O.O.O.O.O.O.[N+]([O-])([O-])=[O:8].[Co+2:11].[N+]([O-])([O-])=[O:13].O.O.O.O.O.O.O.O.O.[N+]([O-])([O-])=[O:26].[Al+3:29].[N+]([O-])([O-])=[O:31].[N+]([O-])([O-])=[O:35].C(=O)([O-])[O-].[NH4+].[NH4+]>O>[O-2:8].[O-2:13].[O-2:26].[O-2:31].[O-2:35].[Al+3:29].[Al+3:29].[Co+2:11].[Co+2:11]In 300 ml of pure water were dissolved 29 g of cobalt nitrate hexahydrate and 75 g of aluminum nitrate nonahydrate. A solution of 38.4 g of ammonium carbonate dissolved in 100 ml of pure water was gradually added thereto with stirring to form a gel-form precipitate. The precipitate was washed with pure water three times, dried at 100° C. overnight and calcined at 600° C. in an air stream. The calcined material was then calcined at 800° C. in a muffle furnace for 3 hours to a cobalt aluminate catalyst having a blue color.
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