METHOD OF REGENERATING FLAVOURING CATALYST USING DECOKING STEP BETWEEN STEPS OF ADDING CHLORINE AND FLUORINE Russian patent published in 2020 - IPC B01J38/42 B01J32/00 B01J38/12 B01J38/46 B01J38/48 B01J29/90 B01J29/62 C10G35/06 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of spent catalyst regeneration. Described is a method of recovering a spent catalyst containing a transition metal of group 8–11 and a catalyst support, involving: (1) contacting the catalyst with a chlorine-containing stream containing a chlorine-containing compound in a gas phase to obtain a chlorinated spent catalyst; (2) contacting chlorinated spent catalyst with a coke burning gas stream containing oxygen to obtain a decanted catalyst; (3) contacting the decanted catalyst with a fluorine-containing solution containing a fluorine-containing compound in a liquid phase to obtain a fluorinated catalyst; and the catalyst support includes a zeolite with large pores, having average pore diameter of about 7 to about 12 Å.

EFFECT: technical result is improved methods of reducing catalytic activity of spent catalysts.

41 cl, 3 ex, 2 tbl, 8 dwg