Catalysis Letters, Vol.150, No.9, 2674-2687, 2020
Aqueous-Phase Reforming of Glycerol over Carbon-Nanotube-Supported Catalysts
Bimetallic Pt-Ni and Cu-Ni composites on multiwalled carbon nanotubes (MWNT) were tested as catalysts for the aqueous-phase reforming of glycerol in a continuous-flow fixed-bed reactor. The catalyst 1Pt-3Ni/MWNT, containing 1 wt% Pt and 3 wt% Ni, performed best, producing 21.2 mmol H-2 g(cat)(-1) h(-1); however, the noble-metal-free catalyst 1Cu-12Ni/MWNT also performed well, producing 9.94 mmol H-2 g(cat)(-1) h(-1). Neither of these catalysts produced detectable amounts of CO. Though Cu-Ni catalysts for aqueous-phase reforming have been reported, they have not been tested for uses of > 12 h. We found that 1Cu-12Ni/MWNT maintained its activity throughout a 100-h test and could be reused, though some activity was lost after two uses. Separate tests of the catalysts in the water-gas shift reaction suggested that the selectivity for H-2 over CH4 in this reaction was decisive for the corresponding selectivity in aqueous phase reforming over Cu-Ni/MWNT, but not Pt-Ni/MWNT, catalysts. Graphic [GRAPHICS] .