Mohsen Mehdipour Ghazi - Department of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, Iran
Ali Saber
Ali Bahrami

The effect of the carbon nanotube (CNT) and alumina as supports for Co-Mo catalyst in HDS process has been studied. TPR results reveal that the active species on Co-Mo/CNT are more easily reduced than those in Co-MC/γ-Al2O3, indicating that the CNT supports favors the reduction of active species. Catalyst activity test showed that the sulfur content in products for the CNT supported Co-Mo catalyst is lower than that for the alumina supported Co-Mo catalyst if the reaction was carried out above 583 K. The HDS experiments clearly show that Co Mo/CNT catalysts are more active than Co–MC/γ-Al2O3, and that the hydrogenolysis/hydrogenation selectivity of Co–Mo/CNT catalyst is much higher than Co–MC/γ-Al2O3. It is suggested that a possible relation might exist between the TPR property and HDS activity of catalysts. Of all the carbon nanotube supported catalysts, the maximum promoter effect of Co atom on molybdenum atom is Co/Mo atomic ratio of 0.7 and the 0.7 Co–Mo/CNT catalysts show the highest activity, whereas the catalysts with Co/Mo ratio of 0.35 have the highest selectivity

CNT;Co-Mo; HDS;TPR