Regeneration method of precious metal dehydrogenation catalyst

Abstract

The invention discloses a regeneration method of a precious metal dehydrogenation catalyst. The regeneration method mainly solves the problems that in the regeneration process of a light-alkane dehydrogenation catalyst, reactive metal accumulates and alkali metal is lost. The method comprises the following steps that 1, in hydrogen atmosphere, hydrogen supply solvent is used for treating a deactivated catalyst; 2, the deactivated catalyst treated in the step 1 is subjected to charking in mixed atmosphere containing low-concentration oxygen; 3, the deactivated catalyst treated in the step 2 is subjected to alkali metal additive supplementing treatment, and then roasted in air to obtain the regenerated catalyst. According to the regeneration method of the precious metal dehydrogenation catalyst, dehydrogenation activity of the regenerated catalyst can reach the level of a fresh catalyst, meanwhile, in the regeneration process, temperature changes little, operation is easy, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a regeneration method of a low-carbon alkane dehydrogenation catalyst, in particular to a regeneration method of a noble metal-based catalyst for propane and isobutane dehydrogenation. Background technique [0002] The shale revolution in North America has brought a large amount of low-carbon alkanes resources, resulting in the lightening of raw materials for ethylene crackers and a sharp drop in propylene production. At the same time, under the background of increasingly scarce petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw material sources, and it has gradually become a trend. Dehydrogenation of propane by-produced in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce propylene is an effective way to solve this problem. In recent years, the technology of propane dehydro...

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Problems solved by technology

When these two methods are used for catalyst regeneration, water vapor is introduced, which will not only cause the crystal phase transformation of the alumina carrier, but also cause the loss of alkali metal in the low-carbon alkane catalyst, and also cause metal aggregation to a certain extent.

[0008] It can be seen from the above regeneration methods of noble metal-based dehydrogenation catalysts that oxygen, halogen or water vapor are usually purposefully introduced during the regeneration process, although the problems of carbon deposition, metal accumulation and alkali metal loss are solved to a certain extent , but it often brings other side effects, and the above three problems cannot be taken into account at the same time, which inevitably results in the performance and life of the low-carbon alkane dehydrogenation regeneration catalyst

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