Preparation, characterization, and activity evaluation of H - ZSM - 5 catalysts in vapor - phase methanol dehydration to dimethyl ether / Samaneh Hassanpour in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4063-4069 Titre : Preparation, characterization, and activity evaluation of H - ZSM - 5 catalysts in vapor - phase methanol dehydration to dimethyl ether Type de document : texte imprimé Auteurs : Samaneh Hassanpour, Auteur ; Majid Taghizadeh, Auteur Année de publication : 2010 Article en page(s) : pp. 4063-4069 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dehydration Catalyst Preparation Résumé : Using the hydrothermal crystallization method, a highly crystalline series of H-ZSM-5 zeolites were prepared in different Si/Al molar ratios (ranging from 25 up to 250). The performance of prepared catalysts was a subject of assessment in the process of methanol dehydration to dimethyl ether (DME), where a stainless steel fixed-bed flow reactor at 573 K and 16 barg with WHSV of 26.5 h 1 was used. The catalysts were characterized by BET, XRD, NH3-TPD, ICP, TGA/DTA, TPH, and SEM techniques. According to the experimental results, the catalytic activity and surface acidity were increased with an increase in the Si/Al molar ratio up to 125 and then decreased. The sample with a Si/Al molar ratio of 125 [H-ZSM-5(125)] exhibited the best conversion and highest activity in methanol dehydration to DME. Before a comprehensive study was made on the synthesized zeolite catalysts, the dehydration reaction with crude methanol was studied over a commercial H-ZSM-5 catalyst under identical conditions. Results show that prepared catalysts have a better performance than commercial ones. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732895 [article] Preparation, characterization, and activity evaluation of H - ZSM - 5 catalysts in vapor - phase methanol dehydration to dimethyl ether [texte imprimé] / Samaneh Hassanpour, Auteur ; Majid Taghizadeh, Auteur . - 2010 . - pp. 4063-4069. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4063-4069 Mots-clés : Dehydration Catalyst Preparation Résumé : Using the hydrothermal crystallization method, a highly crystalline series of H-ZSM-5 zeolites were prepared in different Si/Al molar ratios (ranging from 25 up to 250). The performance of prepared catalysts was a subject of assessment in the process of methanol dehydration to dimethyl ether (DME), where a stainless steel fixed-bed flow reactor at 573 K and 16 barg with WHSV of 26.5 h 1 was used. The catalysts were characterized by BET, XRD, NH3-TPD, ICP, TGA/DTA, TPH, and SEM techniques. According to the experimental results, the catalytic activity and surface acidity were increased with an increase in the Si/Al molar ratio up to 125 and then decreased. The sample with a Si/Al molar ratio of 125 [H-ZSM-5(125)] exhibited the best conversion and highest activity in methanol dehydration to DME. Before a comprehensive study was made on the synthesized zeolite catalysts, the dehydration reaction with crude methanol was studied over a commercial H-ZSM-5 catalyst under identical conditions. Results show that prepared catalysts have a better performance than commercial ones. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732895

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