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HETEROGENEOUS PHOTO CATALYSIS–VII. THE INFLUENCE OF ZINC IONS ON THE PHOTOCATALYTIC PROPERTIES OF PLATINIZED CADMIUM SULFIDE
Author(s) -
Hetterich Wolfgang,
Kisch Horst
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb08659.x
Subject(s) - zinc , chemistry , catalysis , cadmium sulfide , photocatalysis , platinum , aqueous solution , cadmium , sulfide , inorganic chemistry , zinc sulfide , sulfate , ion , nuclear chemistry , organic chemistry
— The reaction rate of the CdS/Pt‐catalyzed hydrogen evolution and photodehydro‐dimerization from aqueous 2,5‐dihydrofuran depends strongly on the reaction conditions in the preparation of CdS/Pt by photoplatinization. Highest rates, 12 ml H 2 /h, are obtained when the photocatalyst was prepared with a low‐intensity lamp in the presence of 4.3 mol% of platinate (sample I) while lower rates are observed with 1.07, 2.15, 3.23 and 6.45 mol% Pt. At higher intensity and 4.3 or 2.15 mol% Pt the produced samples II and III induce rates of 5 or 2.5 ml H 2 /h. Addition of zinc sulfate to the 2,5‐dihydrofuran solution results in a maximum rate increase to 7.5 and 12.5 ml H 2 /h in the case of II and III , respectively. Similarly, zinc sulfate improves the catalytic properties also when it is present during photoplatinization. In this case only half the amount of platinum, 2.15 mol%, is necessary to obtain the highest rates of 12 ml H 2 /h.