Electronic spectroscopy of the state of cu2+ ions in CuO−TiO2 catalysts

Influence of molar ratio and calcination temperature on the properties of Ti Sn1−O2 supporting copper oxide for CO oxidation

“…Although supported copper oxides [13][14][15][16][17][18][19][20][21][22][23] are highly active for CO oxidation, the reaction usually takes place at elevated temperatures (>200 • C). The systems of interests include CuO/CeO 2 [13][14][15][18][19][20], CuO/TiO 2 [21][22][23], CuO/SnO 2 [15,16], CuO/Al 2 O 3 [24,25], etc. Among these, CuO/TiO 2 catalysts have been studied intensively because they show promising activity for CO oxidation [21][22][23].…”

“…The systems of interests include CuO/CeO 2 [13][14][15][18][19][20], CuO/TiO 2 [21][22][23], CuO/SnO 2 [15,16], CuO/Al 2 O 3 [24,25], etc. Among these, CuO/TiO 2 catalysts have been studied intensively because they show promising activity for CO oxidation [21][22][23]. However, pure TiO 2 is reported to have poor thermal stability [26].…”

“…Although supported oxidic [13][14][15][16][17][18][19][20][21][22][23][24][25] and metallic [31,32] copper catalysts have been studied frequently and extensively, the specific nature of the active sites is still uncertain. In these studies, highly dispersed surface Cu + species are reported to be the most active compared with Cu 2+ and Cu 0 [11,13,25,33,34].…”

Surface structure characteristics of CuO/Ti0.5Sn0.5O2 and its activity for CO oxidation

“…Li et al [17] suggested that the interaction between TiO 2 and SnO 2 might improve the CuO dispersion on TiO 2 -SnO 2 support, which could contribute to the higher activity. However, two questions should be addressed: (1) what are the dispersion states of copper species on TiO 2 -SnO 2 support? (2) what is the relationship between the surface state and activity for CO oxidation, which has been a motivation for the current work.…”

“…In the past decades, a number of studies have been carried out for understanding CuO/TiO 2 catalysts due to their promising activity for CO oxidation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It is generally accepted that the activity of this catalytic system depends on the surface copper species concentration, dispersion state, reducibility and so on.…”