Deactivation studies of a carbon supported AuPt nanoparticulate catalyst in the liquid-phase aerobic oxidation of 1,2-propanediol

D’Agostino, Carmine; Ryabenkova, Yulia; Miedziak, Peter J.; Taylor, Stuart Hamilton; Hutchings, Graham J.; Gladden, Lynn F.; Mantle, Mick D.

doi:10.1039/c4cy00027g

Cited by 38 publications

(40 citation statements)

References 39 publications

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“…FT‐IR spectra of the WH solid acids after five consecutive esterification/dehydration cycles (Supporting Information) show several differences on comparison with those of freshly prepared material. Covering of the surface by reaction products, as indicated by greater intensity C−H stretching vibrations in spent catalysts, is expected to lead to further reduced surface area, pore diameter, and pore volume, as indicated through prior work by D′Agostino and co‐workers …”

Section: Resultsmentioning

confidence: 94%

“…Covering of the surface by reaction products, as indicatedb yg reater intensity CÀHs tretching vibrations in spent catalysts, is expected to lead to furtherr educed surfacea rea, pore diameter,a nd pore volume, as indicated throughp rior work by D'Agostino and co-workers. [32] The deactivation or reduced catalytic performance of WH-PTSA catalysts on prolonged use can be explained based on FTIR data, as the result of active site contamination and some leaching of acidic sulfonate/sulfonic species. Decreasesi n -SO 3 Hv ibrationi ntensities( 1034cm À1 and 1160 cm À1 )r elative to fresh WH solid acids ( Figure 2D)s uggest leaching of, or gradualp oisoning of, these sites by water,w ith hydration of the catalysts urfaceb eing evident through enhanced broaden- ing of the O-H stretching vibration in reused catalystm aterials.…”

Section: Solid Acid Catalyst Reusability Profilesmentioning

confidence: 99%

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One‐step Preparation of Carbon‐based Solid Acid Catalyst from Water Hyacinth Leaves for Esterification of Oleic Acid and Dehydration of Xylose

Laohapornchaiphan

Smith

2017

Chemistry An Asian Journal

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Carbon-based solid acid catalysts were successfully obtained via one-step hydrothermal carbonization (HTC) of water hyacinth (WH) in the presence of p-toluenesulfonic acid (PTSA). Increasing the HTC temperature from 180 to 240 °C resulted in carbonaceous materials with increased sulfur content and less adsorbed water. The material obtained at 220 °C (WH-PTSA-220) contains the highest amount of acid sites and promotes the highest initial rate of two transformations, that is, methanolysis of oleic acid and dehydration of xylose to furfural. While all PSTA-treated WH catalysts gave comparable fatty acid conversions (≈97 %) and furfural yields (≈60 %) after prolonged reaction times, the WH-PTSA-240 system bearing a relatively low acid density maintains the most favorable reusability profile. Higher HTC temperatures (220-240 °C) improved the catalyst reusability profiles due to graphitization and hydrophobicity of the carbon surface. The catalyst systems derived herein from biomass may have potential applications in biorefining platforms, utilizing the conversion of waste biomass to chemicals.

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Section: Resultsmentioning

confidence: 94%

Section: Solid Acid Catalyst Reusability Profilesmentioning

confidence: 99%

One‐step Preparation of Carbon‐based Solid Acid Catalyst from Water Hyacinth Leaves for Esterification of Oleic Acid and Dehydration of Xylose

Laohapornchaiphan

Smith

2017

Chemistry An Asian Journal

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“…Recently, some NMR‐based morphological studies of regular and irregular monolithic structures have been reported . Grosse et al investigated the porosity, pore size distribution, and other properties of heterogeneous structures.…”

