Catalyst for synthesis of dimethyl ether with synthesis gas one-step method, production method and uses thereof

Abstract

The invention discloses a catalyst for one-step synthesis of dimethyl ether by synthesis gas for synthesis and a method for preparing the same, which belong to the technical field of catalyst. The general formula of the catalyst is CuZnAlMg(O)-gamma-Al2O3, wherein in the CuZnAlMg(O), Cu / Zn / Al is equal to (58 to 62) / (26 to 21) / (16 to 17), Mg / Cu is equal to between 1 / 10 and 1 / 5, and gamma-Al2O3 / CuO(mass ratio) is equal to between 1.7 / 1 and 2 / 1. The catalyst can be prepared by a method of two-step coprecipitation and deposition. Compared with the same catalyst without an auxiliary agent, the catalyst in the invention has higher dimethyl ether yield and lower carbon dioxide selectivity under high temperature condition.

Description

technical field

[0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for synthesizing dimethyl ether by one-step synthesis gas and a preparation method thereof. Background technique

[0002] Dimethyl ether is widely used as aerosol propellant, solvent, refrigerant, boron trifluoride complexing agent, etc. At the same time, dimethyl ether has many unique uses in pharmaceutical, dyestuff, pesticide and daily chemical industries. As a fuel, dimethyl ether has the advantages of sufficient combustion, no residual liquid, and no carbon precipitation. Therefore, dimethyl ether can also be used as a new type of clean energy that can replace petroleum. At this stage, domestic and foreign are studying the use of dimethyl ether directly Used as vehicle fuel or as city gas.

[0003] The key to the industrial synthesis of DME is to select an efficient catalyst. Since the 1990s in my country, there have been some patent literature repor...