Reduction state platinum-rhodium reforming catalyst

Abstract

The invention discloses a reduction state platinum-rhenium reforming catalyst. A preparation method is as follows: modifying an alumina carrier in an acidic water atmosphere, performing roasting to obtain a modified carrier, loading Pt, Re and Cl by impregnating, performing drying, performing roasting and then performing negative pressure and medium temperature drying, and performing acid-protected reduction treatment to obtain the reduction state platinum-rhodium reforming catalyst. In the preparation of the catalyst, the acid-protected reduction treatment is adopted, a reduction medium containing hydrogen chloride is injected into the system, hydrogen chloride is dissolved in the water of the system, and thus the water harmful to the dispersion of noble metal crystal particles can be transformed into the acid beneficial to the dispersion of the noble metal crystal particles, the high dispersion of the metal crystal particles can be protected, the good dispersion of the platinum-rhenium metal component in the catalyst can be maintained, and the activity of the catalyst is improved. The traditional two-step drying step is omitted, and the catalyst treatment procedure is saved, so that the catalyst preparation cost is reduced.

Description

technical field [0001] The invention relates to a reduced-state platinum-rhenium reforming catalyst and a preparation method thereof, belonging to the field of reforming catalysts. Background technique [0002] Catalytic reforming is an important production process. According to different catalyst regeneration methods, there are continuous reforming and semi-regenerative reforming. They are widely used in oil refining and chemical industry. In oil refining, its target product is high-octane gasoline; in chemical industry, its target product is aromatics, and their by-product is hydrogen. In recent years, with the increasing demand for high-octane gasoline and aromatics, the processing capacity of catalytic reforming units has increased year by year, of which semi-regenerative reforming units occupy an important position. [0003] Semi-regenerative reforming units use platinum-rhenium catalysts, which are characterized by good catalyst stability and can be operated for a lon...

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Problems solved by technology

[0006] There are two problems with this technology: one is that the reduction of metal oxides is too fast during high-temperature reduction, and the generated water rapidly increases the water content in the reduction medium, making the peak value of the water content in the reduction medium too high, increasing the risk of metal grain aggregation

Second, the drying process requires negative pressure and medium temperature drying, low oxygen nitrogen drying, high temperature oxygen-enriched nitrogen drying and other procedures, and the process is relatively complicated.

[0007] CN201310509928.9 adopts segmental reduction to reduce the peak value of water generated during the reduction process; although it reduces the harm of water, the harm cannot be completely solved

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