Preparation of copper, zinc and aluminum methanol synthesizing catalyst by virtue of reduction deposition method

Abstract

The invention relates to a preparation method for a methanol synthesizing catalyst and belongs to the technical field of catalyst preparation. The preparation method comprises the steps of: first, preparing a mixed solution of zinc nitrate and aluminum nitrate and an alkaline precipitator solution, adding the alkaline precipitator solution into the mixed solution till the pH is 7, and then washing, drying and roasting the mixed solution to obtain a ZnO-Al2O3 carrier; then preparing an ammonia water solution and a reducing agent solution of copper sulfate, dispersing the ZnO-Al2O3 carrier in a sodium hydroxide solution, at a reaction temperature, simultaneously adding the ammonia water solution and the reducing agent solution of the copper salt into the sodium hydroxide solution containing the carrier, continuously stirring the solution, and continuously stirring the solution after addition; and finally, washing, drying, roasting and moulding a solid obtained by solid-liquid separation to obtain the copper, zinc and aluminum catalyst. The copper, zinc and aluminum catalyst prepared by the preparation method has the advantages that the active ingredient Cu is small in grain size and high in dispersity. Compared with a catalyst prepared by virtue of a traditional coprecipitation method or a step-by-step precipitation method, the methanol yield is high and the thermal stability is good.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a preparation method of a copper-zinc-aluminum methanol synthesis catalyst. Background technique [0002] Methanol is a widely used chemical raw material, potential energy carrier and clean fuel. With the rapid development of modern industry and the gradual improvement of awareness of energy and environmental issues, the demand for methanol will continue to increase in the future. The production of industrial methanol mainly uses synthesis gas as raw material, and the catalysts used are mainly copper-zinc-aluminum catalysts. At present, the scale of methanol production is expanding day by day, which puts forward higher requirements on the performance of catalysts, not only high activity, methanol selectivity and stability, but also high requirements on the content of some by-products, such as in the production of acetic acid In production, the content of ethanol in ra...

AI Technical Summary

Problems solved by technology

Most catalysts are reductively activated before use. This process has strict requirements on programmed temperature rise and hydrogen content. Improper operation will lead to sintering of the active component copper in the catalyst, thereby affecting the activity of the catalyst.

In addition, this process will also produce a certain amount of water, which will have different degrees of adverse effects on the strength of the catalyst and the dispersion of active components.

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