| Popis: |
Activities and product distributions in thiophene hydrodesulfurisation at 523–673K and 1 atm over Mo/A1203 catalysts promoted by Ru, Co, Ni and Co-Nb/Al2O3 and Ni-V/A12O3 catalysts are described. The promoters enhance the desulfurisation function and, except for uncalcined Ru, diminish the hydrogenation function of the catalysts. The Co-Nb catalysts were inactive. The promotion of V catalysts by Ni shows that an MoS2-type layer is not essential for synergy. Preliminary data on the Arrhenius parameters suggest compensation between the apparent activation energy, E, and the frequency factor, A, as the promoter mole fraction is changed. The results are consistent with a catalyst structure in which all or some promoters are dispersed by binding to unsaturated S atoms at the edge of MoS2 patches. |
