L molecular sieve-containing catalytic gasoline selective hydrodesulfurization modification catalyst

Abstract

The invention relates to an L molecular sieve-containing catalytic gasoline selective hydrodesulfurization modification catalyst. A carrier is a composite carrier consisting of alumina and an L molecular sieve; Co or / and Ni metal and Mo or / and W metal active components are loaded; alkali metals, alkaline-earth metals, rare-earth elements, transition metals and non-metals are compounded to obtain a modifier; the L molecular sieve accounts for 10 to 70 percent of the total weight of the carrier; and based on the total weight of 100 percent of the catalyst, the active component Mo or / and W accounts for 2.0 to 30 percent of the total weight of the catalyst based on the weight percentage of an oxide, the active component Co or / and Ni accounts for 0.1 to 10.0 percent of the total weight of the catalyst based on the weight percentage of the oxide, the modifier accounts for 1 to 10 percent of the total weight of the catalyst and the carrier accounts for 60 to 93 percent of the total weight of the catalyst. Therefore, the desulfurization degree of catalytic gasoline is no less than 80 percent, the volume content of olefin is lowered to be less than 25 percent and the octane number of a product is no less than 1.5 units compared with that of raw oil.

Description

technical field [0001] The invention relates to a catalytic cracking (FCC) gasoline selective hydrodesulfurization and upgrading catalyst used in the production of clean gasoline in the petroleum refining process. Background technique [0002] At present, urban air pollution caused by vehicle exhaust emissions is becoming more and more serious. For example, the "contribution rate" of vehicle emissions to air pollution in Beijing has reached 40-50%. In order to control the air pollution caused by automobile exhaust emissions, countries all over the world have formulated strict gasoline standards (as shown in Table 1). In order to adapt to WTO rules, my country's automotive gasoline standards are also constantly in line with international standards. The newly launched National IV gasoline vehicle emission standards require that the sulfur content be less than 50 μg·g -1 , the volume content of olefins is lower than 25.0%, and gradually approaches the European oil standard IV....

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Problems solved by technology

[0012] The purpose of the present invention is to develop a catalyst containing L molecular sieve, so that it has balanced hydrodesulfurization, olefin reduction, and octane number maintenance performance, so as to solve the problem of poor comprehensive performance of existing catalytic cracking gasoline upgrading and modifying catalysts question

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