Catalyst for producing olefin by hydrogenation of CO and preparation method thereof

Abstract

The invention discloses a catalyst for producing olefin by hydrogenation of CO and a preparation method thereof. The preparation of the catalyst comprises the following steps: (1) an aluminum oxide carrier is treated by isovolumetric saturated impregnation with an acidic solution of sugar; (2) a mixed aqueous solution of nickel salt and gallium salt is prepared, and the modified aluminum oxide carrier prepared in the step (1) is treated by impregnation with the mixed aqueous solution by a nonsaturated impregnation method; (3) wetting liquid containing an adsorbent is used for impregnation of the carrier after calcination in step (2) by using a nonsaturated impregnation method; (4) the carrier containing the adsorbent in the step (3) is treated by impregnation with a solution containing active metal iron, drying and calcination are carried out, a metal auxiliary agent is used for impregnation, and drying and calcination are carried out in order to obtain the catalyst for producing light olefin from synthetic gas. The catalyst has the characteristics of long-time cycle running as well as high activity and stability, and the catalyst is good for industrial application and promotion.

Description

technical field [0001] The invention relates to a catalyst for CO hydrogenation to olefins and a preparation method thereof, in particular to a highly active and stable loaded iron-based synthesis gas-to-low-carbon olefins catalyst 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 ethylene and propylene technolog...

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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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