Production of butadiene by oxidative butane dehydrogenation with NO: effect of the oxidant species and lattice oxygen mobility in V2O5–WO3/TiO2 catalyst. Issue 9 (31st March 2022)

• Record Type: Journal Article
• Authors: Dasireddy, Venkata D. B. C.; Logar, Nataša Zabukovec; Kovač, Janez; Likozar, Blaž
• Is Part Of: Catalysis science & technology. Volume 12:Issue 9(2022)
• Page Start: 2990
• Page End: 3003
• Publication Date: 2022-03-31
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d1cy02133h
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : The lattice oxygen mobility and storage in V2 O5 –WO3 /TiO2 affect the catalytic performance. A significant production extent of butadiene with no oxygenated compound products was formed using NO, while O2 favoured cracking hydrocarbon chains and CO x . Abstract : V2 O5 –WO3, supported on a TiO2 catalyst, was tested for n -butane oxidative dehydrogenation with NO/O2 . The effect of the physical oxygen mobility and nature in the V2 O5 –WO3 /TiO2 catalyst on the applicative catalytic performance was investigated. The influence of the O2 /NO species on the chemical reaction products/Mars–van Krevelen (MvK) cycle was examined by performing online time studies with the removal of an oxidant (O2 /NO) in the feed. A high rate of selectivity towards butadiene was obtained when NO was used. No trace concentration of NO was observed at commonly higher temperatures. N2 O or NO2 was not present in the effluent gas compounds, and the mechanism was analyzed. In the presence of both O2 /NO, a high synthesis yield of diene was determined at lower reactant conversions. The former increased up to 40% n -butane conversion, and decreased with a further increase in n -butane conversion. X-ray photoelectron spectroscopy (XPS) showed that the re-oxidation with NO restored the lattice oxygen (O 2− ) in the catalyst, along with the surface oxygen species. The catalyst reduced at 350 °C showed the presence of the superficial lattice oxygen species (O − /O 2− ) generated from the lattice defects, which also involved the interstitial oxygen species. The catalyst reduced at 450 °C showed the presence of the O 2− radical anion with the co-existence of O2 − . The product distribution showed that the butane dehydrogenation to butene and butadiene occurred, and that the insertion of oxygen into the catalyst lattice favored butadiene production.