Copper-based nano catalyst for preparing high-carbon alcohol from synthetic gas as well as preparation method and application thereof

Abstract

The invention discloses a copper-based nano catalyst for preparing high-carbon alcohol from synthetic gas as well as a preparation method and application thereof. The catalyst is a copper-based polymetallic nano catalyst, which is composed of copper and at least one Fischer-Tropsch component. The preparation method is selected from one of replacement reaction method, step-by-step reduction method and simultaneous reduction method. The catalyst disclosed by the invention is small in particle size, large in specific surface and high in utilization rate; the preparing process is simple and convenient for operation; and when the catalyst is used for the synthesis of high-carbon alcohol from synthetic gas, by controlling the component and ratio of the catalyst, the selectivity of the alcohols higher than ethanol in the obtained alcohols is up to 95wt% and the selectivity of high-carbon alcohols higher than hexanol reaches more than 80wt%.

Description

technical field [0001] The invention relates to a catalyst for preparing higher-carbon alcohols from synthesis gas, a preparation method and application thereof, in particular to a copper-based nano-catalyst for preparing higher-carbon alcohols from synthesis gas, a preparation method and application thereof. Background technique [0002] High-carbon alcohols generally refer to monohydric alcohols with more than 6 carbon atoms, which are raw materials for the synthesis of surfactants, detergents, plasticizers and other fine chemicals, and have the advantages of high unit output value and large added value. There are basically two routes for the preparation of high-carbon alcohols. One is the natural oil route, which uses animal and vegetable oils as raw materials and prepares them by hydrogenation. However, due to the limitation of oil sources, large-scale production is difficult. The other is the chemical synthesis route, which is large-scale and can be roughly divided into...

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Problems solved by technology

[0007] (3) Noble metal catalysts, typically Rh-based catalysts, representative patents include: US Patent 4014913 and 4096164; this type of catalyst has high ethanol selectivity, but because of its high price and insufficient total alcohol selectivity, there are few reports in recent years ;

[0008] (4) Molybdenum-based catalysts, divided into MoS 2 base catalyst (representative patent: US Patent 4882360) and Mo 2 C-based catalyst; MoS 2 Molybdenum-based catalysts were first proposed by Dow Corporation in the United States; molybdenum-based catalysts have attracted the attention of researchers because of their good sulfur resistance; 2 high content

So far, there has been no literature report on the direct high-selectivity synthesis of higher alcohols from synthesis gas using copper-based nanocatalysts.

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