A search for reason for deactivation of alkylation iron catalyst

Autor:	Roman Klimkiewicz, P.J Godowski, Włodzimierz Tylus, Hanna Grabowska
Rok vydání:	2003
Předmět:	Process Chemistry and Technology Catalyst support Inorganic chemistry Iron oxide Alkylation Photochemistry Heterogeneous catalysis Catalyst poisoning Catalysis chemistry.chemical_compound chemistry Oxidation state Methanol
Zdroj:	Applied Catalysis A: General. 240:111-117
ISSN:	0926-860X
Popis:	Deactivation of the iron catalyst Fe-Si-Cr-K-O was investigated with the help of X-ray photoelectron spectroscopy and checked in reaction of phenol alkylation with methanol performed in gas phase at the atmospheric pressure. It was indicated that the catalytic action of the alkylation catalyst (active–inactive) could be correlated with the relative contribution of the oxidation states of iron (+2) and (+3). The intensity ratio of the Fe 3p individual components was found to be a good measure of the contribution. The catalyst as-prepared has the (+2)/(+3) ratio 1.7, active in reaction—1.9, calcined at 1000 °C—1.4 and deactivated during the reaction—2.7. The process accompanied other reasons for deactivation as carbon deposition on the surface and/or sintering of catalyst crystallites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f7b45bf8feb73c5aece071e4d9d22738 https://doi.org/10.1016/s0926-860x(02)00411-8 Zobrazit plný text záznamu Full Text from ScienceDirect