Lithium-doped sulfated-zirconia catalysts for oxidative coupling of methane to give ethylene and ethane |
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Authors: | Kazuhisa Murata Takashi Hayakawa Satoshi Hamakawa Kunio Suzuki |
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Affiliation: | National Institute of Materials and Chemical Research, Tsukuba Ibaraki 305 Japan |
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Abstract: | Li-doped sulfated-zirconia catalysts were found to be effective for oxidative coupling of methane (OCM). The catalyst performances depend on the sulfate content and calcination temperature. A maximum C2 yield is attained over the catalysts, which contain 6 wt.% sulfate and calcined at 923–973 K, being closely related to the preparation conditions of sulfated-ZrO2 as solid super-acids. When the performances of the Li-doped sulfated-ZrO2 (Li/SZ) catalysts were tested at 1023 K as a function of reaction time, both the C2 and COx selectivities remained constant over the range of 8 h, but the CH4 conversion decreased from 17.5% to 11.9%. The nature of Li/SZ catalysts for the OCM was investigated by X-ray diffraction, XPS, and NH3 and CO2 TPD measurements. It could be postulated that the sulfated-ZrO2 surface could play an important role in the formation of a catalytically active structure by Li-doping. |
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Keywords: | Oxidative coupling Methane Ethylene Neutralization of sulfated zirconia Lithium doping |
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