N-alkane isomerization catalyst and preparation method thereof

Abstract

The invention discloses an n-alkane isomerization catalyst and a preparation method thereof. According to the catalyst, a ZnO-TiO2-Al2O3 composite oxide is used as a carrier, metal Pt is used as an active component, and Mn is used an auxiliary agent; based on the mass of the catalyst, the metal Pt content is 0.05-1.0 wt%, the auxiliary agent Mn content is 0.05-1.0 wt%, the ZnO content is 5-30 wt%,the TiO2 content is 10-80 wt%, and the balance is Al2O3; and the catalyst is prepared by using sol-gel method so as to ensure the thermal stability of the catalyst carrier, the sufficient specific surface area and the sufficient pore volume of the catalyst carrier. According to the present invention, the catalyst can be used in a hydrogen present atmosphere, has good effect in the n-alkane isomerization production of isobutane, has high activity under low temperature conditions, has isobutane selectivity of over 95%, and has good stability. .

Description

technical field [0001] The present invention relates to a catalyst for isomerization of n-paraffins and a preparation method thereof, in particular to a catalyst for preparing isobutane by isomerization of a chlorine-free platinum series n-butane supported on a composite oxide carrier and its preparation method. Background technique [0002] Isobutane, the isomerization product of n-butane, is the main raw material for the alkylation reaction and an important precursor for the synthesis of gasoline additives such as methyl tert-butyl ether (MTBE). Isobutane is widely used in many fields such as dyes, chemically synthesized refrigerants, synthetic rubber, and aviation gasoline. However, the utilization rate of n-butane is relatively low, and its added value can be greatly improved after isomerization into isobutane. [0003] The Butamer process developed by the UOP company in the United States is a representative n-butane isomerization process. This process is a typical lo...

AI Technical Summary

Problems solved by technology

When anhydrous aluminum chloride is used as a solid catalyst, the activity is high, but the selectivity and stability are poor

In recent years, SO 4 2- / ZrO 2 The representative solid superacid catalyst has attracted great attention. This type of catalyst can convert n-butane into isobutane at room temperature, but due to the serious problem of carbon deposition, its stability is extremely poor and its deactivation is extremely fast.