Simultaneous promotion of hydrogenation and direct desulfurization routes in hydrodesulfurization of 4,6-dimethyldibenzothiophene over NiW catalyst by use of SiO2-Al2O3 support in combination with trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid

摘要: Abstract Effect of novel SiO2-Al2O3 support on surface structure and hydrodesulfurization (HDS) activity the NiW catalyst prepared using trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid (CyDTA) was investigated by combination quasi in situ TEM, diffuse reflectance FTIR spectroscopy (DRIFTS) coupled with NO adsorption, 4,6-dimethyldibenzothiophene (4,6-DMDBT) HDS measurement. When catalysts were without CyDTA, TEM observation showed that WS2-like slabs supported W had higher stacking degree, but smaller basal plane sizes compared Al2O3 counterparts. In DRIFTS adsorption further revealed formation Ni–W–S phase suppressed use support. The for hydrogenation (HYD) 4,6-DMDBT into tetrahydro-DMDBT (THDMDBT) than counterpart. However, this failed to promote HYD route because lower C–S bond cleavage THDMDBT, catalyst. On other hand, promoted when which accompanied increase degree decrease size slabs. Double-layered predominant CyDTA. This both 4,6-DMDBT, THDMDBT. direct desulfurization (DDS) simultaneously over catalyst, leading three times These results suggest multi-layered is crucial promoting 4,6-DMDBT.