Novel composite solid acid catalyst and application

Abstract

The invention is to load heteropoly acid and transition metal oxide on nano HZSM-5 zeolite to form a composite solid acid catalyst. The composite solid acid catalyst is an effective catalyst for dimethyl ether prepared by methyl alcohol gas phase dehydration and through a synthesis gas one-step method and fuel modification and desulfuration. In the reaction of preparation of dimethyl ether by methyl alcohol gas phase dehydration, when the reaction temperature is lower than 200 DEG C, the mol conversion rate of the methyl alcohol is higher than 85 percent, and the mol selectivity of the dimethyl ether is higher than 99.5 percent. In the reaction of preparation of dimethyl ether through the synthesis gas one-step method, the conversion rate of the CO is higher than 80 percent, the selectivity of the dimethyl ether in the organic substance is higher than 50 percent, and the selectivity of the methyl alcohol is lower than 2 percent. In modification and desulfuration of the FCC oil products, the desulfurization rate is higher than 50 percent; meanwhile, the olefinic content of the oil products is reduced, which improves the content of isoalkane.

Description

technical field [0001] The invention relates to a preparation method of heteropolyacid / nano ZSM-5 composite solid acid catalyst and its application in gas-phase dehydration of methanol to produce dimethyl ether, synthesis gas to produce dimethyl ether in one step, and gasoline modification and desulfurization. Background technique [0002] All countries in the world are actively engaged in the development and application of dimethyl ether and its downstream products, therefore, the potential market of dimethyl ether is huge. DME can be used as an industrial fuel, and can be burnt alone or mixed with liquefied gas, alcohol, and hydrocarbons, and can also be mixed with city gas or natural gas to achieve clean combustion. DME can also replace chlorofluorocarbons as aerosols, refrigerants and blowing agents to reduce air pollution. [0003] Dimethyl ether was first produced by rectification of by-products in high-pressure methanol production, and soon developed into two process...

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Problems solved by technology

[0016] From the above studies, it can be seen that the reaction temperature of gasoline modified desulfurization with ZSM-5 as the active component is as high as 350 ° C, which increases the energy consumption of production and is not conducive to the formation of branched chain isoparaffins