Chemistry

3rd World Congress on Oxidation Catalaysis, Proceedings of by R.K. Grasselli, S.T. Oyama, A.M. Gaffney and J.E. Lyons

By R.K. Grasselli, S.T. Oyama, A.M. Gaffney and J.E. Lyons (Eds.)

The third global Congress on Oxidation Catalysis has its roots within the ecu Workshop on Selective Oxidation held in Louvain, Belgium in 1985. Out of this workshop grew the first international Congress held in Rimini, Italy in 1989. the second in Benalmadena, Spain in 1992, and the third being held now in 1997 in San Diego, California, united states. Out of the small center of devoted and enthusiastic scientists assembled in Louvain in 1985, grew now a vast base of scientists and technologists from academia, and executive laboratories who're fervently pursuing the topic of oxidation catalysis and are keen and prepared to switch their findings on the present assembly. the final subject of the third international Congress is ''Atom effective Catalytic Oxidations for international Technologies''. We selected this subject matter to stimulate the contributors to file their findings with an emphasis on holding priceless fabric of their catalytic differences, in addition to retaining strength, and that during an environmentally accountable demeanour. development in the direction of this said aim is big as evidenced by means of the great reaction of our neighborhood of their participation of caliber guides compiled in those lawsuits of the Congress.

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Figure 5 shows that increasing amounts of iron led to a progressive increase in the isobutane conversion and yield to methacrolein plus methacrylic acid, while the selectivity was negatively affected by the dopant. It is known that the nature of the cation may affect the redox properties of the molybdenum in the primary structure, and this might explain the progressive increase in catalytic activity. However, the addition of iron also was found to increase the Broensted and Lewis acidity of the compound; this acidity might be involved in the rate-determining step of the reaction, facilitating the polarization of the C-H bond.

10 OROCARBON...... I . . ~'~~ REDOX CATALYTIC oXIDATION OF HYDROCARBON MOLECULE CANNOT PROCEED, BECAUSE THE MOLECULE IS NOT ACTIVATED ] CATALYTIC OXIDATION OF H Y D R O C A R B O N MOLECULE CANNOT PROCCED BECAUSE THE CATALYST IS NOT REOXIDIZED Figure 2: The transfer of electrons across the adsorbate/oxide interface in the course of the heterogeneous catalytic oxidation of a hydrocarbon molecule by gas phase oxygen. The probability of these processes is a function of the density of states in the conductivity and valence band respectively at the potentials corresponding to the redox potential of the adsorbed species.

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