Catalyst for preparing low-carbon alcohol from synthetic gas and preparation method for catalyst

Abstract

The invention discloses a catalyst for preparing low-carbon alcohol from synthetic gas and a preparation method for the catalyst, and relates to low-carbon alcohol. The catalyst for preparing the low-carbon alcohol from the synthetic gas is a Cu@Fe core-shell structure catalyst employing Cu as a core and Fe as a shell, and the molar ratio of Cu and Fe of the catalyst is 1:6 to 6:1. The preparation method comprises the following steps of adding a copper-containing compound into water to prepare a solution A; preparing a mixed solution B of sodium borohydride and polyvinylpyrrolidone; adding the mixed solution B into the solution A to obtain Cu core-containing suspension C, adding a HCl solution, regulating the pH to be 7 to 8, adding a Na2CO3 solution, and regulating the pH to be 10 to 11 to obtain suspension D; preparing an aqueous solution of an iron-containing compound, adding the aqueous solution into the suspension D, adding an aqueous solution of sodium borohydride to obtain core-shell structure solid suspension, performing suction filtration, washing and drying, and reducing dried solids in hydrogen-containing gas to obtain the catalyst for preparing the low-carbon alcohol from the synthetic gas.

Description

technical field [0001] The invention relates to low-carbon alcohols, in particular to a catalyst for preparing low-carbon alcohols from synthesis gas and a preparation method thereof. Background technique [0002] In recent years, with the continuous consumption of petroleum resources, the development of efficient utilization of non-oil-based carbon resources has attracted more and more attention from industry and academia at home and abroad. Syngas (H 2 +CO) is directly converted to ethanol under the action of a catalyst 2+ Oxygenates are a key process in the production of basic chemical raw materials and clean fuel additives through the catalytic conversion of non-oil-based carbon resources from syngas. Ethanol etc. C 2+ In addition to being used as key chemical raw materials, oxygenated compounds have also been proven to be high-octane, low-pollution automotive fuel additives. In recent years, domestic and foreign research on the direct production of ethanol and other...

AI Technical Summary

Problems solved by technology

The core-shell catalyst components in this system are oxides, which may be agglomerated after reduction pretreatment before the Fischer-Tropsch reaction, and the core-shell structure is easily destroyed and difficult to maintain, resulting in low activity.

[0006] It can be seen from the above-mentioned patents and literature reports that although the above-mentioned catalysts can be used to obtain higher space-time yields of low-carbon alcohols and higher C 2+ Alcohol selectivity, but basically there is a low conversion rate of CO (mostly around 20%), and a large amount of CO is produced by-product 2 , the total alcohol contains a relatively high content of methanol, ethanol, etc. C 2+ Disadvantages of low alcohol selectivity

One-step conversion of syngas to produce C with high selectivity 2+ No breakthroughs have been made in the study of oxygenate catalytic systems

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