Novel photocatalyst, preparation therefor and method for...

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B01J 27/04 (2006.01) B01J 23/78 (2006.01) B01J 27/043 (2006.01) B01J 35/00 (2006.01) C01B 3/04 (2006.01)

Patent

CA 2229340

The present invention relates to a novel photocatalyst for producing hydrogen, harmless to the environment and by which a large quantity of hydrogen is efficiently produced at low temperatures without using any organic promoter, represented by the following formula: Cs(a)X(c)/T(b) wherein "a" represents a percentage by weight of impregnated Cs on the basis of the weight of a carrier, being limited up to 6.0; "X" is a promoter selected from Ni, Co and Fe; "c" represents a percentage by weight of the promoter on the basis of the total weight of Cs and the promoter, being limited up to 50.0; "T" is the carrier consisting of a zinc sulfide mixture comprising an inorganic compound and zinc sulfide with the molar ratio of zinc:sulfur ranging from 1:0.1 to 1:2.8; and "b" represents a percentage by weight of the inorganic compound on the basis of the total amount of the ZnS mixture, being limited up to 50. Also, the present invention relates to a method for preparing the photocatalyst and to a method for producing hydrogen using the photocatalyst.

L'invention porte sur un nouveau photocatalyseur servant à produire de l'hydrogène, sans danger pour l'environnement et au moyen auquel une grande quantité d'hydrogène est produite efficacement à basse température, sans utilisation de promoteur organique actif. Ce photocatalyseur est représenté par la formule (s(a)H(c)/s(b), où "a" représente un certain pourcentage en poids de Cs imprégné, déterminé sur la base du poids d'un support et inférieur ou égal à 6,0; "H" est un promoteur choisi parmi Ni, Co et Fe; "c" représente un pourcentage en poids du promoteur, déterminé sur la base du poids total de Cs et du promoteur et inférieur ou égal à 50,0; "S" est le support, constitué d'un mélange de sulfure de zinc contenant un composé inorganique et du sulfure de zinc, le rapport molaire zinc/sulfure étant compris entre 1/0,1 et 1/2,8; et "b" représente un pourcentage en poids du composé inorganique, déterminé sur la base de la quantité total du mélange ZnS et inférieur ou égal à 50. L'invention porte également sur un procédé de préparation du photocatalyseur et sur un procédé de production d'hydrogène utilisant ledit photocatalyseur.

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