Fischer-Tropsch synthesis iron-based catalyst and preparation method thereof

Abstract

The invention relates to the field of Fischer-Tropsch synthesis, and discloses a Fischer-Tropsch synthesis iron-based catalyst and a preparation method thereof. The catalyst contains a catalytic active component Fe, catalytic aids Mn, Cu, K and Na, a carrier modifying agent M and a carrier SiO2 which match with each other according to a certain ratio, wherein M is at least one of Group IIA, Group IIB and Group IIIA metal elements. The method for preparing the Fischer-Tropsch synthesis iron-based catalyst comprises the following steps: performing a coprecipitation reaction on iron and manganese precursors; performing solid-liquid separation on the coprecipitation reaction product; pulping the obtained solid product; performing mixing with a mixture of copper, potassium and sodium precursors; mixing the obtained mixture with silica sol pretreated by an M precursor; and sequentially performing drying and roasting. The invention also discloses the catalyst prepared by the above method. According to the preparation method, the Fischer-Tropsch synthesis iron-based catalyst having excellent low-carbon olefin selectivity, lower methane selectivity and higher catalytic reaction activity can be obtained.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis, in particular to an iron-based catalyst particularly suitable for Fischer-Tropsch synthesis and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis is an important way to convert coal and natural gas into liquid fuels or high value-added chemical products. Low-carbon olefins, such as ethylene, propylene, and butene, are important chemical raw materials. At present, they mainly come from the steam cracking process of hydrocarbons such as naphtha or low-molecular hydrocarbons. With the increasing depletion of petroleum resources and With the rise of oil prices, new ways of synthesizing low-carbon olefins from coal have attracted increasing attention. In addition, from a technical and economic point of view, the direct production of low-carbon olefins by Fischer-Tropsch synthesis has broad prospects. At present, the technical development of direct productio...

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Problems solved by technology

Among them, CN101920199 A uses modified silica gel as a carrier to prepare a Fischer-Tropsch cobalt-based catalyst. The preparation method of the catalyst is to use silica gel as a carrier, first use a boron-containing alkaline solution to modify the silica gel carrier, and then use the impregnation method to load the second cobalt. agent and active component Co, the cobalt-based Fischer-Tropsch synthesis catalyst has high Fischer-Tropsch reaction activity, and the carbon number of the product is distributed in C 1 -C 30 between, with C 13 -C 30 The advantage of high selectivity betwe

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