Oxidative dehydrogenation of butene

Selective Oxidative Dehydrogenation of Butenes on Ferrite Catalysts... 

Oxidative dehydrogenation of butene 573-648 a-Fe203, a-Fe203/Si02 Selectivity for butadiene increases with decreasing Fe2Q3 crystallite size 54... 

Table II. Oxidative dehydrogenation of butene to butadiene on ZnFe204 and a 50/50 mixture of ZnFe204 + a-Sb204...

Molybdate based scheelites have been intensively studied in this respect, one reason being that they are found with molybdenum in both the penta- and hexavalent state. Bismuth molybdates in particular are useful catalysts for selective oxidation of propylene to acrolein, propylene ammoxidation to acrylonitrile and the oxidative dehydrogenation of butene to butadiene. 

On the basis mainly of results obtained in the oxidation of isobutene to methacrolein, the oxidative dehydrogenation of butene to butadiene and the oxygen-aided dehydration of formamide to nitriles, it was possible to show that oxides present in catalysts are located on a scale reflecting donor-acceptor properties (fig. 5). Some oxides are essentially acceptors (e.g., M0O3, some tellurates) they can potentidly cany active and selective sites, provided they receive spillover oxygen. Others are essentidly donors a-Sb204, in this respect, is typical it produces spillover oxygen but carries no sites active for oxidation. Other oxides have mixed properties. The acceptors are relatively covalent, the donors are more ionic [63,77]. 

Derivation (1) Catalytic dehydrogenation of butenes or butane (2) oxidative dehydrogenation of butenes. 

This article therefore seeks to examine in depth just one mixed oxide catalyst, tin-antimony oxide, which has been commercially developed (2-5) for the oxidation of propylene to acrolein as well as for the ammoxidation of propylene to acrylonitrile and the oxidative dehydrogenation of butenes to 1,3-butadiene. A recent book (6) and a subsequent review (7) have shown how little unanimity has been established about the fundamental properties of the material. In particular there seems to be much confusion as to the phase composition, the nature of the cationic oxidation states, the chemical environment of the cations, the charge compensation mechanism, the nature of the active sites, the distortion of the host tin(IV) oxide lattice by the dopant antimony atoms and whether any changes in the catalyst result from the adsorption and catalytic processes. 

However, as with other aspects of this catalyst, there is little unanimity as to the significance of specific cationic oxidation states in the formation of active sites. Indeed, Roginskaya et al. (11) reported that the catalytic activity for the oxidative dehydrogenation of butenes and ammoxidation of... 

The H2S-promoted oxidative dehydrogenation of butene was studied by Vodekar and Pasternak [12]. Typical run conditions were 970°F, 1 atm, AI2O3 catalyst with 20 m /g, a gas feed with IH2S, 0.7502, and 2.8N2 per mole C4H8. At a butene hourly space velocity of 300 hr , the butene conversion was 83% and the butadiene yield 44%. 

Oxidative Dehydrogenation of Butene to Butadiene To Student Team Blue ... 

The fundamentals of the use of infrared spectroscopy in the research on solid oxidation catalysts are briefly summarized. The application of IR to a number of case studies is reported they include methanol partial and total oxidation and steam reforming, CO oxidation and water gas shift, methylaromatics selective oxidations, oxidative dehydrogenation of butenes to butadiene, total oxidation of halide hydrocarbons and oxygenates, selective catalytic reduction of NOx. 

Gibson, M. and Hightower, J. (1976). Oxidative dehydrogenation of butenes over magnesium ferrite kinetic and mechanistic studies, J. Catal, 41, pp. 420 30. 

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