Composite catalyst for catalytic modification of methanol gasoline, method for preparing same and application thereof

Abstract

The invention provides a composite catalyst for catalytic modification of methanol gasoline. Oxides, and / or phosphides, and / or silicides, and / or borides of one or more of Cr, W, Mo, Co, Ni, Zn, Cd, Cu, Pt, Sn, Sb, Zr and Sr elements are taken as active components to be loaded on a porous carrier to prepare the catalyst. According to elements, the active components account for 0.5 to 3 percent of the weight of the catalyst carrier. The catalyst can also load an auxiliary catalyst which is oxides of one or more of K, Mg and Mn, and according to elements, the auxiliary catalyst accounts for 0.2 to 1.5 percent of the weight of the catalyst carrier. The catalyst is prepared by the isometric immersion method, and mainly applied to low-proportion methanol gasoline, optimally the catalytic modification of two types of methanol gasoline of M15 and M30.

Description

technical field [0001] The invention relates to the technical field of methanol gasoline modification, in particular to a composite catalyst capable of catalytic modification of methanol gasoline, and also relates to a preparation method and application of the composite catalyst. Background technique [0002] Methanol fuel is mainly made by mixing industrial methanol and existing refined oil according to a certain proportion through corresponding deployment process. If industrial methanol is directly blended with refined oil in a certain proportion without using any additives, it will result in poor miscibility during the use of methanol fuel, easy occurrence of air resistance, corrosion, and difficulty in starting at low temperature during driving in high temperature seasons. The problem of poor dynamics and so on. The general way to solve these problems is to modify methanol gasoline according to a certain deployment method by adding composite additives. [0003] However...

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Problems solved by technology

The catalyst has strong acidity and high catalytic activity, but the MTBE selectivity is poor; and the medium strong acid center is the best acid center for etherification reaction

[0011] Zhu Jianhua et al. (Acta Petroleum Sinica (Petroleum Processing), 1998, 14(1): 46-51) loaded MoCl on HZSM-5 zeolite 5 Afterwards, the reaction process of methanol to gasoline (MTG) was studied, and it was found that the migration of A1 from the outer surface to the inner surface occurred on the surface of HZSM-5, resulting in catalyst deactivation.

[0012] As mentioned above, so far, in the prior art, only one or two components between the volatile components methanol, low-carbon olefins, benzene, toluene, xylene and some low-carbon isoparaffins in methanol gasoline have been carried out. There is no report on the comprehensive and comprehensive catalytic modification of the components volatilized by methanol gasoline in the high temperature season as a whole.

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