The Effect of Extra-Framework Aluminum in Dealuminated ZSM-5 Zeolites on the Transformation of Aromatic Hydrocarbons

Autor:	Hans G. Jerschkewitz, Blanka Wichterlová, Günter Lischke, Alena Vondrová, Jiří Čejka, Ellen Schreier
Rok vydání:	1995
Předmět:	chemistry.chemical_compound Ethylene Chemistry Inorganic chemistry Steaming Disproportionation General Chemistry Coke Alkylation ZSM-5 Zeolite complex mixtures Toluene
Zdroj:	Collection of Czechoslovak Chemical Communications. 60:412-420
ISSN:	1212-6950 0010-0765
DOI:	10.1135/cccc19950412
Popis:	H-ZSM-5 zeolite was dealuminated by steaming under "mild" and "severe" conditions at 675 and 975 K for 71.5 and 0.5 h, respectively. It resulted in a comparable number of Al atoms released from the zeolite framework, although of their different nature. The "mild" zeolite steaming yielded Al species easily removable from the zeolite by an acid leaching, in contrast to the zeolite steamed at "severe" conditions. The extra-framework Al species contributed to both a substantially higher para-selectivity in toluene disproportionation and its alkylation with ethylene and to an increased rate of side reactions leading to the zeolite deactivation by coke formation in toluene alkylation with ethylene.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::edf3751f4eadf69d71ae16e94cba2b28 https://doi.org/10.1135/cccc19950412 Zobrazit plný text záznamu