Hydrogen induced catalysis by silver-exchanged zeolites: transformation of ethylbenzene over AgY zeolite |
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| Affiliation: | 1. Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;2. Press Kogyo Co., Ltd., 1-1-1 Shiohama, Kawasaki 210-8512, Japan |
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| Abstract: | Catalytic activity of AgY at 473 K is greatly enhanced by the presence of hydrogen. Activity in the presence of hydrogen is much higher than that observed for HY, where the presence of hydrogen has no effect. The effect caused by hydrogen is reversible. When hydrogen is removed from the system, activity decreases. Activity is restored by the re-introduction of hydrogen into the system. This shows that hydrogen is reversibly chemisorbed to form protons in the zeolite. It is suggested that the interconversion of hydrogen molecules and protons is related to the redox property of the small silver clusters. |
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