The invention discloses a preparation method of a catalyst for preparing
dimethyl ether by
methanol. The method comprises the following steps: firstly, dissolving a template agent in strong alkaline solution, and adding microporous molecular sieves to be dipped so as to obtain mixed liquor, secondly, performing primary
crystallization and cooling on the mixed liquor, adjusting the pH of the mixed liquor to be 6 to 11, performing secondary
crystallization on the mixed liquor, and then filtering, washing and
drying the mixed liquor so as to obtain dried
solid powder, and thirdly, performing
ammonium ion exchange, washing and
drying on the
solid powder in
ammonium salt solution, and calcining to remove the template agent and NH3 so as to obtain the catalyst. The catalyst for preparing
dimethyl ether by
methanol disclosed by the invention is based on
cellular material, adopts strong base to dissolve material to partly destroy microcellular structures, then performs hydrothermal reconstruction in the condition that
quaternary ammonium salt template agent exists, so as to form mesoporous structure and obtain the hierarchical pore structure catalyst containing millipore and mesopore. According to the catalyst, the microcellular structures are kept, the activity decline of the catalyst is prevented, hollow structures are formed, products can be separated from the
surface layer of the catalyst conveniently, and carbon distribution is prevented. According to the preparation method, the stability, the activity and the selectivity of the catalyst are improved.