In situ ATR-IR study on aqueous phase reforming reactions of glycerol over a Pt/γ-Al2O3 catalyst

Copeland, John R.; Foo, Guo Shiou; Harrison, Lindsey A.; Sievers, Carsten

doi:10.1016/j.cattod.2012.08.002

Cited by 36 publications

(35 citation statements)

References 50 publications

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“…The evanescent wave in the ATR-FTIR spectroscopy probes both the bulk liquid and the liquid-solid interface within its penetration depth from the top of the ZnSe crystal 76 . Thus, spectra contain signals from species both dissolved in the bulk solution and adsorbed on the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Understanding solvent effects on adsorption and protonation in porous catalysts

Gould

Cho

et al. 2020

Nat Commun

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Solvent selection is a pressing challenge in developing efficient and selective liquid phase catalytic processes, as predictive understanding of the solvent effect remains lacking. In this work, an attenuated total reflection infrared spectroscopy technique is developed to quantitatively measure adsorption isotherms on porous materials in solvent and decouple the thermodynamic contributions of van der Waals interactions within zeolite pore walls from those of pore-phase proton transfer. While both the pore diameter and the solvent identity dramatically impact the confinement (adsorption) step, the solvent identity plays a dominant role in proton-transfer. Combined computational and experimental investigations show increasingly favorable pore-phase proton transfer to pyridine in the order: water < acetonitrile < 1,4dioxane. Equilibrium methods unaffected by mass transfer limitations are outlined for quantitatively estimating fundamental thermodynamic values using statistical thermodynamics.

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Section: Resultsmentioning

confidence: 99%

Understanding solvent effects on adsorption and protonation in porous catalysts

Gould

Cho

et al. 2020

Nat Commun

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“…Contributions from liquid molecules are minimized, since the light does not transmit through the liquid. [32,35] internal reflection. Adapted with permission from [24,33] Copyright (2003,2006), respectively, with permission from American Chemical Society.…”

Section: Spectroscopic Methods For Use In Aqueous Phasementioning

confidence: 99%

On the water structure at hydrophobic interfaces and the roles of water on transition-metal catalyzed reactions: A short review

et al. 2017

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Interest into the roles of water on aqueous phase heterogeneous catalysis is burgeoning. This short review summarizes the influences of hydrogen bonding on adsorption and how water molecules act as co-catalysts in aqueous phase heterogeneous catalysis. These phenomena, which involve interactions and/or reactions with "dangling" hydroxide or hydroxyl groups from nearby water molecules, are related to interfacial phenomena that have been observed at water/oil interfaces in organic synthesis. The hypothesized water structures at water/oil interfaces in organic synthesis is presented, and predictions about how analogous structural effects could influence catalytic chemistry at water/transition metal interfaces are discussed. The focus of this review is on computational methods and observations, but some experimental methods and findings are discussed briefly as well.

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“…Table S2 summarizes the main bands observed in the region of 1800-1300 cm −1 after glycerol adsorption. The adsorbed glycerol is characterized by typical bands at 1462 cm −1 (δCH 2 ), 1410 cm −1 (δOH), and 1345 cm −1 (δCH) [46]. At low temperatures (60 and 100 • C), more glycerol was adsorbed on NMZ-50 than CMZ-50.…”

Section: Effects Of Nanosheet Structure On the Catalytic Performance mentioning

confidence: 99%

Nanosheet MFI Zeolites for Gas Phase Glycerol Dehydration to Acrolein

Shan

Zhu

et al. 2019

Catalysts

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To overcome the rapid deactivation of conventional ZSM-5, novel nanosheet MFI zeolites, with different Si/Al molar ratios were well fabricated. It was found that Si/Al molar ratios, do not just affect acid properties, but also determine the morphologies of nanosheet MFI zeolites by changing a-c plane areas of zeolite nanosheets. In reaction of gas phase glycerol dehydration to acrolein, the nanosheet MFI zeolites were much more active and stable than conventional ZSM-5 catalysts, owing to their suitable acidity and unique nanosheet structure. For nanosheet MFI zeolite, with Si/Al = 50 (NMZ-50), the conversion of glycerol is higher than 99% in the initial 12 h, with an acrolein selectivity of 86.6%, better than most previous reports. This superior stability of NMZ-50 can be ascribed to its low coke deposition rate and improved coke tolerance capacity. Additionally, it is interesting to find that Al contents do not just simply affect acid properties, but also determine morphologies of nanosheet MFI zeolites, and thus influence catalytic performance.

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In situ ATR-IR study on aqueous phase reforming reactions of glycerol over a Pt/γ-Al2O3 catalyst

Cited by 36 publications

References 50 publications

Understanding solvent effects on adsorption and protonation in porous catalysts

Understanding solvent effects on adsorption and protonation in porous catalysts

On the water structure at hydrophobic interfaces and the roles of water on transition-metal catalyzed reactions: A short review

Nanosheet MFI Zeolites for Gas Phase Glycerol Dehydration to Acrolein

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