Catalyst for synthesizing dimethyl ether one-step with synthesis gas as well as its preparing method

Abstract

The invention relates to catalyst synthesizing dimethyl ether with synthetic gas in one step and the preparation method thereof, and belongs to the catalyst preparation technical field. The invention is characterized in that a methanol synthetic component and a methanol dehydration component are prepared in a one pot way under the same condition, active components of Cu and Zn are added in the liquid phase condition, and Si-Al oxide, molecular sieve, and a silica resource, an aluminum resource, and template agent required by organic-inorganic hybrids of Si or Si-Al are formed under the liquid phase completely, and thus slurried catalyst with the general formula which is CuZnMSiAl (M is auxiliary agent) is prepared. The environmental change and the phase change are not required during the preparing process, the operation is simple, the repeatability is good, the pore structure can be controlled, the activity is high, and the preparation method is especially suitable for preparing the catalyst used by a slurry bed reactor.

Description

technical field [0001] The invention discloses a catalyst for synthesizing dimethyl ether by one-step synthesis gas and a preparation method thereof, belonging to the technical field of catalyst preparation. Specifically, it relates to a method for preparing a catalyst for directly synthesizing dimethyl ether from synthesis gas in a slurry state composed of Si, Al and other components. Background technique [0002] At present, the main preparation method of a one-step dimethyl ether synthesis catalyst is to combine a methanol synthesis catalyst and a methanol dehydration catalyst. The former mostly uses copper-based catalysts, the main components are Cu and Zn, and a small amount of Al 2 o 3 As a structural aid; the latter mainly consists of acidic dehydrating components. Molecular sieves are widely used as methanol dehydration catalysts because of their rich microporous structure, large specific surface area, good adsorption performance and surface acidity. However, at ...

AI Technical Summary

Problems solved by technology

However, the preparation of this type of catalyst is still in the stage of mechanical mixing, and the methanol synthesis active components and molecular sieves cannot achieve highly uniform mixing

In the slurry bed reactor, the two components of the catalyst prepared by this method will be further separated during the reaction process, the synergistic effect between the components will become poor, and the catalyst will easily agglomerate, agglomerate, and deactivate