A method for preparing a rhodium-based heterogeneous catalyst for alcohol carbonylation reaction and application thereof

Abstract

The application relates to a preparation method of a Rh-based heterogeneous catalyst for alcohol carbonylation reaction: 1) dispersing a dry pretreated silica carrier in anhydrous ethanol to form a uniform suspension; adding a silane coupling agent into the suspension, and heating under reflux for 3-9 hours under stirring; after the reaction is completed, solid-liquid separation is carried out, and the amino-modified SiO2 carrier is obtained through washing and vacuum drying; 2) preparing a RhCl3, RhBr3 or RhI3 aqueous solution with a concentration of 0.01-0.15 mol / L, and adjusting the pH value to 2.0-3.0; 3) mixing the amino-modified SiO2 carrier obtained in the step 1) with the RhCl3, RhBr3 or RhI3 aqueous solution obtained in the step 2), stirring at room temperature for 4-6 hours, carrying out solid-liquid separation, washing until no chlorine ion is detected, and vacuum drying, and the catalyst is obtained. The catalyst is used for preparing dicarboxylic acid through heterogeneous catalytic dihydric alcohol double carbonylation, and can overcome the pollution problem of the hydrocarbon oxidation method, the high cost problem of the nitrile / diester hydrolysis method, and the catalyst separation difficulty problem of the traditional homogeneous catalytic alcohol carbonylation method.

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