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Effect of magnesium addition to PtSnNa/ZSM-5 on the catalytic properties in the dehydrogenation of propane / Linyang Bai in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9885–9891 Titre : Effect of magnesium addition to PtSnNa/ZSM-5 on the catalytic properties in the dehydrogenation of propane Type de document : texte imprimé Auteurs : Linyang Bai, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 9885–9891 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Magnesium  addition  Propane  dehydrogenation Résumé : The effect of Mg addition to PtSnNa/ZSM-5 on the catalytic properties in propane dehydrogenation was investigated. The catalysts were characterized by using different techniques: XRD, BET, TEM, NH3-TPD, XPS, TPO, and TG-DTA. Results indicate that the presence of magnesium not only modifies the acid function and the structure of metallic phase but also diminishes carbon deposition on the catalyst. Among the catalysts studied, the PtSnNaMg(0.5%)/ZSM-5 exhibits the best performance in terms of propane conversion and stability. The high catalytic performance may be due to the strong interaction between Pt and Sn. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900534m [article] Effect of magnesium addition to PtSnNa/ZSM-5 on the catalytic properties in the dehydrogenation of propane [texte imprimé] / Linyang Bai, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur . - 2010 . - pp. 9885–9891. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9885–9891 Mots-clés : Magnesium  addition  Propane  dehydrogenation Résumé : The effect of Mg addition to PtSnNa/ZSM-5 on the catalytic properties in propane dehydrogenation was investigated. The catalysts were characterized by using different techniques: XRD, BET, TEM, NH3-TPD, XPS, TPO, and TG-DTA. Results indicate that the presence of magnesium not only modifies the acid function and the structure of metallic phase but also diminishes carbon deposition on the catalyst. Among the catalysts studied, the PtSnNaMg(0.5%)/ZSM-5 exhibits the best performance in terms of propane conversion and stability. The high catalytic performance may be due to the strong interaction between Pt and Sn. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900534m

Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation / Hui Liu in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5598–5603 Titre : Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation Type de document : texte imprimé Auteurs : Hui Liu, Auteur ; Zhou Yuming, Auteur ; Yiwei Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 5598–5603 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : PtSnNa/ZSM-5  catalyst  Propane  dehydrogenation  BET  surface  area  measurement Résumé : The effect of different preparation processes (impregnation and agglomeration) on the performance and properties of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Some methods such as BET surface area measurement, catalyst particle mechanical strength, temperature-programmed desoption of ammonia (TPDA), Solid-state 27Al MAS NMR spectroscopy and temperature-programmed reduction of hydrogen (H2-TPR) were used to characterize the catalysts. The channel of ZSM-5 was hardly blocked after adding the binder despite the sequence of agglomeration and impregnation. Meanwhile the Pt metal dispersion on the preimpregnating catalyst with 5 wt % binder was the highest and the acidity was the weakest. The experimental results of propane dehydrogenation reaction showed that the preimpregnating catalyst with 5 wt % binder indicated the optimum reactivity in three catalysts. Therefore, the preimpregnating method in the case of adding a small amount binder was the optimal preparation method of the catalyst, which could replace the conventional preagglomerating method. Finally, a model for the effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 catalyst was proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900311j [article] Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation [texte imprimé] / Hui Liu, Auteur ; Zhou Yuming, Auteur ; Yiwei Zhang, Auteur . - 2009 . - pp. 5598–5603. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5598–5603 Mots-clés : PtSnNa/ZSM-5  catalyst  Propane  dehydrogenation  BET  surface  area  measurement Résumé : The effect of different preparation processes (impregnation and agglomeration) on the performance and properties of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Some methods such as BET surface area measurement, catalyst particle mechanical strength, temperature-programmed desoption of ammonia (TPDA), Solid-state 27Al MAS NMR spectroscopy and temperature-programmed reduction of hydrogen (H2-TPR) were used to characterize the catalysts. The channel of ZSM-5 was hardly blocked after adding the binder despite the sequence of agglomeration and impregnation. Meanwhile the Pt metal dispersion on the preimpregnating catalyst with 5 wt % binder was the highest and the acidity was the weakest. The experimental results of propane dehydrogenation reaction showed that the preimpregnating catalyst with 5 wt % binder indicated the optimum reactivity in three catalysts. Therefore, the preimpregnating method in the case of adding a small amount binder was the optimal preparation method of the catalyst, which could replace the conventional preagglomerating method. Finally, a model for the effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 catalyst was proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900311j

