Propane dehydrogenation over Pt-Sn catalysts

PtSn/Al 2 O 3 and PtSn/Al 2 O 3 -Na catalysts display important modifications of the metallic phase with respect to Pt/Al 2 O 3 one. In this sense, TPR and XPS results show the presence of strong interactions between Pt and Sn, with probable alloy formation, which would be responsible for the decrease of the reaction rate and the increase of the activation energy in cyclohexane dehydrogenation. Besides the experiments of cyclopentane hydrogenolysis show that the alkali metal addition to bimetallic PtSn/Al 2 O 3 catalysts completely eliminates the hydrogenolytic ensembles, which could be due to a geometric modification of the metallic phase. These important modifications in the nature of the metallic function due to the simultaneous addition of Na and Sn to Pt/Al 2 O 3 are responsible for the excellent catalytic performance in the n-butane dehydrogenation, thus giving high conversions, selectivities to butenes higher than 95%, and lower deactivation capacity than those corresponding to bimetallic PtSn catalysts (with different Sn contents) supported on undoped alumina. The excellent stability of PtSn/Al 2 O 3 -Na catalysts would be due to a low carbon formation during the reaction, such as it was observed from pulse experiments.

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“…[1][2][3][4][5][6]. One important difference between naphtha reforming and dehydrogenation catalysts is related to their acidic character.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Performance of PtSn Catalysts Supported on Al2O3 and Na-doped Al2O3 in n-butane Dehydrogenation

et al. 2007

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“…Pt-based catalysts supported on alumina are active for naphtha reforming and for dehydrogenation of low and high molecular weight paraffins [1][2][3]. One important difference between naphtha reforming and dehydrogenation catalysts is related to its acid character.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the metallic phase of Pt/Al2O3 and Na-doped Pt/Al2O3 catalysts for light paraffins dehydrogenation

Castro

Guerrero-Ruı́z

Scelza

et al. 2006

Chemical Engineering Journal

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“…This composition was reported to be selective towards propene and to have acceptable long-term stability (Yarusov, Zatolokina, Shitova, Belyi, & Ostrovskii, 1992).…”

Section: Methodsmentioning

confidence: 99%

Membrane reactor microstructured by filamentous catalyst

Kiwi‐Minsker

Wolfrath

Renken

2002

Chemical Engineering Science

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A novel design of microstructured membrane reactor with micro-channels formed between closely packed catalytic ÿlaments is reported. The system comprises ÿlaments of 7 m in diameter and has a laminar ow with a short radial di usion time. This leads to low pressure drop and to a narrow residence time distribution (RTD) during reactor operation.The latter device in combination with a membrane permeable to hydrogen is used in non-oxidative propane dehydrogenation. The catalytic ÿlaments of Pt=Sn on alumina were active=selective and sustained periodic regeneration. This innovative micro-reactor system allowed to control the selectivity to propene due to a narrow RTD. At propane conversions exceeding equilibrium, selectivities towards propene up to 97% were attained. ?

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Propane dehydrogenation over Pt-Sn catalysts

Cited by 37 publications

References 10 publications

Characterization and Catalytic Performance of PtSn Catalysts Supported on Al2O3 and Na-doped Al2O3 in n-butane Dehydrogenation

Characterization and Catalytic Performance of PtSn Catalysts Supported on Al2O3 and Na-doped Al2O3 in n-butane Dehydrogenation

Characteristics of the metallic phase of Pt/Al2O3 and Na-doped Pt/Al2O3 catalysts for light paraffins dehydrogenation

Membrane reactor microstructured by filamentous catalyst

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