Preparation method of catalyst for preparing olefin from synthetic gas

Abstract

The invention discloses a preparation method of a catalyst for preparing olefin from synthetic gas. The preparation method comprises 1, carrying out isopyknic saturated immersion on an alumina carrier in an ammonium salt-containing buffer solution, carrying out drying until an adsorption quantity of the ammonium salt-containing buffer solution is 30-60% solution saturated absorption amount of the alumina carrier and carrying out aging, drying and roasting to obtain a modified alumina carrier, 2, carrying out nonsaturated immersion on the modified alumina carrier obtained through the step 1 in a zinc salt solution, carrying out drying and carrying out roasting, 3, carrying out nonsaturated immersion on the roasted carrier obtained through the step 2 in an adsorbent-containing wetting solution, and 4, drying the adsorbent-containing carrier obtained through the step 3, carrying out saturated co-immersion on the adsorbent-containing carrier obtained through the step 3 in a mixed solution of active metal iron, an auxiliary agent manganese and an auxiliary agent potassium and carrying out drying and roasting to obtain the catalyst for preparing low carbon olefin from synthetic gas. The catalyst has the characteristics of long-time cycle running activity and high stability and is conducive to industrial application and promotion.

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...

AI Technical Summary

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.

Images