A kind of preparation method of C5, C6 alkane isomerization catalyst

Abstract

The invention relates to a preparation method for a C5 and C6 alkane isomerization catalyst. The preparation method comprises the following steps: (1) mixing, kneading, extruding and forming mordenite, an inorganic binder, methylcellulose and a nitric acid solution, and performing drying and roasting to obtain a carrier; (2) soaking the carrier in the step (1) in hydrophobic organic amine-alcohol solution, and adding organic amine according to 20%-150% (a molar fraction) of total acid amount of the carrier detected by NH3-TPD, wherein the weight of a soaking solution is 1.2-3 times that of the carrier; (3) drying the soaked carrier, and controlling the drying temperature to be 0-100 DEG C before and after a low-temperature desorption peak detected by NH3-TPD; and (4) performing ion exchange on a VIII-family metal precursor for the carrier dried in step (3), and performing drying and roasting to obtain the catalyst. According to the catalyst prepared by the preparation method, noble metals are highly dispersed, and are uniformly distributed inside the catalyst; and the catalyst is used for C5 and C6 alkane isomerization reaction, so that a normal-alkane conversion rate is high and isomeric selectivity is good.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a preparation method of a C5 and C6 alkane isomerization catalyst. Background technique [0002] Domestic gasoline emission standards have increasingly strict restrictions on olefins and aromatics. Currently, the national VI gasoline emission standards are being formulated. In order to reduce exhaust pollution, it is an inevitable trend to reduce the content of olefins and aromatics in gasoline. Olefins and aromatics have high octane numbers and are important gasoline blending components. For example, C5 olefins are 90, C6 olefins are 94, benzene is 108, toluene is 103.5, and ethylbenzene is 98.9. Therefore, the reduction of olefins and aromatics will lead to gasoline Significant loss of octane. After the isomerization of normal C5 and C6 alkanes, the octane number is greatly increased, which is safe and environmentally friendly. It is a necessary supplement for future gasoline blending...

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Problems solved by technology

[0013] The above invention has made some progress in molecular sieve modification and simplification of preparation steps, but the metal dispersion has not been improved.

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