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We have studied the effect of ball milling on alumina mixed nickel, magnetite and Raney nickel on the reaction: 2NaOH(s) + CO (g) = Na2CO3 (s) + H2 (g) and determined the optimum particle size for the catalysts. The best performance was shown by a 2 h ball milled Raney nickel with average crystallite size of 209 Å. This reaction serves the dual purpose of carbon sequestration and yielding hydrogen gas.
Kumar, S.; Drozd, V.; Saxena, S.K. Catalytic Studies of Sodium Hydroxide and Carbon Monoxide Reaction. Catalysts 2012, 2, 532-543.