A catalyst for producing low-carbon olefins from synthesis gas and its preparation method

Abstract

The invention discloses a preparation method of a catalyst for producing low-carbon olefins from synthesis gas, which comprises the following steps: (1) using alumina as a carrier to impregnate a zinc salt solution by an unsaturated impregnation method, drying and roasting; (2) using an unsaturated impregnation method Impregnate the calcined carrier in step (1) with a wetting solution containing an adsorbent, wherein the adsorbent is an organic amine with a carbon number of 2 to 15, and the amount of the adsorbent added accounts for 1%~10% of the weight of the carrier; (3) Step (2) The carrier containing the adsorbent is dried and impregnated with a solution containing active metal iron and additive manganese, and after drying and roasting, it is unsaturated sprayed and impregnated with the metal additive Potassium, and then dried and roasted to obtain a low-carbon olefin catalyst from synthesis gas. The catalyst has the characteristics of high activity and stability in long-period operation, and is beneficial to industrial application and popularization.

Description

technical field [0001] The invention relates to a catalyst for producing low-carbon olefins from synthesis gas and a preparation method thereof, in particular to a high-activity and stable 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 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 et...

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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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