Iron-molybdenum oxide catalyst studies

Iron bismuth molybdenum oxides have been studied by Linn and Sleight [188] and Batist et al. [44], The latter studied catalysts con-... 

A study has been undertaken to compare the effectiveness of molybdenum and uranium oxide and iron sodalite catalysts with the homogeneous gas-phase oxida-hon of methane [54]. Catalyst performance was evaluated in a high-pressure annular reactor and data were compared to the reactivity of the empty reactor. It was concluded that none of the catalysts gave any advantage over the homogeneous reaction. Indeed, using a catalyst only reduced the selectivity to the desired partial oxidation products. Similar conclusions have been reached for many catalysts used for the partial oxidation of methane, and therefore it is perhaps not surprising that uranium oxide catalysts are no different... 

In the previous sections of this review, it has been shown that most effective catalysts for the selective oxidation of propylene contain at least two types of metal oxides—an amphoteric or low-valence oxide, such as bismuth, tin, iron, or cobalt, and an oxide of a high valence metal, such as molybdenum or antimony. Moreover, it has been suggested several times that each of these metal oxide components may give rise to an active site for example, propylene may adsorb on an active site associated with one of the metal oxide components, and oxygen may adsorb on an active site associated with another metal oxide component. This problem has been studied using spectroscopic, adsorption, and kinetic techniques. It now seems appropriate to consider some of these studies in detail, attempting to relate the solid structure of the catalyst to the active sites wherever possible. 

Petrini, G., F.Gaibasa, M. Petrera and N. Pemicone, Study of Iron(II) Molybdate as Precursor of Catalysts for Methanol Oxidation to Formaldehyde , in Chemistry and Uses of Molybdetmm, Ed. H. F. Barry and P. C. Mitchell, p.437. Climax Molybdenum Company, Ann Arbor, Michigan, USA (1982). 

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