Regeneration of spent supported metal catalysts

Details Regeneration of spent supported metal catalysts Regeneration of spent supported metal catalysts

2005-06-21

2005-06-21

Nguyen, Cam N. (Department: 1754)

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

C502S028000, C502S031000

Reexamination Certificate

active

06908873

ABSTRACT:
A method for regenerating spent supported metal catalysts comprising treating the spent catalyst with an organo-metallic complex forming agent having an ionization constant pK1of at least 2.5. The catalyst activity is restored to an activity level near to or greater than the fresh catalyst. The regeneration method is particularly useful for regenerating spent palladium catalysts on an alumina support as utilized for the hydrogenation of ethyl anthraquinone (EAQ) in the production of hydrogen peroxide.

REFERENCES:
patent: 4366085 (1982-12-01), Ikegami et al.
patent: 4999326 (1991-03-01), Sikkenga et al.
patent: 6005155 (1999-12-01), Sun
patent: 6239054 (2001-05-01), Shukis et al.

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