Section: Introductionmentioning

confidence: 99%

“…NMR of thermally polarized gases is more challenging in comparison with that of liquids, due to reduced spin density, faster movements of the molecules, and the short transversal relaxation time T 2 , which cause a considerably reduced signal‐to‐noise ratio (SNR) in gas phase NMR , , . As a solution, studies on hyperpolarized gases have been published .…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Characterization of the Gas Propagator in Monolithic Structured Catalysts Using NMR Diffusiometry

et al. 2018

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Gas diffusivity measurements in opaque porous media were performed using nuclear magnetic resonance. An optimized pulsed-field gradient stimulated echo method with free volume selection was used to investigate the propagator of thermally polarized methane gas within commercial monolithic catalyst supports. Since signal losses due to T 2 relaxation were minimized by using a short echo time, diffusion processes could be characterized by the measured propagator functions and effective diffusion coefficients were determined for a broad range of observation times and in different spatial directions. The study of this noninvasive characterization of gas diffusion found a clear effect of the monolith type and its pore size and coating on the effective gas diffusion coefficient and the apparent tortuosity for a given observation time.

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“…2,3 There are two lactic acid production processes, namely microbial fermentation and chemical synthesis. 6 Recently, selective catalytic oxidation of 1,2-propanediol has been considered as a green chemical route for lactic acid synthesis, 5,[7][8][9][10][11][12][13][14][15][16] which is due to the high lactic acid selectivity obtained in the catalytic oxidation of renewable 1,2-propanediol under mild reaction conditions. 4 However, the production of lactic acid by microbial fermentation is limited by the substrate and operating cost.…”

Section: Introductionmentioning

confidence: 99%

Selective oxidation of 1,2-propanediol to lactic acid catalyzed by hydroxyapatite-supported Pd and Pd–Ag nanoparticles

et al. 2015

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Selective catalytic oxidation of 1,2-propanediol is an alternative, effective, and environmentally benign method for producing lactic acid. Hydroxyapatite-supported Pd (Pd/HAP) and Pd-Ag (Pd-Ag/HAP) catalysts were prepared by the sol-immobilization method. The as-prepared catalysts were characterized by XRD, TEM, HRTEM, XPS, BET, and CO 2 -TPD techniques. The average particle sizes of Pd nanocubes in Pd/HAP catalysts were tuned from 6 to 18 nm by changing the amount of KBr and PVP, which significantly affected the 1,2-propanediol conversion and the lactic acid selectivity. Pd/HAP catalyst with cubic Pd nanoparticles was more selective to lactic acid than Pd/HAP catalyst with spherical Pd nanoparticles in the oxidation of 1,2-propanediol. The coalesced Pd and Ag nanoparticles in Pd-Ag/HAP bimetallic catalysts synergistically catalyzed the oxidation of 1,2-propanediol to lactic acid. The support HAP with high basicity promoted the oxidation of 1,2-propanediol to lactic acid. When the catalytic oxidation of 1,2-propanediol with O 2 was carried out at 100 C for 2 h in an alkaline solution, the lactic acid selectivity was 86.2% at the 1,2-propanediol conversion of 96.2% over Pd 2 /HAP-6 catalyst while the lactic acid selectivity was 88.8% at the 1,2-propanediol conversion of 86.3% over Pd 1 Ag 1 /HAP catalyst.The activation energies for the catalytic oxidation of 1,2-propanediol were in the order of E a (

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Deactivation studies of a carbon supported AuPt nanoparticulate catalyst in the liquid-phase aerobic oxidation of 1,2-propanediol

Abstract: The aerobic oxidation of 1,2-propanediol in alkaline aqueous solvent over bimetallic AuPt/C catalysts has been studied and catalyst reusability has been assessed.

Cited by 38 publications

References 39 publications

One‐step Preparation of Carbon‐based Solid Acid Catalyst from Water Hyacinth Leaves for Esterification of Oleic Acid and Dehydration of Xylose

One‐step Preparation of Carbon‐based Solid Acid Catalyst from Water Hyacinth Leaves for Esterification of Oleic Acid and Dehydration of Xylose

Spatially Resolved Characterization of the Gas Propagator in Monolithic Structured Catalysts Using NMR Diffusiometry

Selective oxidation of 1,2-propanediol to lactic acid catalyzed by hydroxyapatite-supported Pd and Pd–Ag nanoparticles

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