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Catalytic studies toward synthesis of 2,6 - dimethylnaphthalene from 1 - (p - Tolyl) - 2 - methylbutane / Kari Vahteristo in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4018–4025 Titre : Catalytic studies toward synthesis of 2,6 - dimethylnaphthalene from 1 - (p - Tolyl) - 2 - methylbutane Type de document : texte imprimé Auteurs : Kari Vahteristo, Auteur ; Kari-Matti Sahala, Auteur ; Salme Koskimies, Auteur Année de publication : 2010 Article en page(s) : pp. 4018–4025 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts Résumé : In this work experiments have been performed in order to study the synthesis of 2,6-dimethylnaphthalene (DMN) via dehydrocyclizing 1-(p-tolyl)-2-methylbutane over Pt/SiO2, V/Ca/Al2O3, and unimpregnated or potassium-impregnated Cr2O3/Al2O3 catalysts. The obtained liquid product mixture consisted of 1,6-cyclization products (dimethylnaphthalenes) and dealkylated 1,6-cyclization products (2-methylnaphthalene and naphthalene), 1,5-cyclization products (trimethylindanes and -indenes), and fragmentation products (mainly p-xylene and 3-(p-tolyl)-propylenes) and 1-(p-tolyl)-2-methylbutenes. Among 10 possible DMN isomers 1,5-, 1,6-, 2,6-, and 2,7-DMN were identified. Metal catalysts V/Ca/Al2O3 (5 wt % vanadium) and Pt/SiO2 (1 wt % platinum) were slightly more active than unimpregnated commercial Cr2O3/Al2O3. After 1 h on-stream time the conversion of 1-(p-tolyl)-2-methylbutane was 96 mol % when the artificial contact time (1/weight-hourly space velocity (WHSV)) was 5.7 h at 783 K over unimpregnated Cr2O3/Al2O3. Potassium impregnation decreased the conversion into 84 mol % because of the decreased Brunauer−Emmett−Teller surface area (from 97 m2/g unimpregnated to 70 m2/g potassium-impregnated catalyst). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9008887 [article] Catalytic studies toward synthesis of 2,6 - dimethylnaphthalene from 1 - (p - Tolyl) - 2 - methylbutane [texte imprimé] / Kari Vahteristo, Auteur ; Kari-Matti Sahala, Auteur ; Salme Koskimies, Auteur . - 2010 . - pp. 4018–4025. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4018–4025 Mots-clés : Catalysts Résumé : In this work experiments have been performed in order to study the synthesis of 2,6-dimethylnaphthalene (DMN) via dehydrocyclizing 1-(p-tolyl)-2-methylbutane over Pt/SiO2, V/Ca/Al2O3, and unimpregnated or potassium-impregnated Cr2O3/Al2O3 catalysts. The obtained liquid product mixture consisted of 1,6-cyclization products (dimethylnaphthalenes) and dealkylated 1,6-cyclization products (2-methylnaphthalene and naphthalene), 1,5-cyclization products (trimethylindanes and -indenes), and fragmentation products (mainly p-xylene and 3-(p-tolyl)-propylenes) and 1-(p-tolyl)-2-methylbutenes. Among 10 possible DMN isomers 1,5-, 1,6-, 2,6-, and 2,7-DMN were identified. Metal catalysts V/Ca/Al2O3 (5 wt % vanadium) and Pt/SiO2 (1 wt % platinum) were slightly more active than unimpregnated commercial Cr2O3/Al2O3. After 1 h on-stream time the conversion of 1-(p-tolyl)-2-methylbutane was 96 mol % when the artificial contact time (1/weight-hourly space velocity (WHSV)) was 5.7 h at 783 K over unimpregnated Cr2O3/Al2O3. Potassium impregnation decreased the conversion into 84 mol % because of the decreased Brunauer−Emmett−Teller surface area (from 97 m2/g unimpregnated to 70 m2/g potassium-impregnated catalyst). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9008887