Method for preparing 2-methyltetrahydrofuran catalyst through gas phase hydrogenation of 2-methylfuran

Abstract

The invention discloses a method for preparing a 2-methyltetrahydrofuran catalyst through gas phase hydrogenation of 2-methylfuran, and relates to a method for preparing the catalyst. The method includes dissolving soluble nickel salt or nickel salt and other metals in water to prepare a metal salt solution with a certain concentration; adding ammonia water into the solution for sealing and stirring; adding silica sol for sealing and stirring again for a certain time after the solution is evenly stirred; evaporating ammonia gas at a certain temperature to regulate the pH value of the obtainedsuspension to reach a certain value; and washing, drying and roasting the precipitate to finally prepare the NiO / SiO2 catalyst, wherein the mass percentage of NiO is 15%-45%, the mass percentage of SiO2 is 55%-85%, and the mass percentage of the metal auxiliary agent is 0.2%-8%; and the soluble metal salts are all metal nitrates. The preparation method of the catalyst is simple and easy to operateand has good repeatability; and the prepared catalyst can form a special layered silicate structure to maintain good activity, selectivity and stability.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a catalyst for 2-methyltetrahydrofuran by gas-phase hydrogenation of 2-methylfuran. Background technique [0002] 2-Methyltetrahydrofuran is an important biogasoline fuel, chemical intermediate and high-end environmentally friendly solvent. As a bio-gasoline fuel, 2-methyltetrahydrofuran can replace part of gasoline as an automotive fuel additive, can be miscible with gasoline in any proportion, and has excellent oxidation and vapor pressure properties. Studies have shown that its proportion in gasoline can exceed 60% by volume, and it will not have any impact on engine performance, and the fuel consumption of automobiles will not increase. Using it as a gasoline additive can have higher economic value. In addition, 2-methyltetrahydrofuran can also be used as a co-solvent for ethanol, which can reduce the pressure of ethanol and increase the mixing rati...

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Problems solved by technology

The diol method usually uses 2-methyl-1,4-butanediol as a raw material to obtain 2-methyltetrahydrofuran through intramolecular dehydration, but 2-methyl-1,4-butanediol is expensive and difficult to realize industrialization ; Lactone method is in SiHCl 3 In the presence of γ-rays or ultraviolet light to irradiate the lactone, 2-methyltetrahydrofuran is obtained. The reaction conditions of this method are harsh and it is easy to cause metal pollution; for the levulinic acid method, the catalyst used is usually a noble metal catalyst containing Pt or Pd , leading to higher production costs; and the furfural method has been extensively studied because of its easy-to-obtain raw materials, but the second-step hydrogenation reaction of the furfural method mainly uses precious metals as catalysts and is carried out under high pressure conditions, which is not conducive to reducing industrial Cost of production

Although the 2-methyltetrahydrofuran obtained by the above method maintains good activity, selectivity and stability, there are also some disadvantages such as the reaction being a liquid phase reaction that cannot be carried out continuously, the catalyst containing precious metals and the reaction under high pressure. The cost increases, these factors make it impossible to apply industrially

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