Solid alkali synergistic carbon-coated nickel-based amphiphilic phase transfer catalyst as well as preparation method and application thereof

Abstract

The invention discloses a solid alkali synergistic carbon-coated nickel-based amphiphilic phase transfer catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, alkaline earth metal salt, nickel salt, tin salt and citric acid are dissolved in deionized water and stirred to form a homogeneous solution; s2, stirring the homogeneous solution at 60-100 DEG C for 12-36 hours, and drying to obtain a precursor; and S3, roasting the precursor in an inert atmosphere to obtain the solid alkali synergistic carbon-coated nickel-based amphiphilic phase transfer catalyst, the molar ratio of the nickel salt to the alkaline earth metal salt is 1: (1-4); the molar ratio of the nickel salt to the tin salt is (10-40): 1; the molar ratio of the nickel salt to the citric acid is (2-6): 1; the roasting temperature is 400-700 DEG C, and the roasting time is 2-4 hours. The solid alkali synergistic carbon-coated nickel-based amphiphilic phase transfer catalyst has amphipathy, can effectively strengthen mass transfer between oil and water phases in the process of preparing higher alcohols through ethanol coupling, promotes secondary growth of carbon chains, and improves the yield of the higher alcohols.

Description

technical field [0001] The invention relates to the technical field of catalysts, and more specifically relates to a solid base synergistic carbon-coated nickel-based amphiphilic phase transfer catalyst and its preparation method and application. Background technique [0002] As plasticizers and detergents, higher alcohols are widely used in industries such as textiles, coatings, cosmetics and medicine. In addition, the blending of higher alcohols with diesel has the advantages of high energy density, low hygroscopicity, strong anti-knock performance, and good compatibility with diesel, which can significantly reduce diesel engine pollutant emissions. The traditional Ziegler method is the main method for the synthesis of higher alcohols, and its products are straight-chain normal alcohols rather than branched-chain higher alcohols with more desirable properties. [0003] The Guerbet reaction is a well-known method for converting short-chain alcohols, especially ethanol, int...

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Problems solved by technology

[0004] The primary purpose of the present invention is to overcome the problem of low yield of C4+ higher alcohols when the above-mentioned existing NiSn bimetallic catalyst is used in the aqueous phase synthesis of higher alcohols with small molecule alcohols, and to provide a solid base synergistic carbon-coated nickel-based amphiphilic phase transfer The preparation method of the catalyst, the nickel-based catalyst prepared by the method has amphiphilicity, which can effectively strengthen the mass transfer between the oil and water phases in the process of ethanol coupling to prepare higher alcohols, promote the secondary growth of carbon chains, and improve the C4+ advanced alcohols. alcohol yield

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