Regeneration method for coked iridium-containing catalyst

Abstract

The invention relates to a regeneration method for a coked iridium-containing catalyst. The regeneration method comprises the following steps of (1) two-stage scorching the coked iridium-containing catalyst with an oxygen-containing gas; and (2) performing water and chlorine balance treatment on the scorched catalyst, then performing water and chlorine activating treatment and the reducing. The method is simple in operations, and can completely recover performance of the coked catalyst.

Description

technical field [0001] The invention relates to a method for regenerating a carbon-deposited catalyst, in particular to a method for regenerating a carbon-deposited iridium-containing catalyst. Background technique [0002] Heavy aromatics generally refer to catalytic reforming, disproportionation and isomerization reactions to generate oil and C contained in ethylene cracking hydrogenated gasoline 9 -C 16 mono- and bicycloalkylaromatics. For a long time, heavy aromatic resources have not been rationally and fully utilized, except for a small amount used as solvent and extraction of C 9 、C 10 Except for monomeric aromatics, they are generally directly blended into gasoline pools as fuel. However, it is not advisable to directly use heavy aromatics as fuels from both economic and environmental point of view. On the one hand, heavy aromatics can be converted into light aromatics such as BTX; on the other hand, from the perspective of environmental protection, it has been ...

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Problems solved by technology

[0003] At present, the main methods for lightening heavy aromatics are pyrolysis and catalytic dealkylation. US5001296, US5990031, CN1048425C, CN1082539C, CN1472181A, CN1472182A, and CN200580009162 disclose a series of catalysts and processes for lightening heavy aromatics. The main disadvantages of these technologies are that the reaction temperature and pressure are high, and the space velocity is low, which limits the commercialization of the technology.

[0004] CN200610112737 discloses an Ir-containing monometallic catalyst for lightening the heavy components in the reformed oil and increasing the production of BTX. The catalyst has excellent C 9 + Lightening performance of heavy aromatics, but the regeneration of Ir-containing metal catalysts is relatively difficult, and the activity and selectivity of the catalyst decrease significantly after regeneration

[0005] The regeneration of Ir-containing catalysts has not been effectively solved due to the fact that Ir components are easy to aggregate and its redispersion is difficult.

People such as Huang [J.Catal.131,378-384 (1991)] have studied the regeneration problem that contains Ir catalyst, find that the redispersion of Ir catalyst has certain relation with the chlorine content of catalyst, but how to realize Ir component Efficient redistributing does not propose a specific method

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