Web Release Date: June 20,
Synthesis Gas Production from Methane Using Oxidized-Diamond-Supported Group VIII Metal Catalysts
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National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba, Ibaraki, 305-0044, Japan, Department of Chemical Engineering, and High Technology Research Center, Kansai University, Suita, Osaka 564-8680, Japan, Institute of Applied Physics and Center for Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan, Special Division for Green Life Technology, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan, and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST) and National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
Received January 9, 2003
Abstract:
We performed partial oxidation, steam reforming, and CO2 reforming of CH4 to synthesis gas, using oxidized-diamond-supported group VIII metal catalysts, to investigate the properties of oxidized diamond as a support material and to avoid carbon deposition on a metal-loaded catalyst. Nickel (5 wt %)/oxidized diamond afforded the highest CH4 conversion of 24% (CH4/O2 = 5), giving CO and H2 at 873 K for the partial oxidation of CH4. No carbon deposition was observed with a supported oxidized-diamond catalyst (5 wt % nickel loading level) in the partial oxidation of CH4 at >923 K. In the steam reforming of CH4, ruthenium (5 wt %)/oxidized diamond afforded a CH4 conversion of 63% (CH4/H2O = 0.33), giving CO and H2 at 873 K. Nickel, palladium, ruthenium, and rhodium (5 wt %)/oxidized diamond showed high catalytic activities for CO2 reforming of CH4 (CH4/CO2 = 1) at 873 K.
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