A kind of method for preparing porous cerium oxide catalytic material

Abstract

The invention relates to the preparation technology of a catalytic material and aims to provide a method for preparing a porous cerium oxide catalytic material. The method comprises steps as follows:cerium salt, a hydrate of cerium salt or an aqueous solution of cerium salt is taken as a precursor, a lipid polymer produced from organic acid and alcohol in situ is taken as a foaming agent, and foaming treatment is performed; the precursor, water, ethanol as a solvent, organic acid and alcohol which is used for being esterified with acid are mixed and stirred uniformly, and a mixture is heatedand stirred at 50-170 DEG C until the mixture is gel-like and foamed; thick colloidal matter obtained by foaming is dried and roasted, and the porous cerium oxide catalytic material is obtained. The size of high-porosity porous cerium oxide aerogel prepared with the method can reach 20 times or more that of commercially purchased cerium oxide. When applied to activation of alkane C-H bonds, the porous cerium oxide catalytic material has excellent oxidation effect, solvent-free efficient conversion of toluene can be realized, and the material is simple to synthesize and low in cost.

Description

technical field [0001] The invention relates to the preparation technology of catalytic materials, in particular to a method for preparing porous cerium oxide airgel. Background technique [0002] Aerobic catalytic oxidation is considered to be one of the most basic reaction processes in the production of fine chemicals and organic synthesis. How to realize the oxidation of alkanes under mild conditions 3 Highly selective oxidation of C–H bonds has become a key challenge in petrochemical processes. At present, the activation of C–H bonds generally needs to be carried out under the conditions of high operating temperature and the presence of a large amount of solvents, which often results in low product selectivity, carbon deposition, large energy consumption, and environmental pollution. Therefore, It is of great significance to design and prepare catalytic materials with better catalytic performance to achieve efficient and selective oxidation of C–H bonds at low temperatu...

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare a porous structure, high porosity, and many surface oxygen vacancy defects by traditional preparation methods (such as: precipitation method, hydrothermal method, etc.) (for metal oxides, if in a specific external environment (such as high temperature ), which will cause the detachment of oxygen in the lattice, resulting in the absence of oxygen and the formation of oxygen vacancies. Oxygen vacancies are a kind of defects) cerium oxide catalytic materials