Sintering-resistant mosaic Pd@cerium dioxide nanotube catalyst and preparation method thereof

Abstract

The invention discloses a sintering-resistant mosaic Pd@CeO2 nanotube catalyst and a preparation method thereof, and belongs to the field of catalysts. The catalyst comprises hollow tubular cerium dioxide (CeO2) and palladium (Pd) nanoparticles, and the Pd nanoparticles are inlaid at the inner side of the tubular CeO2; the load capacity of the Pd nanoparticles is 0.4-5.0 wt%, and the particle sizeis 2-3 nm; and the caliber of the CeO2 nanotube is 20-80 nm. Compared with traditional structured catalysts with Pd loaded on the surface of a CeO2 carrier, the catalyst of the invention can effectively prevent sintering due to the inlaying of the Pd nanoparticles at the inner side of the tubular structure of the CeO2 nanotube. The Pd is fixed at the physical position through the deposition of the CeO2 particle, and the Pd is further anchored by the chemical bonds between the Pd particle and the adjacent CeO2, so the Pd nanoparticles are still uniformly dispersed at a high temperature, and the catalyst has a good oxidation activity and stability to carbon monoxide.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a mosaic type Pd@CeO which can resist sintering 2 A nanotube catalyst and a preparation method thereof, the catalyst can be used for the removal of low-concentration carbon monoxide, and can still maintain excellent activity at high temperatures. Background technique [0002] Carbon monoxide is a colorless, odorless, poisonous gas. It mainly comes from the incomplete combustion or partial oxidation of fuels such as coal, gasoline and natural gas, the chemical industry and the use of motor vehicles. The catalytic oxidation of carbon monoxide is of great significance in basic research, practical application and environmental protection, such as CO gas detectors, breathing gas purification devices and automobile exhaust treatment. [0003] The catalysts used in the oxidation reaction of carbon monoxide can be mainly divided into two types: non-precious metal catalysts and noble metal cata...

AI Technical Summary

Problems solved by technology

Due to the influence of sintering, many catalysts cannot really be used in industrial production

When the Pd-based catalyst is sintered, the specific surface area of ​​Pd metal on it decreases, which reduces the active sites available for adsorption, the reduction of low-coordination number Pd atoms on the corner and edge positions, and the change of electronic structure, which deteriorates the catalyst reactivity. may even lead to complete inactivation

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