Preparing method of copper-silicon catalyst for preparing ethylene glycol by hydrogenating dimethyl oxalate

Abstract

The invention relates to copper-silicon catalysts, in particular to a preparing method of a copper-silicon catalyst for preparing ethylene glycol by hydrogenating dimethyl oxalate. The preparing method includes the steps that silica sol is added into water to obtain silica sol dispersion liquid; copper salt is dissolved in deionized water, ammonia water is added to form a copper-ammonia complex-ion solution, and then ammonia chloride is added to obtain a copper-ammonia complex-ion mixed solution; the silica sol dispersion liquid is added into the copper-ammonia complex-ion mixed solution to obtain a silica sol and copper-ammonia complex-ion mixed solution, the mixed solution is transferred into a closed container, the container is placed in a constant-temperature environment to obtain blue precipitate, blue powder is obtained through cleaning and then airing and dispersed into water again, and dispersion liquid of a mesoporous copper-silicon catalyst precursor is obtained after ultrasound treatment; the dispersion liquid is placed in a water bath, L-arginine and a cationic surface active agent are added into the dispersion liquid, and then tetraethoxysilane is added to obtain light blue precipitate; the light blue powder is obtained through cleaning, airing and heat treatment, and the cationic surface active agent is removed from the light blue powder to obtain the copper-silicon catalyst for preparing ethylene glycol by hydrogenating dimethyl oxalate.

Description

technical field [0001] The invention relates to a copper-silicon catalyst, in particular to a method for preparing a copper-silicon catalyst used for hydrogenation of dimethyl oxalate to ethylene glycol. Background technique [0002] As a widely used chemical product, ethylene glycol has been applied in the polyester industry, energy, fine chemicals, textiles, and automobile manufacturing. In recent years, with the development of my country's national economy, the market demand for ethylene glycol has grown rapidly. my country has become the world's largest consumer country, accounting for more than 30% of the world's total ethylene glycol consumption. At the same time, the contradiction between the rapid growth of my country's demand for ethylene glycol and the relative shortage of production capacity is becoming increasingly fierce. According to incomplete statistics, my country's demand for ethylene glycol in 2012 is expected to be about 9.5 million tons, but the domesti...

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Problems solved by technology

However, the existing copper-silicon catalysts are difficult to produce copper phyllosilicate species and monovalent copper (Yin, A.Y., X.Y. Guo, etal. Applied Catalysis-General 2008, 349(1-2): 91-99.)

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