Mo-V-Te-Nb oxide catalysts: Reactivity of different oxygen species in partial and deep oxidation

Autor:	Vladimir Goncharov, A. A. Fedorova, Dmitry D. Frolov, Tamara V. Andrushkevich, Ekaterina M. Sadovskaya, E. V. Ishchenko, Galina Ya. Popova
Rok vydání:	2014
Předmět:	Process Chemistry and Technology Inorganic chemistry Hexagonal phase Oxide chemistry.chemical_element Oxygen Catalysis chemistry.chemical_compound chemistry Phase (matter) Limiting oxygen concentration Orthorhombic crystal system Partial oxidation Physical and Theoretical Chemistry
Zdroj:	Journal of Molecular Catalysis A: Chemical. 392:61-66
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2014.04.023
Popis:	Isotopic oxygen exchange on the surface of Mo-V-Te-Nb oxide catalysts was studied. Catalyst samples contained more than 95% of (i) orthorhombic phase M1, (ii) pseudo hexagonal phase M2, or (iii) layered phase with structure Me 5 O 14 (Me – Mo, V, Nb). Two forms of exchangeable oxygen were found on the surface, i.e. strongly bonded lattice oxygen and relatively weakly bonded adsorbed oxygen. According to in situ studies with isotope 18 O adsorbed oxygen leads to deep oxidation products, while lattice oxygen participates mainly in the partial oxidation processes. Weakly bonded oxygen concentration decreases in series: Me 5 O 14 > M2 > M1 and thus selectivity towards partial oxidation increases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::078cba8c8f1b7a8f7b87c2b5cbfe525e https://doi.org/10.1016/j.molcata.2014.04.023 Zobrazit plný text záznamu Full Text from ScienceDirect