Influence of Binder on the CatalyticperformaInfluence of binder on the catalytic nce of ptSnNa/ZSM-5 catalyst for propane dehydrogenation / Hui Liu in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8142–8147 Titre : Influence of Binder on the CatalyticperformaInfluence of binder on the catalytic nce of ptSnNa/ZSM-5 catalyst for propane dehydrogenation Type de document : texte imprimé Auteurs : Hui Liu, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur Année de publication : 2008 Article en page(s) : p. 8142–8147 Note générale : Chemical engineering Langues : Anglais (eng) Résumé : The influence of different binders (alumina, silica sol, and montmorillonite) on the structure and performance of PtSnNa/ZSM-5 catalysts for propane dehydrogenation to propene was studied. Temperature-programmed desoption of ammonia (NH3-TPD), hydrogen chemisorption, BET surface area measurement, solid-state 27Al MAS NMR spectroscopy, catalyst particle mechanical strength, and X-ray diffraction (XRD) were used to characterize the catalysts. After agglomeration with different binders, the mechanical strength of all catalyst particles increased obviously in comparison with the nonagglomerated sample and the Al species amounts of the catalysts were affected greatly by the binder. A slightly acidic change was observed for the catalysts with different binders, but the metal dispersion on the carrier of different samples was clearly different. The result of propane dehydrogenation indicated that the catalyst based on PtSnNa/ZSM-5 agglomerated with alumina showed the highest conversion and high selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800693t [article] Influence of Binder on the CatalyticperformaInfluence of binder on the catalytic nce of ptSnNa/ZSM-5 catalyst for propane dehydrogenation [texte imprimé] / Hui Liu, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur . - 2008 . - p. 8142–8147. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8142–8147 Résumé : The influence of different binders (alumina, silica sol, and montmorillonite) on the structure and performance of PtSnNa/ZSM-5 catalysts for propane dehydrogenation to propene was studied. Temperature-programmed desoption of ammonia (NH3-TPD), hydrogen chemisorption, BET surface area measurement, solid-state 27Al MAS NMR spectroscopy, catalyst particle mechanical strength, and X-ray diffraction (XRD) were used to characterize the catalysts. After agglomeration with different binders, the mechanical strength of all catalyst particles increased obviously in comparison with the nonagglomerated sample and the Al species amounts of the catalysts were affected greatly by the binder. A slightly acidic change was observed for the catalysts with different binders, but the metal dispersion on the carrier of different samples was clearly different. The result of propane dehydrogenation indicated that the catalyst based on PtSnNa/ZSM-5 agglomerated with alumina showed the highest conversion and high selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800693t

