Hydrodeoxygenation of guaiacol over ReS2/activated carbon catalysts. Support and Re loading effect
•Two commercial activated carbons with different properties were used as supports.•Oxygen surface groups resistant to sulfidation diminished guaiacol conversion.•The conversion of guaiacol was affected by the Re contents.•The phenol/catechol ratio were not influenced by the Re contents.
Two activated carbons (GAC and CGran Norit) were used as supports to prepare Re/C catalysts (0.4 atoms of Re per nm2 of support). In addition, Re(x)/GAC catalysts with loadings of 0.5, 0.6, 0.7 and 0.8 atoms of Re per nm2 of support were prepared. The activity difference between Re(0.4)/CGran and Re(0.4)/GAC catalysts was related to the amount of surface oxygen functional groups on the support that is resistant to sulfidation. Meanwhile, the activity of the Re(x)/GAC catalysts as a function of Re content was correlated with ReS2 dispersion; the most active catalyst was the one with Re loading of 0.6 atoms per nm2 of support. On the other hand, the selectivity, expressed in terms of the phenol/catechol ratio, did not change with Re loading but was rather mainly influenced by the acid strength of the support.
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Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 427–437