Effect of oxalic acid content and medium of thermal treatment on physicochemical and catalytic properties of MoVTeNb oxide catalysts in propane ammoxidation

Autor:	G. Ya. Popova, G.I. Aleshina, T. V. Andrushkevich, M.I. Khramov, L. M. Plyasova
Rok vydání:	2007
Předmět:	Process Chemistry and Technology Inorganic chemistry Oxalic acid Oxide Thermal treatment Heterogeneous catalysis Catalysis law.invention chemistry.chemical_compound chemistry law Propane Calcination Ammoxidation
Zdroj:	Applied Catalysis A: General. 328:195-200
ISSN:	0926-860X
DOI:	10.1016/j.apcata.2007.06.010
Popis:	Catalytic characteristics of MoV 0.3 Te 0.23 Nb 0.12 O x catalysts in propane ammoxidation depend strongly on the quantity of oxalic acid present during slurry preparation and on the redox conditions during thermal treatment of the catalyst. Two stage thermal treatment (320 °C in air, 600 °C in He) and oxalate anion to niobium ratio in the slurry С 2 О 4 2− /Nb = 3–5 have been shown to result in the catalysts with the best catalytic properties. Optimal catalysts have been found to contain M1 and M2 crystalline phases in the ratio of 3:1 or more. When the molar ratio С 2 О 4 2− /Nb exceeds 3.5, tellurium is lost during calcination in He and other phases beside M1 and M2 are formed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::17ff2743f194a222bf90355eb3cbf2e8 https://doi.org/10.1016/j.apcata.2007.06.010 Zobrazit plný text záznamu Full Text from ScienceDirect