Characterization of vanadium oxide catalysts supported on tin dioxide by vanadium-51 and proton solid-state NMR spectroscopy

Characterization of V2O5/TiO2−ZrO2 Catalysts by XPS and Other Techniques

“…7,8 Several groups have investigated the structure of the immobilized vanadia by using various spectroscopic and nonspectroscopic techniques. 7,8,[19][20][21][22][23][24][25][26][27][28][29] Most of the papers concerning SCR reaction have dealt with zeolite or single metal oxide-based catalysts. However, binary metal oxides are expected to exhibit better catalytic activity for this reaction due to their solid acid or base properties.…”

“…Research by many groups has shown that high activity and selectivity are achieved when the vanadia is present on the support surface in the form of highly dispersed, amorphous species, rather than as crystallites of V 2 O 5 . , Several groups have investigated the structure of the immobilized vanadia by using various spectroscopic and nonspectroscopic techniques. ,,− Most of the papers concerning SCR reaction have dealt with zeolite or single metal oxide-based catalysts. However, binary metal oxides are expected to exhibit better catalytic activity for this reaction due to their solid acid or base properties .…”

Dynamic States of V2O5 Supported on SnO2/SiO2 and CeO2/SiO2 Mixed-Oxide Catalysts during Methanol Oxidation

“…10,11 The molecular structures of the V 2 O 5 supported on SnO 2 and CeO 2 catalysts were recently investigated by solid-state 51 V and 1 H NMR, electron spin resonance, and in situ Raman techniques. [11][12][13][14][15][16] The solid-state 51 V and 1 H NMR results indicated the formation of a surface vanadia overlayer on SnO 2 with a monolayer coverage of 3.2 wt % V 2 O 5 . [11][12][13] The ESR results indicated that the reduced V 2 O 5 /SnO 2 catalysts form an isolated V 4+ (or VO 2+ ) species in a distorted oxygen environment.…”

“…[11][12][13][14][15][16] The solid-state 51 V and 1 H NMR results indicated the formation of a surface vanadia overlayer on SnO 2 with a monolayer coverage of 3.2 wt % V 2 O 5 . [11][12][13] The ESR results indicated that the reduced V 2 O 5 /SnO 2 catalysts form an isolated V 4+ (or VO 2+ ) species in a distorted oxygen environment. 11,14,15 In situ Raman studies revealed that the dehydrated surface vanadia species on the SnO 2 support possess Raman bands at ∼1027, ∼900, and ∼830 cm -1 16 and that the dehydrated surface vanadium oxide species on the CeO 2 support possess Raman bands at ∼1027 and ∼920 cm -1 .…”

“…The V 2 O 5 supported on SnO 2 and CeO 2 catalysts are often used for the application of hydrocarbon oxidation reactions. , The molecular structures of the V 2 O 5 supported on SnO 2 and CeO 2 catalysts were recently investigated by solid-state 51 V and 1 H NMR, electron spin resonance, and in situ Raman techniques. − The solid-state 51 V and 1 H NMR results indicated the formation of a surface vanadia overlayer on SnO 2 with a monolayer coverage of 3.2 wt % V 2 O 5 . − The ESR results indicated that the reduced V 2 O 5 /SnO 2 catalysts form an isolated V 4+ (or VO 2+ ) species in a distorted oxygen environment. ,, In situ Raman studies revealed that the dehydrated surface vanadia species on the SnO 2 support possess Raman bands at ∼1027, ∼900, and ∼830 cm -1 16 and that the dehydrated surface vanadium oxide species on the CeO 2 support possess Raman bands at ∼1027 and ∼920 cm -1 . Consequently, the dehydrated surface vanadia species with a terminal VO (Raman band at ∼1027 cm -1 ) and surface polymeric vanadate functionalities (Raman band in the 900−920 cm -1 region) exist on both the SnO 2 and CeO 2 surfaces.…”