activity can be dramatically improved by newly introducing the interfacial sites between the metals and the CeO2 support. Doping the support could further improve this loaded system in terms of specific surface area, oxygen vacancy formation, and spillover effects. In this review, based on this knowledge, we propose a rational design approach to a robust low‐temperature CO oxidation catalysts. The desirable CO oxidation catalysts identified from the interplay between theoretical and experimental approaches would ultimately improve the quality of human life, and create potential economic benefits by alleviating air pollution.

Low temperature CO oxidation by doped cerium oxide electrospun fibers

“…In this work, the identity of dopant dominates the CO oxidation catalysis over pre-existing oxygen vacancy concentration or electrospun fiber surface area. The weak dependence on surface area has been previously reported [42].…”

“…We think that more theoretical/experimental study is needed in this aspect. For experimental study, it is important to minimize microstructural change while varying the dopants [42]. We suggest that electrospinning can be a nice platform for this since the fiber diameter is determined by solvent evaporation and electrospinning condition.…”

Towards the Effect of Pt0/Ptδ+ and Ce3+ Species at the Surface of CeO2 Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

“…O‐vacancy defects on the CeO 2 structure and its reducibility properties play a key role in the catalytic performance of various chemical transformations [12,30–32] . In this context, the pure CeO 2 nanocubes and nanowires and Pt/CeO 2 nanocubes and nanowires catalysts were investigated by temperature‐programmed reduction (H 2 ‐TPR) to gain further insights into these properties.…”

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

“…The catalytic properties of CeO 2 can be improved by several ways, which can be grouped as follows: (i) introducing doping agents and other promoters [ 12 ], and (ii) using various synthetic methods [ 13 ] that allow developing ceria porous system with a defined texture and morphology. The morphology and porous structure of the catalyst are essential factors which determine the overall specific surface area, particle shape and size, mass transport and diffusion parameters of the process, surface centers for anchoring of dopant, such as metal nanoparticles on oxide surface, and accessibility of active catalytic sites (the fraction of highly active facets, edges, and corners containing coordinatively unsaturated ions and surface defects) [ 14 ].…”