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Recent Advances in Using Niobium Compounds as Catalysts in Organic Chemistry
(Bentham Science Publ Ltd, 2015-01-01)
Niobium is not found in nature in its free form, but usually in the form of oxides and usually with the tantalum element. The largest niobium reserves are in Brazil. The use of niobium compounds in organic synthesis has ...
Phase transition in niobium pentoxide supported on silica-alumina
(2008)
Nb2O5 supported on SiO2–Al2O3 were prepared with a wide loading range (2, 5, 10, 15, 20 and 25 mass%) and analyzed by simultaneous
thermogravimetric (TG) and differential thermal analysis (DTA). The materials presented a ...
Esterification of acetic acid with alcohols using supported niobium pentoxide on silica–alumina catalysts
(2008)
Supported niobium pentoxide catalysts are active for a variety of acid and redox catalyzed reactions such as dehydration, hydrogenation and esterification. In this work, niobium pentoxide has been supported on silica–alumina ...
Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina
(2007)
Copper oxide and niobium pentoxide were
supported on silica–alumina with 2, 5, 10, 15 and 25 mass% loadings and 1:1 mass ratio of CuO:Nb2O5. XRD and BET measurements confirmed that monolayer coverage is reached with loadings ...