Slurry catalyst and the preparation thereof

摘要

The present invention provides a slurry catalyst and a method for preparing the same, and belongs to the technical field of preparing catalyst. Particularly, the present invention provides a slurry catalyst directly used in a slurry bed reactor for synthesizing methanol and dimethyl ether and a method for preparing the same, which uses the complete liquid phase preparation from solution to slurry without the conventional slurry-producing process of firstly forming a solid catalyst and dispersing it into an inert medium after crushing and milling. This catalyst mainly comprises Cu, Zn, Al and Zr, wherein atomic ratios of each of components are Cu/Zn/(Al+Zr)=1/0.1-5/0.15-15 and Zr/Al=1:1.0-1:30, and one or two selected from the group consisting of lanthanide metals, Mn, Mo, Si, V, W, Cr, Mg, Ni, K, Pd, Rh, Ru, Re, Pt and Sr is used a promoter. The catalyst prepared in the present invention has the advantages of good stability, high selectivity of alcohol and ether, good rheological behavior and strong wear resistance.

主权项

1. A method for preparing a slurry catalyst according to a composition of a general formula of CuZnMZrAl, wherein the atomic ratios of each of components are as follows: Cu/Zn/(Al+Zr)=1/0.1-5/0.15-15 and Zr/Al=1:1.0-1:30, and M is a promoter which is one or two selected from the group consisting of lanthanide metals, Mn, Mo, Si, V, W, Cr, Mg, Ni, K, Pd, Rh, Ru, Re, Pt and Sr, and M:Cu is 0-0.5, for synthesizing methanol and dimethyl ether in a slurry bed reactor which comprises:
I. mixing aluminum isopropoxide, zirconium oxynitrate, cupric nitrate and zinc nitrate as raw materials to prepare a gel A containing CuZnMZrAl components by way of a combination-multistep feeding, wherein a promoter M is added together with cupric nitrate; II. after stewing and aging, gel A is subjected to azeotropic distillation treatment to prepare gel B; III. dispersing homogeneously gel B in an organic medium in the presence of a surfactant to prepare gel dispersion C; and IV. treating gel dispersion C in a reaction kettle with 100% inert gas for 2-72 hours under programmed temperature ranging from room temperature to 673K and at a heating rate of from 0.5K/min to 20K/min to prepare the slurry catalyst.