| Abstract: | Abstract Fourteen models of the Hougen–Watson type were developed and tested for hydrodesulphurization (HDS) of benzothiophene and thiophene, which form the major part of sulphur usually present in residual oils. Model discrimination based on the positiveness of the rate and equilibrium constants, revealed that four of the models satisfied the set criteria. One of these models corresponds to that proposed by Kilanowski and Gates (1980] Kilanowski and Gates, B. C. 1980. Kinetics of Hydrodesulphurization of Benzothiophene catalysed by sulphide Co-Mo/AI203. Journal Catalysis, 62: 70–78. Google Scholar]) for benzothiophene and the one derived by Satterfield and Roberts (1968] Satterfield, C. N. and Roberts, G. W. 1968. Kinetics of hiphene Hydrogenolysis on Cobalt Molybdate Catalyst. A. I. Ch. E. Journal, 14: 159Crossref], Web of Science ®] , Google Scholar]) for thiophene. A new model, which was determined by variance function analysis, suggests that the HDS of both benzothiophene and thiophene assumes a dual site mechanism and is first order in sulphur compound and second order in hydrogen. |
