Method for regenerating spent catalyst

B - Operations – Transporting – 01 – J

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B01J 38/60 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01D 53/96 (2006.01) B01J 21/16 (2006.01) B01J 21/20 (2006.01) B01J 38/48 (2006.01) B01J 38/62 (2006.01)

Patent

CA 2692308

[PROBLEMS] To provide a method of regenerating a catalyst in which not only is the SO2 oxidation ratio of denitration catalyst raised by compounds of Fe, V, etc. lowered to an extremely low level but also the oxidation activity of metallic mercury of the catalyst can be enhanced by regeneration treatment. [MEANS FOR SOLVING PROBLEMS] The method of regenerating a catalyst comprises the steps of impregnating a used denitration catalyst composed mainly of titanium oxide with (a) a mixed aqueous solution containing phosphate ions and oxo acid ions of at least one element selected from among vanadium (V), molybdenum (Mo) and tungsten (W), or (b) an aqueous solution of heteropolyacid compound from phosphorus and at least one element selected from among V, Mo and W, or (c) a mixed aqueous solution of phosphate compound and vanadyl compound, and thereafter carrying out drying.

L'invention concerne un procédé de régénération d'un catalyseur dans lequel non seulement le taux d'oxydation en SO2 du catalyseur de dénitration augmenté par les composés de Fe, V, etc. est abaissé à un niveau extrêmement bas, mais encore l'activité d'oxydation du mercure métallique du catalyseur peut être améliorée par un traitement de régénération. Le procédé de régénération du catalyseur comprend les étapes d'imprégnation d'un catalyseur de dénitration usagé principalement composé d'oxyde de titane avec (a) une solution aqueuse mixte contenant des ions phosphate et des ions oxoacides d'au moins un élément choisi parmi le vanadium (V), le molybdène (Mo) et le tungstène (W), ou (b) une solution aqueuse d'un composé hétéropolyacide du phosphore et au moins un élément choisi parmi V, Mo et W, ou (c) une solution aqueuse mixte d'un composé phosphate et d'un composé vanadyle, puis de mise en oevre d'un séchage.

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