▎ 摘　　要

NOVELTY - Composite catalyst comprises 3-38 wt.% graphene, 40-91 wt.% molecular sieve and 4-37 wt.% metal oxide, resulting composite material has a quasi-2D sheet structure, metal oxide is uniformly dispersed on the surface of the graphene/molecular sieve composite, and metal oxide has a particle size of 10-50 nm. USE - The catalyst is useful in electrochemically oxidized in methanol, oxygen reduction reaction, oxygenation reaction, carbon dioxide electrochemical reduction of carbon dioxide and methanol; and electrocatalytic catalysis of dimethyl carbonate. ADVANTAGE - The catalyst has excellent electro-catalytic reduction catalytic activity, stability, toxicity and has good application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of composite catalyst comprising (i) mixing graphene, silicon source, aluminum source and surfactant, and then separating the graphene-containing fraction, carrying out crystallization treatment, then purifying and removing surfactant to obtain graphene/molecular sieve composites, where surfactant is tetrapropylammonium hydroxide, n-butylamine, tetraethylammonium or tetrapropylammonium, aluminum source is aluminum isopropoxide, sodium aluminate, sodium silicate and/or aluminum sulfate, and silicon source is ethyl orthosilicate, silica sol and/or sodium silicate, and (ii) supporting the metal oxide on graphene/molecular sieve obtained in step (i) to obtain final product.