Copper-palladium-loaded mesoporous silicon carbide-based catalyst, preparation method and application thereof

A method for preparing a copper-palladium-loaded mesoporous silicon carbide-based catalyst, comprising the following steps:

• S1. mixing and stirring P123, water, hydrochloric acid, and tetraethyl orthosilicate to obtain a homogeneous solution;
• stirring the homogeneous solution in a water bath for crystallization to obtain a crystallized solution, then performing a first treatment of cooling, filtering, drying and calcination on the crystallized solution to obtain mesoporous silica;
• S2. dissolving polycarbosilane in xylene to obtain a polycarbosilane solution, wherein a number-average molecular weight of the polycarbosilane is 1500-2500;
• mixing and stirring the mesoporous silica and the polycarbosilane solution to obtain a first mixture, drying the first mixture after the xylene is completely volatilized to obtain a first dried powder, and then subjecting the first dried powder to a second treatment of calcination, etching, washing and drying to obtain mesoporous silicon carbide;
• S3. mixing PdCl2 and Cu(NO3)2.3H2O to obtain a copper-palladium precursor mixed solution;
• and
• S4. adding the mesoporous silicon carbide to the copper-palladium precursor mixed solution to obtain a second mixture, drying the second mixture after a solvent of the second mixture is completely volatilized to obtain a second dried powder, and then subjecting the second dried powder to a third treatment of calcination in a nitrogen atmosphere and reduction in a hydrogen atmosphere to obtain the copper-palladium-loaded mesoporous silicon carbide-based catalyst.