Catalyst used for preparing lower alcohol by synthesis gas, preparation method and application thereof

Abstract

The present invention provides a catalyst used for preparing lower alcohol by synthesis gas, which has an expression formula of PdCuFeMnZrZnO. The catalyst comprises the following metals in percentage by mass: 0.1 to 1 percent of Pd, 10 to 20 percent of Cu, 10 to 20 percent of Fe, 10 to 20 percent of Mn, 20 to 40 percent of Zr, and 20 to 40 percent of Zn. The preparation method comprises the following steps: preparing FeMnZrZnO composite metal oxide by a deposition-precipitation method; then, adding metals Pd and Cu into the oxide through a method of chemical plating; and finally, obtaining the lower alcohol catalyst which has evenly distributed active metals and generates strong interaction by controlling pretreatment conditions of drying, roasting, reducing and the like. The multi-component metal catalyst prepared by the method has the advantages of simple preparation process, easy repetition and amplification and the like; and the catalyst for synthesizing the lower alcohol by the synthesis gas has the characteristics of mild reacting condition, high activity, and high selectivity of high grade alcohol over C2.

Description

technical field [0001] The invention relates to a catalyst for synthesizing low-carbon mixed alcohols from synthesis gas. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. [0003] The invention also relates to the use of the catalysts described above. technical background [0004] Whether in the world or in China, energy strategy is a very important issue. With the depletion of oil resources, the energy structure is shifting to a pattern dominated by coal and natural gas, supplemented by renewable energy. Coal, natural gas and biomass, etc., are synthesized by synthesis gas (CO+H 2 , usually containing a certain amount of CO 2 and inert gas N 2 etc.) The research on the preparation of liquid fuels and bulk chemicals has been paid more and more attention. Under different catalysts and reaction conditions, synthesis gas conversion can produce linear alkanes, light olefins and long chain α-olefins, C 4 Isomerized hydroca...

AI Technical Summary

Problems solved by technology

However, the traditional metal catalyst preparation methods commonly used in industry, such as impregnation and co-precipitation techniques, inevitably form independent transition metal oxides, especially in the process of roasting heat treatment, reduction activation and hydrothermal reaction, independent active centers make C 2 It is difficult to increase the content of the above higher alcohols or form a large amount of hydrocarbon by-products such as methane and the stability of the catalyst is poor, etc.

After nearly two decades of development, these problems still restrict the economics of syngas synthesis of low-carbon alcohols, making it difficult to realize industrialization

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