Influence of lanthanum addition on catalytic properties of PtSnK/Al2O3 catalyst for isobutane dehydrogenation / Lihui Wan in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4280–4285 Titre : Influence of lanthanum addition on catalytic properties of PtSnK/Al2O3 catalyst for isobutane dehydrogenation Type de document : texte imprimé Auteurs : Lihui Wan, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 4280–4285 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  properties Résumé : The effect of lanthanum addition on catalytic properties of PtSnK/Al2O3 catalyst for isobutane dehydrogenation was investigated. The catalysts were characterized by nitrogen adsorption, H2 chemisorption, XRF, XRD, XPS, TG, TPO, and NH3-TPD. Results showed that with the appropriate addition of lanthanum, the platinum dispersion increased, and carbon depositions decreased. The presence of La in the PtSnK/Al2O3 catalysts could not only strengthen the Sn−Al2O3 interaction, but also stabilize the oxidation states of Sn species, thus increasing the reaction activity and stability. Among the catalysts investigated, PtSnKLa(0.9 wt %)/Al2O3 had the best catalytic performance. After reaction for 8 h, the isobutane conversion of 49% was achieved with the corresponding isobutene selectivity of higher than 95%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1023518 [article] Influence of lanthanum addition on catalytic properties of PtSnK/Al2O3 catalyst for isobutane dehydrogenation [texte imprimé] / Lihui Wan, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur . - 2011 . - pp. 4280–4285. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4280–4285 Mots-clés : Catalytic  properties Résumé : The effect of lanthanum addition on catalytic properties of PtSnK/Al2O3 catalyst for isobutane dehydrogenation was investigated. The catalysts were characterized by nitrogen adsorption, H2 chemisorption, XRF, XRD, XPS, TG, TPO, and NH3-TPD. Results showed that with the appropriate addition of lanthanum, the platinum dispersion increased, and carbon depositions decreased. The presence of La in the PtSnK/Al2O3 catalysts could not only strengthen the Sn−Al2O3 interaction, but also stabilize the oxidation states of Sn species, thus increasing the reaction activity and stability. Among the catalysts investigated, PtSnKLa(0.9 wt %)/Al2O3 had the best catalytic performance. After reaction for 8 h, the isobutane conversion of 49% was achieved with the corresponding isobutene selectivity of higher than 95%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1023518

Influence of the competitive adsorbates on the catalytic properties of PtSnNaMg/ZSM-5 catalysts for propane dehydrogenation / Linyang Bai in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4345–4350 Titre : Influence of the competitive adsorbates on the catalytic properties of PtSnNaMg/ZSM-5 catalysts for propane dehydrogenation Type de document : texte imprimé Auteurs : Linyang Bai, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 4345–4350 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  properties Résumé : This paper is aimed at studying the influence of the competitive adsorbates (HCl, lactic acid, and citric acid) on the structural and catalytic properties of PtSnNaMg/ZSM-5 catalysts for propane dehydrogenation. N2 adsorption, X-ray diffraction, inductively coupled plasma, NH3 temperature-programmed desorption, H2 temperature-programmed reduction and transmission electron microscopy were applied for characterization of the prepared catalysts. The catalytic performance was tested in a microreactor. The obtained results indicate that the catalyst prepared in HCl medium exhibited the best catalytic activity and stability due to relatively better metal distribution on the support and/or the strong interactions between Pt and Sn as well as between them and the support. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1018639 [article] Influence of the competitive adsorbates on the catalytic properties of PtSnNaMg/ZSM-5 catalysts for propane dehydrogenation [texte imprimé] / Linyang Bai, Auteur ; Yuming Zhou, Auteur ; Yiwei Zhang, Auteur . - 2011 . - pp. 4345–4350. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4345–4350 Mots-clés : Catalytic  properties Résumé : This paper is aimed at studying the influence of the competitive adsorbates (HCl, lactic acid, and citric acid) on the structural and catalytic properties of PtSnNaMg/ZSM-5 catalysts for propane dehydrogenation. N2 adsorption, X-ray diffraction, inductively coupled plasma, NH3 temperature-programmed desorption, H2 temperature-programmed reduction and transmission electron microscopy were applied for characterization of the prepared catalysts. The catalytic performance was tested in a microreactor. The obtained results indicate that the catalyst prepared in HCl medium exhibited the best catalytic activity and stability due to relatively better metal distribution on the support and/or the strong interactions between Pt and Sn as well as between them and the support. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1018639

Sn-Modified ZSM-5 As support for platinum catalyst in propane dehydrogenation / Yiwei Zhang in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

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