Inner core type cloverleaf-pattern catalyst carrier and preparation method and application thereof

Abstract

The invention discloses an inner core type cloverleaf-pattern catalyst carrier and a preparation method and application thereof. The catalyst carrier comprises a catalyst carrier bar, and the catalyst carrier bar comprises an outer shell and an inner core. The cross section of the outer shell is in a hollow cloverleaf pattern, and the hollow part of the outer shell is filled with the inner core. The outer shell is made of a porous structure material. The inner core is made of a compact structure material, and the specific surface area of the inner core is smaller than 1 m<2> / g. The preparation method includes the steps that 1, Al2O3 powder which is of a porous structure is fully mixed with an aqueous solution containing an extrusion aid and a peptizing agent, so that a material I is obtained; 2, Al2O3 powder which is of a compact structure is fully mixed with an aqueous solution containing an extrusion aid and a peptizing agent, so that a material II is obtained; 3, after the material I and the material II are subjected to extrusion molding, drying and calcining are conducted. The catalyst carrier is applied to preparation of a Fischer-Tropsch synthesis catalyst. The catalyst carrier is high in anti-crush strength, large-scale industrial production can be achieved, the diffusing effect in the Fischer-Tropsch synthesis catalyst prepared through the catalyst carrier is small, methane selectivity is low and C5+ selectivity is high.

Description

technical field [0001] The invention relates to a catalyst carrier, in particular to an inner core type clover-shaped catalyst carrier and its preparation method and application. Background technique [0002] The Fischer-Tropsch synthesis reaction is a typical heterogeneous catalytic reaction process, in which the relationship between the gas, liquid and solid phases is complex, for example: substances in the gas phase (including H 2 , CO, CO 2 and low-carbon hydrocarbons, etc.), liquid-phase substances (high-carbon hydrocarbons) and solid-phase substances (catalysts) under suitable reaction conditions, the heavy hydrocarbons (paraffin wax) generated by the Fischer-Tropsch synthesis reaction are attached to the surface of the catalyst in liquid form, or Dispersed in the main gas flow of the reaction mixture in the form of aerosol, or miscible in the slurry solvent. Under the aforementioned conditions, the catalytic reaction is carried out on the surface of the catalyst cov...

AI Technical Summary

Problems solved by technology

The performance evaluation results of the Fischer-Tropsch synthesis reaction in a fixed-bed reactor show that the catalyst activity and product selectivity with a hollow structure are significantly better than the column catalysts of the comparison example, but this thin-layer hollow catalyst has low crush resistance and is prone to Broken, short service life, not conducive to industrial applications

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