Method for preparing Cu/SiO2 catalyst

Abstract

The invention relates to a catalyst, in particular to a method for preparing a Cu / SiO2 catalyst. The prepared Cu / SiO2 catalyst has the advantages of higher specific area, Cu loading capacity, dispersibility, stability and the like. The preparation method comprises the following steps of: preparing an ethyl silicate solution containing a surface active agent; preparing an inorganic acid solution; adding the prepared ethyl silicate solution containing a surface active agent to a reaction kettle, simultaneously adding the prepared inorganic acid solution to the reaction kettle, stirring, and aging at constant temperature to obtain a mixed solution; dissolving the obtained mixed solution in absolute ethyl alcohol, stirring, adding catalyst and ethanol, and stirring again to obtain a mixed liquid; adding a copper salt solution containing Cu of 2-5% in calculated amount to the obtained mixed liquid, adding ammonia water to adjust the pH value, stirring, aging at room temperature, carrying out water bath at constant temperature, drying, calcining, grinding, and sieving to obtain the Cu / SiO2 catalyst.

Description

technical field [0001] The present invention relates to a catalyst, in particular to a catalyst composition suitable for the polymerization of olefins, with SiO 2 The invention discloses a preparation method of a supported catalyst in which Cu is a carrier and Cu is an active component. Background technique [0002] The chemical composition of silica gel is SiO 2 At room temperature, there is a layer of physically adsorbed water on the surface of silica gel, and the silanol [-SiOH] structure exists on the surface at the same time. At 423-473K, most of the adsorbed water is desorbed, and [-SiOH] is mainly left on the surface. At higher temperatures, the adjacent [-OH] dehydrates to form a [Si-O-Si] structure. Silica gel has special pore structure, large specific surface area and excellent thermal stability, and is widely used as adsorbent, desiccant, thickener, chromatographic column support and catalyst support, etc. [0003] As the carrier of the catalyst required for ol...

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Problems solved by technology

[0007] The current study shows that Cu / SiO 2 Catalysts have a wide range of uses as selective hydrogenation catalysts, and there are many preparation methods, but they all have certain limitations. For example, the carrier impregnation method is prone to uneven agglomeration of the active components at the edge of the fine particles of the carrier; although the ion exchange method It can disperse active components well, but the loading of active components is very low; Cu / SiO prepared by precipitation deposition method 2 The content of Cu in the catalyst is low, increasing the content of copper will lead to the growth of copper grains on the surface, which is easy to sinter