Hydrogenation catalyst, preparation method and applications thereof

Abstract

The invention discloses a hydrogenation catalyst, a preparation method and applications thereof. The catalyst preparation comprises: (1) preparing the mixed aqueous solution of a nickel salt and a gallium salt, and impregnating the mixed aqueous solution by using alumina as a carrier through an unsaturated impregnation method; 2) impregnating the calcined carrier in the step (1) with an adsorbent-containing wetting liquid through an unsaturated impregnation method, wherein the adsorbent is an organic amine having a carbon number of 2-15, and the adding amount of the adsorbent accounts for 1-10% of the weight of the calcined carrier in the step (1); and (3) drying the adsorbent-containing carrier in the step (2), impregnating with a solution containing an active metal iron and an auxiliary agent manganese, drying, calcining, carrying out unsaturated spray impregnating with a metal auxiliary agent potassium, drying, and calcining to produce the syngas-to-low-carbon-olefin catalyst. According to the present invention, the catalyst has characteristics of high activity and high stability after long-term running, and is beneficial to industrial application and popularization.

Description

technical field [0001] The invention relates to a hydrogenation catalyst and its preparation method and application, in particular to a high activity and stability supported iron-based syngas-based low-carbon olefin catalyst and its preparation method. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic organic chemical raw materials. With the development of the chemical industry, their demand is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of oil resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin production processes based on coal and natural gas. The development of direct production of ethylene and propylene technology from syngas (whic...

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Problems solved by technology

[0003] CN1065026A discloses a method for producing ethylene from synthesis gas, which involves the preparation of catalysts by chemical precipitation and mechanical mixing, using precious metals or rare metals, such as niobium, gallium, praseodymium, scandium, indium, cerium, lanthanum, ytterbium, etc. For other chemical elements, the selectivity of ethylene is 65%-94%, but the conversion rate of CO is very low, only about 10%, 12% and 15%. The recycling of CO will inevitably lead to energy consumption, and the catalyst cost is high

However, the activity stability of the long-term operation of the above-mentioned Fe-based silica gel-supported synthesis gas to directly prepare low-carbon olefins catalysts still needs to be further improved.

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