Ultra‐Small Noble Metal Ceria‐Based Catalytic Materials: From Synthesis to Application

Abstract

At present, catalysts play an important role in modern industries, and there are 80 percent of industrial reactions need the participation of catalysts. Noble metal catalysts have significant applications in many fields because of the high selectivity, fine stability and excellent reactivity. However, the large-scale applications of noble metal are limited by the high price. Preparing noble metal catalysts as small as possible or even in single atom dispersion, can effectively improve the atomic, which partly solves the problem of high price. Nevertheless, this will lead to another problem that the surface free energy increases quickly when the size of noble metal decreases, resulting in the aggregation of noble metal. To address this issue, a suitable support is needed to fix noble metal. CeO 2 , as an ideal supporting material, has received widespread attention due to the excellent properties including two valences which are easy to interconvert, high oxygen storage capacity and a large number of oxygen deficiencies. So far, the ultra-small noble metal ceria-based catalytic materials have been widely developed in many catalysis fields, such as CO oxidation, water-gas shift reactions, hydrogenation reaction, etc. In this review, the controlled preparations, influence factors and applications of ultra-small noble metal supported on CeO 2 carrier are introduced. Besides, the developments and challenges of this field are proposed.

Approaching C1 Reaction Mechanisms Using Combined Operando and Transient Analysis: A Case Study on Cu/CeO2 Catalysts during the LT-Water–Gas Shift Reaction

“…It is therefore of great importance to find efficient and cost-effective WGS catalysts that run efficiently even at low temperatures (<200 °C). Metal-loaded ceria has been proven to be a good alternative to the conventional copper–zinc oxide catalysts used in industry, − but important aspects such as the reaction mechanism, the role of the metal, and the influence of the ceria support properties are still a matter of debate.…”

Synthesis of mesoporous SiO2–CeO2 hybrid nanostructures with high catalytic activity for transamidation reaction

“…[12][13][14][15][16] Mainly ceria-based noble metal catalysts were applied for different catalytic applications because of their high reactivity. [17][18][19] From a green chemistry point of view, ceria has been receiving a lot of interest as a promoter, automobile exhauster, and pollution abatement material. [20][21][22] Ceria is widely used in organic catalytic reactions because of its distinctive ability to transfer more oxygen and the possibility of variation of oxidation state between reduced and oxidized species (Ce 3+ to Ce 4+ ).…”

Rhodium Encapsulated within Silicalite‐1 Zeolite as Highly Efficient Catalyst for Nitrous Oxide Decomposition: From Single Atoms to Nanoclusters and Nanoparticles

“…[3,4] Reducing the particle size not only improves the exposed surface area of metal particles (or metal dispersion) but also alters both the electronic and geometric property of the surface metal sites, resulting in a great impact on the catalytic performance for supported metal catalysts. [5][6][7][8][9][10][11][12] Previous studies on the size effect were usually made with supported metal nanoparticles with a diameter higher than 2 nm. [13][14][15] Metal-cluster (< 2 nm) and single-atom catalysis have attracted considerable attention in recent years as new frontiers in heterogeneous catalysis, spurred by advances in practical synthetic methodologies, characterization techniques and computational modelling of structurally well-defined supported metal clusters and atomically dispersed metal species.…”