Rao, Komateedi N. Venkataswamy, Perala Bharali, Pankaj Ha, Heon Phil Reddy, Benjaram M. 2024-01-20T15:05:57Z 2024-01-20T15:05:57Z 2021-09-05 2012-03 0922-6168 https://pubs.kist.re.kr/handle/201004/129488 A series of TiO2-ZrO2 supported V2O5 catalysts with vanadia loadings ranging from 4 to 12 wt% were synthesized by a wet impregnation technique and subjected to various thermal treatments at temperatures ranging from 773 to 1,073 K to understand the dispersion and thermal stability of the catalysts. The prepared catalysts were characterized by X-ray powder diffraction (XRD), BET surface area, oxygen uptake, and X-ray photoelectron spectroscopy (XPS) techniques. XRD results of 773 K calcined samples conferred an amorphous nature of the mixed oxide support and a highly dispersed form of vanadium oxide. Oxygen uptake measurements supported the formation of a monolayer of vanadium oxide over the thermally stable TiO2-ZrO2 support. The O 1s, Ti 2p, Zr 3d, and V 2p core level photoelectron peaks of TiO2-ZrO2 and V2O5/TiO2-ZrO2 catalysts are sensitive to the calcination temperature. No significant changes in the oxidation states of Ti4+ and Zr4+ were noted with increasing thermal treatments. Vanadium oxide stabilized as V4+ at lower temperatures, and the presence of V5+ is observed at 1,073 K. The synthesized catalysts were evaluated for selective oxidation of o-xylene under normal atmospheric pressure in the temperature range of 600-708 K. The TiO2-ZrO2 support exhibits very less conversion of o-xylene, while 12 wt% V2O5 loaded sample exhibited a good conversion and a high product selectivity towards the desired product, phthalic anhydride. English SPRINGER VANADIUM-OXIDE CATALYSTS PHTHALIC-ANHYDRIDE STRUCTURAL-CHARACTERIZATION TIO2-ZRO2 CATALYSTS TITANIA CATALYSTS UTILIZING CO2 SOFT OXIDANT DEHYDROGENATION OXIDEHYDROGENATION ETHYLBENZENE Monolayer V2O5/TiO2-ZrO2 catalysts for selective oxidation of o-xylene: preparation and characterization Article 10.1007/s11164-011-0412-x 1 RESEARCH ON CHEMICAL INTERMEDIATES, v.38, no.3-5, pp.733 - 744 RESEARCH ON CHEMICAL INTERMEDIATES 38 3-5 733 744 scie scopus 000302146500005 2-s2.0-84862699601 Chemistry, Multidisciplinary Chemistry Review VANADIUM-OXIDE CATALYSTS PHTHALIC-ANHYDRIDE STRUCTURAL-CHARACTERIZATION TIO2-ZRO2 CATALYSTS TITANIA CATALYSTS UTILIZING CO2 SOFT OXIDANT DEHYDROGENATION OXIDEHYDROGENATION ETHYLBENZENE TiO2-ZrO2 V2O5 dispersion Redox properties o-Xylene Phthalic anhydride