Supported Pt–Sn catalysts highly selective for isobutane dehydrogenation: preparation, characterization and catalytic behavior

Llorca, Jordi; Homs, Narcı́s; León, J.N. Díaz de; Sales, Joaquim; Fierro, J.L.G.; Piscina, Pilar Ramı́rez de la

doi:10.1016/s0926-860x(99)00253-7

Cited by 116 publications

(55 citation statements)

References 18 publications

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“…There is controversy in literature about the oxidation state of Sn, and an effect of the support material, Pt-to-Sn ratio and preparation method is suggested [17,19,21,24].…”

Section: And Refs Therein)mentioning

confidence: 99%

“…After drying, the obtained Mg 9.6 Al 2 (OH) 19 (30 mL). The hydrotalcite (1.00 g) was added to the salt solution under stirring.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Most studies report advantageous effects of promoting Pt catalysts with Sn: Tin promotion improves catalytic activity, dehydrogenation selectivity, prevents Pt sintering, and decreases deactivation due to coke formation (see e.g. [4,[16][17][18][19][20][21][22][23] …”

Section: Introductionmentioning

confidence: 99%

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In situ XPS investigation of Pt(Sn)/Mg(Al)O catalysts during ethane dehydrogenation experiments

et al. 2007

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Calcined hydrotalcite with or without added metal (Mg(Al)O, Pt/Mg(Al)O and Pt,Sn/Mg(Al)O) have been investigated with in situ X-ray Photoelectron Spectroscopy (XPS) during ethane dehydrogenation experiments. The temperature in the analysis chamber was 450ºC and the gas pressure was in the range 0.3 -1 mbar. Depth profiling of calcined hydrotalcite and platinum catalysts under reaction, oxidation and in hydrogenwater mixture was performed by varying the photon energy, covering an analysis depth of 10-21 Å. It was observed that the Mg/Al ratio in the Mg(Al)O crystallites does not vary significantly in the analysis depth range studied. This result indicates that Mg and Al are homogeneously distributed in the Mg(Al)O crystallites. Catalytic tests have shown that the initial activity of a Pt,Sn/Mg(Al)O catalyst increases during an activation period consisting of several cycles of reduction -dehydrogenation -oxidation. The Sn/Mg ratio in a Pt,Sn/Mg(Al)O catalyst was followed during several such cycles, and was found to increase during the activation period, probably due to a process where tin spreads over the carrier material and covers an increasing fraction of the Mg(Al)O surface. The results further indicate that spreading of tin occurs under reduction conditions. A PtSn 2 alloy was studied separately. The surface of the alloy was enriched in Sn during reduction and reaction conditions at 450°C. Binding energies were determined and indicated that Sn on the particle surface is predominantly in an oxidized state under reaction conditions, while Pt and a fraction of Sn is present as a reduced Pt-Sn alloy.

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“…There is controversy in literature about the oxidation state of Sn, and an effect of the support material, Pt-to-Sn ratio and preparation method is suggested [17,19,21,24].…”

Section: And Refs Therein)mentioning

confidence: 99%

“…After drying, the obtained Mg 9.6 Al 2 (OH) 19 (30 mL). The hydrotalcite (1.00 g) was added to the salt solution under stirring.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

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In situ XPS investigation of Pt(Sn)/Mg(Al)O catalysts during ethane dehydrogenation experiments

et al. 2007

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“…Of particular interest is Pt-Sn bimetallic particles used for the electro-oxidation of ethanol at the anode of low temperature fuel cells [1][2][3][4][5][6][7][8][9]. Supported Pt-Sn with low loadings (<5%) has been studied well as a catalyst for ethanol or gasoline reforming at high temperature in the past decades [10][11][12][13]. However, to the best of our knowledge, few studies on the microchemistry of high loading supported Pt-Sn catalysts employed in low temperature direct ethanol fuel cells has been reported.…”

Section: Introductionmentioning

confidence: 99%

Structure and chemical composition of supported Pt–Sn electrocatalysts for ethanol oxidation

Jiang

Sun

et al. 2005

Electrochimica Acta

269

153

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“…The bimetallic Pt-Sn/γ-Al 2 O 3 catalysts have been extensively studied and a number of active and selective catalysts have been developed and patented [2][3][4][5][6][7][8][9]. It is generally agreed that the promoter effect of Sn is a result of combined influence of geometric as well as electronic factors [ 6,11,12 ]. γ-Al 2 O 3 has been widely used as supporting material for the dehydrogenation catalysts, but its acidity leads to proceeding of hydrocarbons cracking and hence to coke formation.…”

mentioning

confidence: 99%

Correlation between Melting Temperatures of Alkaline Earth Elements and Their Effect as Promoters of Pt-Sn/γ-Al2O3 Catalyst in Propane Dehydrogenation Reaction

Alhamed¹,

Umar²,

Daous³

et al. 2013

Proceeding BAS

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Pt-Sn/Al 2 O 3 catalyst is well known to have good activity and selectivity for propane dehydrogenation reaction but suffers quick deactivation due to substantial coke formation. In this study effort has been made to improve the characteristics of this catalyst by making tri-metallic catalyst supported on gamma alumina. Pt-Sn-Ca/Al 2 O 3 catalyst was found best among these, especially in yielding improved results in terms of conversion, selectivity, yield and less coke formation. Calcium contents of the catalyst composition were also varied to attain the most suitable amount. Propane conversion, propylene selectivity and yield at optimum operation conditions were: 43.2%, 95.3% and 35.8% respectively at 575 • C. The catalysts were characterized by TEM, XPS, SEM-EDX, H2-TPR, NH3-TPD, CO titration and TGA techniques.

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Supported Pt–Sn catalysts highly selective for isobutane dehydrogenation: preparation, characterization and catalytic behavior

Cited by 116 publications

References 18 publications

In situ XPS investigation of Pt(Sn)/Mg(Al)O catalysts during ethane dehydrogenation experiments

In situ XPS investigation of Pt(Sn)/Mg(Al)O catalysts during ethane dehydrogenation experiments

Structure and chemical composition of supported Pt–Sn electrocatalysts for ethanol oxidation

Correlation between Melting Temperatures of Alkaline Earth Elements and Their Effect as Promoters of Pt-Sn/γ-Al2O3 Catalyst in Propane Dehydrogenation Reaction

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