Kinetics of Heterogeneous and-or Homogeneous Catalytic Decomposition of Hydrogen Peroxide by Some Metal Vanadates and Their Primary Oxide MixturesReportar como inadecuado




Kinetics of Heterogeneous and-or Homogeneous Catalytic Decomposition of Hydrogen Peroxide by Some Metal Vanadates and Their Primary Oxide Mixtures - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Croatica Chemica Acta, Vol.64 No.2 October 1991. -

A study of the kinetics of catalytic decomposition of H2O2 by some metal M vanadates and their primary oxide mixtures, where M=Mg, Ca, Ni, Cu and Cuo.5+Mgo.5 for catalysts J-V, respectively, reveals that the decomposition reaction is homogeneous for catalysts - and IT, whereas for Iff—V the early stages of the reaction are mainly heterogeneous. However, whenever the vanadium, nickel or copper ions go into solution, in the form of the peroxo compounds of vanadiumV, they catalyze the reaction homogeneously at relatively low decomposition rates. Significance of the concept of bivalent catalytic centres towards enhancement of the catalyst activity has been established. It was found that the parameter which best characterizes the intrinsic order of catalytic activity is the activation entropy of the reaction and not the activation energy deduced. The activity order of catalysts I—V calcined in air at 500, 700 and 1000 °C for 5 hours was found to be IV>V>III>II>I.



Autor: M. M. Girgis - ; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt R. M. Gabr - ; Chemistry Department,

Fuente: http://hrcak.srce.hr/



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