A kind of method for preparing porous cerium oxide catalytic material

Abstract

The present invention relates to catalytic material preparation technology, and aims to provide a method for preparing porous cerium oxide catalytic materials. It includes: using cerium salts, cerium salt hydrates or cerium salt aqueous solutions as precursors, using lipid polymers generated in situ from organic acids and alcohols as foaming agents, and performing foaming treatment: using the precursor, water, as The ethanol of the solvent, the organic acid and the alcohol used for the esterification reaction with the acid are mixed and stirred evenly, and then heated and stirred at 50 to 170°C until it is gel-like and foaming; the foamed viscosity is The thick colloidal material is dried and roasted to obtain porous cerium oxide catalytic material. The volume of the porous cerium oxide aerogel with high porosity prepared by the present invention can reach more than 20 times the volume of commercially purchased cerium oxide. Using it to activate the C–H bonds of alkanes has excellent oxidation effects and can achieve solvent-free and efficient conversion of toluene. The synthesis process of the material is simple and low-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