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FT-IR evidence for the participation of protonic sites in the heterolytic cleavage of C?H bonds of methane over HZSM-5 zeolite |
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| Authors: | Laiyuan Chen Liwu Lin Qin Xin Pinliang Ying Mojie Cheng Zhusheng Xu and Tao Zhang |
| Institution: | (1) Laboratory of Catalysis by Metals and New Materials Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P. O. Box 110, 116023 Dalian, P.R. China;(2) State Key Laboratory for Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, 116023 Dalian, P.R. China |
| Abstract: | It has been observed by FT-IR spectroscopy that both kinds of Brönsted acid protons present in HZSM-5 zeolite may be involved in the adsorption of methane at low temperature (173 K) and exchange with CH4 or CD4 at high temperature (>500°C). The sites which can adsorb methane at low temperature are the active sites for methane conversion at high temperature. Over HZSM-5 zeolite, the activation of methane is suggested to occur via a heterolytic cleavage of C–H bond with the assistance of protons. |
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