Fischer-Tropsch synthetic catalyst for preparing low-carbon olefin by utilizing synthetic gas, modified molecular sieve carrier and preparation method

Abstract

The invention provides a Fischer-Tropsch synthetic catalyst for preparing low-carbon olefin by utilizing synthetic gas, a modified molecular sieve carrier and a preparation method. The Fischer-Tropsch synthetic catalyst comprises the components, namely a molecular sieve carrier and an active component, wherein the molecular sieve is a silicon-aluminium molecular sieve and / or high-silicon molecular sieve carrier modified by cerate and / or praseodymium salt, the active component takes Fe as a main component and also comprises active components, namely Mn and Cu, and an alkaline auxiliary, and the modified molecular sieve accounts for 40-80wt%; mass percent of the cerate and / or praseodymium salt on the modified molecular sieve is 1-20% of the molecular sieve; the cerate and / or praseodymium salt modified molecular sieve carrier is a cerium and / or praseodymium modified molecular sieve formed by treating a silicon-aluminium molecular sieve and / or high-silicon molecular sieve with an acid solution to obtain a hydrogen type molecular sieve, steeping the hydrogen type molecular sieve in a cerate and / or praseodymium salt solution and then drying and roasting; the cerate and / or praseodymium salt modified molecular sieve is steeped in a saline solution of the active component; and then drying and roasting are carried out, so that the Fischer-Tropsch synthetic catalyst for preparing the low carbon olefin by utilizing the synthetic gas is obtained.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis catalyst for producing low-carbon olefins from synthesis gas, a modified molecular sieve carrier and a preparation method, in particular to a catalyst and a preparation method for producing low-carbon olefins from synthesis gas through a Fischer-Tropsch synthesis reaction in one step. Background technique [0002] Light olefins are important basic organic chemical raw materials. Generally, low-carbon olefins are produced by steam cracking of naphtha derived from crude oil, but there is an urgent need for alternative raw materials and processes to overcome supply constraints and environmental problems. At present, the two-step method of producing olefins from syngas via methanol has been applied industrially, but there are problems such as complicated process, long process route and large one-time investment. Fischer-Tropsch synthesis of one-step olefins can better solve the above problems, but the s...

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Problems solved by technology

However, the preparation process is complex and difficult to realize industrial application

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