Catalyst for synthesis gas reaction and preparation method and application thereof

Abstract

The invention discloses a catalyst for synthesis gas reaction and a preparation method and application thereof. The preparation of the catalyst comprises the following steps: (1) carrying out equivalent-volume saturated impregnation on an alumina carrier with an aqueous solution of a nitrogen-containing organic compound; (2) preparing a mixed aqueous solution of nickel salt and gallium salt, and impregnating the modified alumina carrier prepared in the step (1) with the above mixed aqueous solution by an unsaturated impregnation method; (3) impregnating the carrier roasted in the step (2) with a wetting solution containing an adsorbent by an unsaturated impregnation method; (4) impregnating the adsorbent-containing carrier obtained in the step (3) with a solution containing active metal iron and a promoter manganese, drying, roasting and impregnating with a metal promoter potassium solution, drying, and roasting to produce the catalyst for preparing low-carbon olefin by catalyzing synthesis gas. The catalyst has the characteristic of high activity stability for long-term operation and is beneficial to industrial application and promotion.

Description

technical field [0001] The invention relates to a catalyst for synthesis gas reaction, its preparation method and application, in particular to a highly active and stable loaded iron-based catalyst for producing low-carbon olefins from synthesis gas 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 tec...

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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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