▎ 摘　　要

NOVELTY - A catalyst is obtained by providing graphene oxide and p-chlorobenzenesulfonic acid as raw materials, grafting sulfonyl to surface of the graphene oxide by covalent bonding and obtaining an efficient strongly acidic solid catalyst. The catalyst has graphene oxide-containing structure (I). USE - Catalyst is used for synthesizing methyl ethyl carbonate. ADVANTAGE - The catalyst has excellent service life and activity, and can be prepared by simple, economical and environmentally-friendly method. The catalyst enables synthesis of methyl ethyl carbonate with selectivity of 92.2% and yield of more than 86.7%. DETAILED DESCRIPTION - A catalyst is obtained by providing graphene oxide and p-chlorobenzenesulfonic acid as raw materials, grafting sulfonyl to surface of the graphene oxide by covalent bonding and obtaining an efficient strongly acidic solid catalyst. The catalyst has graphene oxide-containing structure of formula (I). A=graphene oxide. An INDEPENDENT CLAIM is included for preparation of catalyst, which involves adding solid graphene oxide to beaker containing deionized water, placing the beaker in a sonicator, ultrasonically treating, adding acid chloride to the resultant product under vigorous stirring, magnetically stirring at room temperature for 12 hours, grafting sulfonic acid groups to the surface of graphene oxide, filtering the resultant material, and washing with deionized water. The weight ratio of deionized water and graphene oxide is 100:1-200:1. The mass ratio of graphene oxide and acid chloride is 10:1-4:1.