▎ 摘　　要

NOVELTY - Preparing nano-diamond/graphene composite supported iridium-tin bimetallic catalyst, comprising (i) preparing nano-diamond/graphene composite material carrier, (ii) loading iridium and tin on the nano-diamond/graphene composite carrier by the method of co-impregnation to obtain nano-diamond/graphene composite material supported iridium-tin bimetallic catalyst precursor, and (iii) placing nanodiamond/graphene composite loaded iridium-tin bimetallic catalyst precursor in the quartz tube, sequentially firing in an inert atmosphere and a hydrogen atmosphere to obtain nano-diamond/graphene composite supported iridium-tin bimetallic catalyst; and Use of nano-diamond/graphene composite supported iridium-tin bimetallic catalyst for direct dehydrogenation of n-butane to prepare 4C olefins. USE - The nano-diamond/graphene composite supported iridium-tin bimetallic catalyst is useful for direct dehydrogenation of n-butane to prepare 4C olefins (claimed). ADVANTAGE - The bimetallic catalyst: can realize efficient conversion of normal butane to generate 4C olefin under the low temperature condition; does not lose activity easily; saves energy, and has no pollution to the environment.