Preparation method for preparing gasoline catalyst with methanol

Abstract

The invention relates to a preparation method for preparing a gasoline catalyst with methanol. The preparation method is characterized by comprising the following steps of: before molding the catalyst, performing aluminum-removing and silicon replenishing treatment on a catalyst matrix nanoscale ZSM-5 molecular sieve with an acid solution to adjusting the acidic property of the molecular sieve; and after the catalyst is molded, pretreating the catalyst by using a hydrothermal aging device to enhance the gasoline selectivity and stability of the catalyst. When the catalyst prepared with the method is applied to a reaction for preparing gasoline with methanol on a section of fixed bed, the gasoline yield is up to 36-37 percent.

Description

technical field [0001] The invention belongs to the technical field of methanol deep processing, and in particular relates to a method for preparing a methanol-to-gasoline catalyst. Background technique [0002] In recent years, under the background of high oil prices, research on coal-to-liquids (CTL) has continued to heat up, and methanol-to-gasoline (MTG), as one of the core technologies in the second half of CTL, has also been favored again. The MTG process is developed on the basis of the conversion of methanol into aromatics on ZSM-5 molecular sieves developed by Mobil Company - coal or natural gas is used as raw material to produce synthesis gas, and then methanol is produced from synthesis gas, and finally crude methanol is converted into High octane gasoline. US3928483, US3931349, US4035430, US4579999 are Mobil's early methanol-to-hydrocarbon patents, using a two-stage fixed-bed process, of which the first stage is methanol dehydration to dimethyl ether, and the di...

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Problems solved by technology

[0005] Patents US4402867 and US4480145 disclose that depositing amorphous silicon on ZSM-5 molecular sieve can improve the stability of the catalyst, but it will block some pores of the molecular sieve

Patents EP0571090, US5545791 and US5723401 disclose that loading metals or metal ions on a phosphorus-containing carrier can improve the gasoline selectivity of the catalyst. The metals include transition metals, alkali metals and alkaline earth metals. The carriers are aluminum phosphate, zinc phosphate and magnesium phosphate and other compounds, but the cost of the catalyst prepared by this method is high, and it is easy to coke and deactivate

Patents CN85100759A and CN10186813A disclose that one or more metal mixtures are added during the molecular sieve synthesis process, and then the catalyst is prepared by adding a binder after the molecular sieve is synthesized. Although this method is simple and quick, the metal components of the prepared catalyst are not dispersed. uniform, poor stability

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