Catalyst for synthesizing dimethyl carbonate and preparation method thereof

The invention relates to the technical field of dimethyl carbonate preparation, in particular to a catalyst for dimethyl carbonate synthesis and a preparation method thereof.The preparation method comprises the steps that 1, wheat straw with the complete tubular shape is cut into sections, washed clean with clear water and dried; (2) preparing slurry from CuNiAl hydrotalcite powder, micron silicon dioxide powder and a solvent; (3) mixing the slurry with the wheat straw dried in the step (1), performing stirring to enable the slurry to be fully attached to the inner surface and the outer surface of the wheat straw, separating out the wheat straw, and performing drying to obtain a catalyst precursor; (4) roasting the catalyst precursor in a protective atmosphere of flowing carbon dioxide and water vapor, so CuNiAl hydrotalcite powder and micron silicon dioxide powder are cured on the surface of the wheat straw to obtain the catalyst with the tubular structure. The catalyst has the advantages of better conversio