Catalyst for deep desulfuration and octane number increase for gasoline and preparation and application methods thereof

Abstract

The invention discloses a catalyst for deep desulfuration and octane number increase for gasoline and preparation and application methods thereof. The functional catalyst comprises NiM / ZnO-ZSM-5. The preparation method comprises the steps of: firstly, synthesizing nanometer zinc oxide with high specific surface by using a low-temperature solid-phase method, then respectively steeping nickel and auxiliary metal, in the form of ions, onto the surface of the zinc oxide by using a steeping method, drying, roasting, and reducing in hydrogen to obtain a nanometer composite of the nickel, the auxiliary metal and the zinc oxide, wherein the nickel and the auxiliary metal are bonded in an alloy manner and uniformly disperse on crystalline phases of the zinc oxide. The catalyst has the reaction conditions that the reaction temperature is 350-450 DEG C, the pressure is 0.5-1.6MPa, the hydrogen-oil volume ratio is 100-300 and the air speed is 2<-10>h<-1>. By using the catalyst disclosed by the invention to treat straight-run gasoline, the deep desulfuration and the aromatization of alkane and olefin are performed at the same time, so that the octane number of a product gasoline is obviously increased.

Description

technical field [0001] The invention belongs to the method for converting sulfur-containing straight-run gasoline into a blending component of clean fuel with ultra-low sulfur content in the field of deep processing of petroleum products. Specifically, it is a catalyst for deep desulfurization of gasoline and raising octane number and its preparation and application method. Background technique [0002] With the development of the automobile industry and the improvement of environmental protection requirements, the popularization of domestic unleaded gasoline is accelerating, and low-octane straight-run gasoline is gradually eliminated. At the same time, due to the low olefin content of straight-run gasoline, increasing the octane number of straight-run gasoline Promote gasoline olefins to meet standards. The main device to increase the octane number of straight-run gasoline is catalytic reforming, and the reformer requires a large investment and is not suitable for sma...

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Problems solved by technology

[0008] The advantage of reactive adsorption desulfurization is that it can achieve ultra-deep desulfurization, and the sulfur content of the product can be reduced to below 10 μg / g. The problem is that the reaction must be carried out under hydrogenation conditions, and it is difficult to avoid the loss of octane number caused by olefin hydrogenation saturation. In addition, the purpose of aromatization modification cannot be achieved for straight-chain alkanes, olefins, and cycloalkanes, and the adsorption desulfurizer needs to be frequently regenerated; the advantage of the aromatization process is that it can make gasoline with a lower octane Alkanes and olefins are transformed into aromatics with high octane number, so as to achieve the purpose of increasing the octane number of product gasoline. The existing problems are that the catalyst is deactivated by carbon deposition and the reaction cycle is short. The rate is less than 50%, and the sulfur content in the product is difficult to meet the requirements as a blended gasoline component

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