Gasoline selective desulfurization catalyst

Abstract

The invention aims to provide a gasoline selective desulfurization catalyst, and particularly relates to an FCC gasoline selective desulfurization catalyst. The catalyst is prepared by mixing a molecular sieve and a binder, forming the mixture to obtain a carrier and loading active metal ingredient and alkaline metal and / or rare-earth metal to the carrier, wherein the molecular sieve in the carrier is SAPO and / or APO molecular sieve; the binder is aluminum oxide or silicon dioxide; the active ingredient is cobalt-molybdenum composite metal and accounts for 6.5 to 20 weight percent of the catalyst, the alkaline metal and / or the rare-earth metal ingredient account(s) for 0.05 to 8.0 weight percent of the catalyst, and the balance is the carrier; and the relative mass ratio of the molecular sieve to the binder in the carrier is (5-9):(1-5). The catalyst has high hydrodesulfurization activity and selectivity and low olefin saturation ratio when gasoline with low sulfur content is produced by hydrodesulfurization of all fractions of catalytic gasoline, particularly heavy fractions.

Description

technical field [0001] The invention relates to the technical field of clean fuel production in petrochemical industry, in particular to a selective hydrodesulfurization catalyst for producing clean gasoline with low sulfur content by hydrodesulfurization of FCC gasoline. Background technique [0002] With the continuous development of the world economy, the acceleration of urbanization and the continuous improvement of people's living standards, vehicle exhaust has become one of the main sources of air pollution. With the increasing attention to environmental issues, in order to protect the environment on which human beings depend, governments of various countries have formulated stricter environmental protection regulations. my country has implemented the National III gasoline standard on January 1, 2010, and the sulfur content in gasoline has been reduced to below 150 μg / g; Beijing and other places have implemented the National IV gasoline standard since 2008, and it will...

AI Technical Summary

Problems solved by technology

[0005] US 4032632 discloses a MgO-supported cobalt-molybdenum catalyst, which can retain some olefins when used for FCC gasoline desulfurization, thereby reducing the decline in octane number, but the desulfurization rate is low and the mechanical strength is not high

[0006] CN 1335361A discloses a FCC gasoline selective desulfurization catalyst and its preparation method, which has better selectivity than the traditional hydrodesulfurization method, when the desulfurization rate is 70%, the olefin saturation rate is 16%, and the octane number loss of the research method is 2.9 unit, but when the desulfurization rate is further increased, the olefin saturation rate will increase accordingly