▎ 摘　　要

NOVELTY - Solid super acid catalyst comprises Cr2O3-SiO2 as a composite carrier, graphene as a hard template, sulfuric acid as a sulfur source, X-SO42-/Cr2O3-SiO2 solid super strong acid modified by transition metal X. USE - Solid super acid catalyst used for preparing p-methoxy cinnamic acid isooctyl ester (claimed). ADVANTAGE - The solid acid catalyst helps to reduce the reaction temperature, also improves the conversion rate and the selectivity of the p-methoxy cinnamic acid, after the transition metal modification, and greatly improves the reaction strength and service life of catalyst. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing p-methoxy cinnamic acid isooctyl ester, which involves: taking p-methoxycinnamic acid and isooctanol as raw materials, alkane compound as solvent under the action of the X-SO42-/Cr2O3-SiO2 solid super acid catalyst.