Multistage pore molecular sieve-supported heteropolyacid alkylation desulfurization catalyst and preparation method thereof

Abstract

The invention discloses a multistage pore molecular sieve-supported heteropolyacid alkylation desulfurization catalyst and a preparation method thereof. A multistage pore molecular sieve prepared by acid-base compound treatment is taken as a carrier, and with the aid of microwaves, a supported heteropolyacid catalyst is subjected to in-situ synthesis through a hydrothermal dispersion method. A specific synthesis method of the catalyst comprises the following steps: firstly preparing the molecular sieve carrier with multistage pore channels by adopting acid-base hydro-thermal treatment and thenperforming in-situ synthesis on the supported heteropolyacid catalyst by adopting a hydrothermal dispersion method with the aid of the microwaves. Measured by 100 percent by weight of multistage poremolecular sieve, the catalyst comprises 5-40 percent by weight of heteropolyacid; in the multistage pore molecular sieve, the molar ratio of SiO2 to Al2O3 is 10:60; the specific surface area is 200-700 m<2> / g; the pore volume is 0.3-0.8 m<3> / g. The multistage pore molecular sieve-supported heteropolyacid catalyst disclosed by the invention has the characteristics of firm active component supporting and good reusability and has the advantages of high thiophene sulfide conversion rate, good stability and high selectivity and the like when being used in the gasoline sulfide alkylation conversionprocess especially.

Description

technical field

[0001] The invention relates to the field of catalysts and their preparation, in particular to a method for preparing a multi-stage porous molecular sieve-supported heteropolyacid alkylation desulfurization catalyst. Background technique

[0002] At present, the fuel oil desulfurization technology is mainly hydrodesulfurization, but in addition to the removal of sulfur-containing compounds in the hydrodesulfurization process, olefins in gasoline are inevitably hydrogenated and saturated, and saturated hydrocarbons with relatively low octane numbers are generated, resulting in a decrease in the octane number of gasoline. And hydrodesulfurization investment and operating costs are high. Non-hydrogenation desulfurization methods include adsorption desulfurization, oxidative desulfurization, extractive distillation, and alkylation desulfurization. Among them, the alkylation desulfurization technology has the advantages of mild reaction conditions, no loss of octa...

Images