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Removal of carbonaceous matters over alumina supported chromium and platinum chromium catalysts Platinum, both alone and with a low and high amount of chromium as an additive supported on alumina, was studied as a catalyst. These catalysts were examined in the removal of the carbonizate as a model material. It was found that the 2Cr/Al 2 O 3  catalyst showed a significant increase in the catalytic activity as compared to 20Cr/Al 2 O 3 . An addition of platinum was found to cause a decrease of activity.