Bifunctional catalyst and method for preparing ethylene with carbon monoxide hydrogenation

Abstract

The invention belongs to the direct preparation of ethylene by hydrogenation of carbon monoxide, concretely relates to a bifunctional catalyst and a method for preparing ethylene with carbon monoxidehydrogenation. Carbon monoxide and hydrogen are use as raw materials and are subjected to conversion reaction on a fixed bed or a moving bed; the catalyst is a composite catalyst formed by mixing component A and component B; the active ingredient of component A is a metal oxide, and component B is an aliphatic amine-modified molecular sieve of an MOR structure; and the weight ratio of the active ingredient of component A to component B is in the range of 0.1-20, preferably 0.3-8. The reaction process has higher product yield and selectivity, and the selectivity of C2-C3 olefins reaches up to 78-87%, wherein the selectivity of hydrocarbon products of more than four C atoms is lower than 10%, the selectivity of by-product methane is lower than 9%, and the selectivity of ethylene reaches 75-82%. Therefore, the bifunctional catalyst has good application prospect.

Description

technical field [0001] The invention belongs to high-value chemicals such as carbon monoxide hydrogenation to produce low-carbon olefins, and specifically relates to a dual-function catalyst and a method for carbon monoxide hydrogenation to ethylene. Background technique [0002] Ethylene is a very important basic chemical raw material and one of the largest chemical products in the world. The ethylene industry is the core of the petrochemical industry and occupies an important position in the national economy. Low-carbon olefins refer to olefins with carbon atoms less than or equal to 4. Low-carbon olefins represented by ethylene and propylene are very important basic organic chemical raw materials. With the rapid growth of my country's economy, my country's ethylene industry has developed rapidly and occupies an important position in the world's ethylene market. For a long time, the low-carbon olefins market has been in short supply. At present, the production of ethylen...

AI Technical Summary

Problems solved by technology

But ethylene single selectivity is less than 20%

Academician Bao Xinhe and Pan Xiulian of Dalian Institute of Chemical Physics, Chinese Academy of Sciences reported that ZnCr supported on alumina 2 o 4 Oxide and hierarchical porous SAPO-34 molecular sieve composite bifunctional catalyst (Jiao et al., Science 351 (2016) 1065-1068), achieved a selectivity of 80% for low-carbon olefins at a CO conversion rate of 17%, but ethylene The selectivity is less than 30%

In the patent 201710129620.9 they applied for, a bifunctional catalyst containing oxygen holes and MOR molecular sieves was used for the one-step olefin reaction of syngas, which increased the selectivity of ethylene to 75-80%, but the number of carbon atoms in the by-product exceeded 3 has more hydrocarbons, which affects the application of this technology

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