Rhodium supported Hβ zeolite for the hydrogenation of toluene / Kalpesh B. Sidhpuria in Industrial & engineering chemistry research, Vol. 47 n°12 (Juin 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4034–4042 Titre : Rhodium supported Hβ zeolite for the hydrogenation of toluene Type de document : texte imprimé Auteurs : Kalpesh B. Sidhpuria, Auteur ; Parimal A. Parikh, Auteur ; Pratap Bahadur, Auteur ; Raksh V. Jasra, Auteur Année de publication : 2008 Article en page(s) : p. 4034–4042 Note générale : Bibliogr. p. 4041-4042 Langues : Anglais (eng) Mots-clés : Noble metal Rh  Toluene -- hydrodearomatization  Fourier transform infrared spectra  Chemical analysis Résumé : Noble metal Rh supported on a large pore high acidic zeolite Hβ has been explored as a hydrodearomatization catalyst. The detail kinetic study of hydrodearomatization of toluene over a 1 wt % Rh/Hβ was done in a continuous-downflow stainless steel catalytic fixed bed reactor at varied space time, toluene feed rate, hydrogen partial pressure, hydrogen to toluene mole ratio, temperature, and in the presence of dibenzothiophene. The time on stream data and reaction order with respect to toluene were measured and was found to be of first order. Fourier transform infrared (FTIR) spectra and chemical analysis of fresh and spent catalyst suggested the presence of surface carbon species and weight percent carbon was found to be 4.43%. It was observed that toluene conversion was increased on increasing H2 partial pressure and H2/feed mole ratio. The conversion is dependent on temperature and shows a well-defined maximum. The decrease of the catalyst activity in the presence of dibenzothiophene is mainly attributed to the adsorption and decomposition of dibenzothiophene (DBT) on the metal sites, which results in a loss of metal surface available for the reaction to take place and a higher coke formation reducing the fraction of acid sites available for toluene hydrodearomatization. A nonlinear semiempirical kinetic model was also developed to have the best fit with 12% error. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8001793 [article] Rhodium supported Hβ zeolite for the hydrogenation of toluene [texte imprimé] / Kalpesh B. Sidhpuria, Auteur ; Parimal A. Parikh, Auteur ; Pratap Bahadur, Auteur ; Raksh V. Jasra, Auteur . - 2008 . - p. 4034–4042. Bibliogr. p. 4041-4042 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4034–4042 Mots-clés : Noble metal Rh  Toluene -- hydrodearomatization  Fourier transform infrared spectra  Chemical analysis Résumé : Noble metal Rh supported on a large pore high acidic zeolite Hβ has been explored as a hydrodearomatization catalyst. The detail kinetic study of hydrodearomatization of toluene over a 1 wt % Rh/Hβ was done in a continuous-downflow stainless steel catalytic fixed bed reactor at varied space time, toluene feed rate, hydrogen partial pressure, hydrogen to toluene mole ratio, temperature, and in the presence of dibenzothiophene. The time on stream data and reaction order with respect to toluene were measured and was found to be of first order. Fourier transform infrared (FTIR) spectra and chemical analysis of fresh and spent catalyst suggested the presence of surface carbon species and weight percent carbon was found to be 4.43%. It was observed that toluene conversion was increased on increasing H2 partial pressure and H2/feed mole ratio. The conversion is dependent on temperature and shows a well-defined maximum. The decrease of the catalyst activity in the presence of dibenzothiophene is mainly attributed to the adsorption and decomposition of dibenzothiophene (DBT) on the metal sites, which results in a loss of metal surface available for the reaction to take place and a higher coke formation reducing the fraction of acid sites available for toluene hydrodearomatization. A nonlinear semiempirical kinetic model was also developed to have the best fit with 12% error. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8001793

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