Integral catalyst for producing dimethyl ether by synthesis gas directly as well as its preparing method

Abstract

The invention relates to monolithic catalyst directly producing dimethyl ether with synthetic gas, and the preparation method thereof. The monolithic catalyst takes monolithic honeycomb cordierite as the matrix, and takes CuO-ZnO-MxOy / HZSM-5 as active components, MxOy expresses auxiliary agent of the active components, and M can be selected from Al, Zr, B, Ce or La; by quality, the CuO-ZnO-MxOy has 12 to 30 parts, the HZSM-5 has 5 to 16 parts, and the cordierite has 60 to 80 parts. The preparation method of the monolithic catalyst includes that a coating method and a uniform co-precipitation method are utilized. The preparation method has the coating method that dilute nitric acid, surface active agent, deionized water, etc are added into the CuO-ZnO-MxOy obtained in the co-precipitation method or the CuO-ZnO-MxOy-HZSM-5 obtained in the co-precipitation method for the ball milling; after being pulped, the mixture is coated on HZSM-5 / cordierite or the cordierite; and after being dried and roasted, a dimethyl ether monolithic catalyst finished product is obtained. Prepared in the method provided by the invention, the monolithic catalyst directly producing the dimethyl ether with the synthetic gas has good catalytic activity and stability.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an integral catalyst used for directly producing dimethyl ether from synthesis gas and a preparation method thereof. Background technique [0002] The direct synthesis of DME from synthesis gas is a two-reaction process in which synthesis gas simultaneously completes methanol synthesis and methanol dehydration in a reactor, so the DME synthesis catalyst includes a methanol synthesis catalyst and a methanol dehydration catalyst. Early dimethyl ether synthesis catalysts were formed by mechanically mixing the two catalysts directly, but this mechanical mixing method would cause the two active centers to be far apart on the microcosm, and the synergistic effect of the two could not be well exerted; CN1233527A, CN1132664A, CN1356163A etc. have adopted co-precipitation deposition or co-precipitation impregnation method to prepare bifunctional dimethyl ether synthesis catal...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a new monolithic catalyst for directly preparing dimethyl ether from synthesis gas and its preparation method, which breaks through the traditional granular catalyst system. This monolithic honeycomb cordierite is used as the catalyst substrate, and it is active with a series of metal oxides. The monolithic dimethyl ether catalyst made by combining the components overcomes the problems of large particles, easy sintering of active components, and poor catalytic activity of the dimethyl ether synthesis catalyst in the prior art, and makes the monolithic catalyst for synthesis of dimethyl ether from syngas Has good catalytic activity and stability

Images