Vulcanization method of selective hydrodesulfurization catalyst of FCC (Fluid Catalytic Cracking) gasoline

Abstract

The invention discloses a vulcanization method of a selective hydrodesulfurization catalyst of FCC (Fluid Catalytic Cracking) gasoline. The method is as follows: in a vulcanization process of the selective hydrodesulfurization catalyst, first vulcanizing under a low pressure and at a low temperature, then vulcanizing under a high system pressure and at a high temperature so as to facilitate production of more CoMoS phases and make the CoMoS phases more dispersive to produce more sulfur vacancies and form more desulfurization centers and promote the formation of the active center of direct desulfurization. The vulcanization method can improve the catalyst desulfurization activity, at the same time, and the olefin saturation properties basically remains unchanged, so that the hydrodesulfurization selectivity of the FCC gasoline is effectively improved. The method can be applied to a variety of hydrodesulfurization catalysts of the FCC gasoline, and is especially suitable for hydrodesulfurization catalysts containing additives with selective desulfurization effect.

Description

technical field [0001] The invention relates to a method for vulcanizing an FCC gasoline selective hydrodesulfurization catalyst, in particular to a method for starting the vulcanization of a hydrodesulfurization catalyst containing a selective desulfurization effect additive. Background technique [0002] With the increasingly stringent environmental protection regulations, developed countries and regions represented by the European Union and the United States have stricter requirements on vehicle exhaust emissions, and have successively issued relevant policies to formulate strict fuel oil quality standards, especially for gasoline products. Sulfur and olefins have strict limits. In 2006, the European Parliament passed Euro IV and Euro V vehicle emission standards. These two standards have more stringent restrictions on vehicle pollutant emissions, especially for dust particles and nitrogen oxide emissions, and the limit requirements have dropped significantly. For the s...

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Problems solved by technology

[0008] The design of the vulcanization pressure in the above patents is carried out under the reaction pressure conditions, and none of them involves the influence of the vulcanization pressure on the activity and selectivity of the catalyst.