Regeneration method of catalyst for dehydrogenation of low-carbon alkanes

Abstract

The invention discloses a regeneration method of a catalyst for dehydrogenation of low-carbon alkanes, which comprises the following steps: firstly regenerating the catalyst in the air atmosphere at a lower temperature, burning out carbon deposits on the surface of the catalyst and most of carbon deposits in holes, and then preferably regenerating the catalyst further in a vapor-air mixed atmosphere at a temperature of 400-500 DEG C, so that the carbon deposits on the surface of the catalyst and in the holes can be completely removed, and simultaneously, the acid value and the acid distribution of the catalyst can be modulated so as to restore the crystal form and crystal phase composition of the deactivated catalyst to the original state of the fresh catalyst. Thus, the catalyst can be regenerated, and simultaneously, the physicochemical properties and the dehydrogenation activity of the regenerated catalyst are similar to those of the fresh catalyst, thereby prolonging the service cycle and life of the catalyst. The method has the advantages of moderate regeneration conditions and short regeneration time, and further lowers the production cost of the catalyst.

Description

technical field [0001] The invention relates to a regeneration method for a low-carbon alkane dehydrogenation catalyst, in particular to a regeneration method for propane dehydrogenation and butane dehydrogenation catalysts. technical background [0002] Since the beginning of the new century, human demand for the world's petrochemical raw materials and petrochemical products will continue to grow, and the demand for propylene as the basic petrochemical raw material will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand, making the market a global market. shortage. And with the increasing scarcity of petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw materials, especially the technical route of producing propylene with low-carbon alkanes as raw materials. In recent years, the technology of producing propylene from pr...

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Problems solved by technology

This method directly adopts the hydrothermal method, and regenerates at a higher regeneration temperature, the phenomenon of active metal aggregation is prone to occur, and the crystal form of the catalyst is also prone to change. In addition, there is also the problem that the regeneration time is too long, as shown in Example at least 24 hours in

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