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We examined synthesis gas (H 2 and CO) production from CO 2 reforming of methane using a Co/oxidized diamond catalyst to investigate the properties of oxidized diamond as a support material and as a way to avoid carbon deposition on cobalt-loaded catalysts. Oxidized diamond showed a good catalytic performance among various support materials. No carbon deposition was observed when using the Co/oxidized diamond catalyst in CO 2 reforming of CH 4 . In addition, CH 4 conversion was maintained for 10 h during CO 2 reforming of CH 4 over the Co/oxidized diamond catalyst. In the CO 2 reforming of CH 4 , active cobalt species might be formed or deposited carbon would be rapidly eliminated on oxidized diamond-supported catalyst.