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    STUDIA CHEMIA - Issue no. 1-2 / 1998  
         
  Article:   PHYSICOCHEMICAL CHARACTERIZATION OF ALUMINA-SUPPORTED COBALT AND MOLYBDENUM MIXED OXIDES I. TEMPERATURE-PROGRAMMED REDUCTION (TPR) AND OXIDATION (TPO) STUDIES.

Authors:  FLORIN PĂTCAŞ, FLORINA BUCIUMAN. 		 
       
         
  Abstract:  Two series of Co-Mo-O/-Al2O3 catalysts having various metal loading and different Co:Mo atomic ratios were prepared by incipient wetness impregnation. The reducibility and reoxidability of reduced samples were investigated by means of TPR/TPO techniques. Three cobalt species were found: Co3O4, isolated Co3+ or Co2+ cations on the surface of alumina and CoAl2O4, while molybdenum forms a single species whose redox properties are influenced by the support at lower loading. The presence of molybdenum stabilises the isolated Co2+ and Co3+ species towards reduction.  
         
     
         
         
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