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Catalytic hydrodechlorination of tetrachloroethylene over Pd/TiO2 minimonoliths / Gonzalez, Carlos A. in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 490–497 Titre : Catalytic hydrodechlorination of tetrachloroethylene over Pd/TiO2 minimonoliths Type de document : texte imprimé Auteurs : Gonzalez, Carlos A., Auteur ; Montes de Correa, Consuelo, Auteur Année de publication : 2010 Article en page(s) : pp 490–497 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  Hydrodechlorination  Tétrachloroéthylène. Résumé : The gas phase catalytic hydrodechlorination (CHD) of tetrachloroethylene (TTCE) over 0.8% Pd/TiO2 (Hombikat uv-100) washcoated cordierite minimonoliths has been studied in the temperature range 120−180 °C. Experiments were carried out operating under differential regimes at a gas hourly space velocity (GHSV) of 0.45 (g min)/mL and using different concentrations of TTCE (300−1000 ppmv), hydrogen (0−10000 ppmv), ethane (0−850 ppmv), and hydrogen chloride (0−550 ppmv). The turnover frequency, specific rate constant, reaction order, and activation energy were determined. The pseudo-first-order Langmuir−Hinshelwood models adequately represent experimental results. The best adjustment corresponds to models featuring TTCE adsorption (associative or dissociative) as the limiting step. The CHD reaction is favored as TTCE and hydrogen concentrations are increased, while HCl negatively affects kinetic parameters. In order to study the causes of deactivation, fresh and used catalyst samples were characterized by nitrogen adsorption (BET), H2 chemisorption, thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), and temperature-programmed oxidation coupled to mass spectrometry. Characterization results indicate that carbonaceous deposits were insignificant under reaction conditions, while the presence of HCl was the main cause of catalyst deactivation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901027y [article] Catalytic hydrodechlorination of tetrachloroethylene over Pd/TiO2 minimonoliths [texte imprimé] / Gonzalez, Carlos A., Auteur ; Montes de Correa, Consuelo, Auteur . - 2010 . - pp 490–497. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 490–497 Mots-clés : Catalyst  Hydrodechlorination  Tétrachloroéthylène. Résumé : The gas phase catalytic hydrodechlorination (CHD) of tetrachloroethylene (TTCE) over 0.8% Pd/TiO2 (Hombikat uv-100) washcoated cordierite minimonoliths has been studied in the temperature range 120−180 °C. Experiments were carried out operating under differential regimes at a gas hourly space velocity (GHSV) of 0.45 (g min)/mL and using different concentrations of TTCE (300−1000 ppmv), hydrogen (0−10000 ppmv), ethane (0−850 ppmv), and hydrogen chloride (0−550 ppmv). The turnover frequency, specific rate constant, reaction order, and activation energy were determined. The pseudo-first-order Langmuir−Hinshelwood models adequately represent experimental results. The best adjustment corresponds to models featuring TTCE adsorption (associative or dissociative) as the limiting step. The CHD reaction is favored as TTCE and hydrogen concentrations are increased, while HCl negatively affects kinetic parameters. In order to study the causes of deactivation, fresh and used catalyst samples were characterized by nitrogen adsorption (BET), H2 chemisorption, thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), and temperature-programmed oxidation coupled to mass spectrometry. Characterization results indicate that carbonaceous deposits were insignificant under reaction conditions, while the presence of HCl was the main cause of catalyst deactivation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901027y

Kinetic modeling of limonene epoxidation over pw-amberlite / Barrera Zapata, Rolando in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 647–653 Titre : Kinetic modeling of limonene epoxidation over pw-amberlite Type de document : texte imprimé Auteurs : Barrera Zapata, Rolando, Auteur ; Aida Luz Villa, Auteur ; Montes de Correa, Consuelo, Auteur Année de publication : 2009 Article en page(s) : p 647–653 Langues : Anglais (eng) Mots-clés : kinetics--limonene Résumé : The kinetics of limonene epoxidation catalyzed by PW-Amberlite under triphasic conditions is described. A mechanistic pathway was postulated, and a heterogeneous kinetic model was derived following pseudo-stationary-state theory. Using adsorption parameters that were estimated from independent binary adsorption experiments, the resulting kinetic model fitted the experimental data quite well. Note de contenu : chemical engenireeng En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800822n [article] Kinetic modeling of limonene epoxidation over pw-amberlite [texte imprimé] / Barrera Zapata, Rolando, Auteur ; Aida Luz Villa, Auteur ; Montes de Correa, Consuelo, Auteur . - 2009 . - p 647–653. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 647–653 Mots-clés : kinetics--limonene Résumé : The kinetics of limonene epoxidation catalyzed by PW-Amberlite under triphasic conditions is described. A mechanistic pathway was postulated, and a heterogeneous kinetic model was derived following pseudo-stationary-state theory. Using adsorption parameters that were estimated from independent binary adsorption experiments, the resulting kinetic model fitted the experimental data quite well. Note de contenu : chemical engenireeng En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800822n