Hydrogenation catalyst and preparation method therefor

Abstract

The invention discloses a hydrogenation catalyst and a preparation method therefor. The preparation method for the hydrogenation catalyst comprises following steps: (1) impregnating an alumina carrier into sugar acidic solution by using incipient-wetness impregnation method; drying to make the adsorption quantity of the sugar acidic solution is 30-60% of the saturated absorption solution quantity of the alumina carrier; (2) impregnating the modified alumina carrier preparing by step (1) into zinc salt solution by using unsaturated impregnation method; (3) impregnating the roasted carrier in step (2) into fountain solution containing an adsorbent by using unsaturated impregnation method; (4) impregnating the carrier containing the adsorbent in step (3) into the solution containing active metal iron; impregnating the carrier into metal auxiliary agent after drying and roasting; and getting the catalyst preparing low carbon olefin by synthetic gas after drying and roasting. The catalyst has high activity and stability in long-time running, and facilitates industrial application and popularization.

Description

technical field [0001] The invention relates to a catalyst for producing olefins from synthesis gas and a preparation method thereof, in particular to a high-activity and stability loaded iron-based catalyst for producing low-carbon olefins from synthesis gas and a preparation method thereof. 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 petroleum 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 ethy...

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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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