Catalyst for preparing low carbon mixed alcohol through synthesis gas and preparation method thereof

Abstract

The invention relates to a catalyst for preparing low carbon mixed alcohol through synthesis gas and a preparation method thereof, which relate to low carbon mixed alcohol. The catalyst is a supported FeCo-alloy@Cu core-shell structure catalyst; a core layer of the core-shell structure is FeCo-alloy; a shell layer is Cu; an active phase of the core-shell structure FeCo-alloy@Cu accounts for 10 percent to 50 percent, and the balance is a carrier. The preparation method comprises the steps of mixing ferric salt, cobalt salt, dibenzyl ether, oleic acid and oleylamine; cooling a solution subjected to heating reaction, washing, centrifuging, and drying to obtain FeCo alloy nano particles which are denoted as the FeCo-alloy; re-dispersing the FeCo-alloy into absolute ethyl alcohol containing polyacrylamide for carrying out ultrasonography; adding a copper-bearing compound, adding an NH3.H2O solution to obtain a solution A, then adding a sodium borohydride solution, and obtaining a solid suspension liquid with the core-shell structure; then adding a carrier, stirring, carrying out extraction filtration, washing, and reducing dried solid to obtain the catalyst.

Description

Technical field [0001] The present invention relates to low-carbon mixed alcohols, in particular to a catalyst for preparing low-carbon mixed alcohols from synthesis gas and a preparation method thereof. Background technique [0002] With the increasing scarcity of petroleum resources, it is urgent to actively seek and develop new technologies to replace or partially replace non-renewable petroleum resources. In recent years, the use of renewable biomass, natural gas (shale gas) or coal through synthesis gas (CO+H 2 ) The conversion of platform molecules to low-carbon mixed alcohols and other high-value chemicals has become a research hotspot in the field of energy and chemical engineering, and it is also a very important research direction in the field of C1 chemistry. [0003] At present, the catalysts for preparing low-carbon mixed alcohols from synthesis gas mainly include precious metal catalysts, modified methanol synthesis catalysts, modified Fischer-Tropsch synthesis cataly...

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Problems solved by technology

Chinese patent CN103191741A reports a copper-iron core-shell catalyst and preparation method for synthesizing low-carbon alcohols. The core of the catalyst is Fe 2 o 3 , the shell is CuO, the catalyst can prevent iron sintering, but its CO conversion rate is not high (up to 35%), and the methanol content of the product accounts for more than 35%

Although some progress has been made in the above research, the catalytic performance, especially the product selectivity, is still not high, and the structural stability of catalysts with special structures such as the core-shell structure in the reaction process needs to be further investigated.

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