On the synergy between tungsten and molybdenum in the W-incorporated CoMo/gamma-Al2O3 hydrodesulfurization catalysts

The aim of this study is to investigate the influence of incorporation of t ungsten on an already prepared CoMo/gamma -Al2O3 hydrodesylfurization catal yst (base catalyst). The evaluation of W-incorporated CoMo/gamma -Al2O3 is described, in relation to them base catalyst, concerning their activities f or hydrodesulfurization (HDS) of thiophene and hydrogenation (HYG) of its u nsaturated products towards butane. The main conclusion of this study is th at incorporation of a low amount of tungsten onto CoMo/gamma -Al2O3 catalys t increases its HDS and HYG activities. A synergy has not been found betwee n Mo- and W-phase. The W-loading for which the maximum activity is observed highly depends on the details of the preparation method used. (C) 2001 Els evier Science B.V. All rights reserved.