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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b00465
|2 doi
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|a pubmed24n0939.xml
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Van Cleve, Tim
|e verfasserin
|4 aut
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| 245 |
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|a Enhanced Hydrothermal Stability of γ-Al2O3 Catalyst Supports with Alkyl Phosphonate Coatings
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 06.07.2018
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|a Date Revised 06.07.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In this study, monolayers formed from organophosphonic acids were employed to stabilize porous γ-Al2O3, both as a single component and as a support for Pt nanoparticle catalysts, during exposure to hydrothermal conditions. To provide a baseline, structural changes of uncoated γ-Al2O3 catalysts under model aqueous phase reforming conditions (liquid water at 200 °C and autogenic pressure) were examined over the course of 20 h. These changes were characterized by X-ray diffraction, NMR spectroscopy, N2 physisorption, and IR spectroscopy. It was demonstrated that γ-alumina was rapidly converted into a hydrated boehmite (AlOOH) phase with significantly decreased surface area. Deposition of alkyl phosphonate groups on γ-alumina drastically inhibited the formation of boehmite, thereby maintaining its high specific surface area over 20 h of treatment. 27Al MAS NMR spectra demonstrated that hydrothermal stability increased with alkyl tail length despite lower P coverages. Although the inhibition of boehmite formation by the phosphonic acids was attributed primarily to the formation of Al2O3-PO x bonds, it was found that use of longer-chain octadecylphosphonic acids led to the most pronounced effect. Phosphonate coatings on Pt/γ-Al2O3 improved stability without adversely affecting the rate of a model reaction, catalytic hydrogenation of 1-hexene
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Underhill, Devon
|e verfasserin
|4 aut
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|a Veiga Rodrigues, Mariana
|e verfasserin
|4 aut
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|a Sievers, Carsten
|e verfasserin
|4 aut
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|a Medlin, J Will
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 34(2018), 12 vom: 27. März, Seite 3619-3625
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|x 1520-5827
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| 773 |
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|g volume:34
|g year:2018
|g number:12
|g day:27
|g month:03
|g pages:3619-3625
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|u http://dx.doi.org/10.1021/acs.langmuir.8b00465
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