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Synthesis and characterization of mesoporous and nano-crystalline phosphate zirconium oxides

“…Three absorption bands at 1340, 1220 and 992 cm −1 together with another little bands located in the range of 1450-900 cm −1 were observed for pure zirconia calcined at 400 and 500 • C, and also related with traces of the organic compounds on zirconia. For these calcination temperatures, the spectra have two small bands at 2890 and 2870 cm −1 , produced by the symmetric and asymmetric flexion vibration of the C-H bonds associated to the CH 2 groups connected to aliphatic groups [19]. All the spectra show bands located at 754, 580 and 500 cm −1 which are assigned to Zr-O bonds [20].…”

Propane Dehydrogenation Over PtSn Catalysts Supported on ZnO-Modified MgAl2O4

“…This will reduce catalyst active site and cause the loss of some activity. Some researches have been done on deposition carbon of the catalyst surface about supported Pt catalysts [36,37]. From TEM (Fig.…”

Micro-Raman study of indium doped zirconia obtained by sol–gel

“…Recently alumina is being substituted by zirconia due its electronic properties that can stabilize metallic rhodium in one step [2]. Indium is used as a promoter to modify the catalytic activity and structural and textural properties of zirconia [3]. In addition, the catalytic properties of rhodium, a selective catalyst for reduction of NO x [4] can be improved supporting it on indium-zirconia [5].…”