Effect of surface functional groups on hydrogen adsorption properties of Pd dispersed reduced graphene oxide

Das, Tapas; Banerjee, S.; Pandey, M.; Vishwanadh, B.; Kshirsagar, R.J.; Sudarsan, V.

doi:10.1016/j.ijhydene.2016.12.024

Cited by 39 publications

(35 citation statements)

References 48 publications

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“…Ideally, the metal particles should have a narrow size distribution and be uniformly distributed across the support to arrive at increased activity and stability. However, particles are often distributed nonuniformly or the particle‐size distributions are broad or multimodal …”

Section: Figurementioning

confidence: 99%

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

2018

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The effects of the metal deposition and activation methods on metal particle size and distribution were investigated for carbon nanotube supported Pd catalysts. The Pd precursor was loaded by incipient wetness impregnation, ion adsorption, and deposition precipitation and was activated by thermal treatment under a nitrogen atmosphere or in the liquid phase by reduction by formaldehyde or sodium borohydride. Regardless of the metal precursor loading method, activation under a N2 atmosphere at 500 °C led to homogeneously distributed 4 nm Pd particles. Liquid‐phase reduction by sodium borohydride provided a bimodal distribution with particle sizes of approximately 1 and >10 nm. A somewhat weaker reducing agent, formaldehyde, yielded particles approximately 1 nm in size. The activities of the catalysts for the hydrogenation of cinnamaldehyde correlated with the particle sizes.

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Section: Figurementioning

confidence: 99%

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

2018

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“…7). A signal at 165 ppm was attributed to the carbonyl fragment of the GOQDs, 66,67 while a series of signals at 100-115 ppm were assigned to sp 2 carbons in the basal plane of graphene. 68 Consequently, the 13 C NMR spectrum of SiO 2 -GOQDs as well as the FTIR and Raman spectra demonstrates an essential fraction of oxygen-containing fragments in GOQDs and proves the immobilization of the GOQDs in the porous network of silica.…”

Section: Composition Of Sio 2 -Goqdsmentioning

confidence: 99%

Graphene oxide quantum dots immobilized on mesoporous silica: preparation, characterization and electroanalytical application

et al. 2020

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“…Increasing the hydrophobicity of supports through a surface silylation or hydroxyl-rich treatment of supports appears to enhance the microemulsion-support interaction and also to avoid extensive agglomeration of metal particles during deposition of metal NPs from reverse micelles [96,97]. Recently, Banerjee et al [103] successfully prepared Pd/rGO composites from graphite and PdCl 2 precursors using a reverse micro-emulsion method. The Pd NPs were well dispersed on graphene sheets with size in the range of 6-9 nm.…”

Section: Reverse Micro-emulsionsmentioning

confidence: 99%

“…Besides noble metal Pd, other active metals, such as Au and Ag, have also been provided for oxidation of alcohols. Das and co-workers [103] synthesized Au/rGO using ascorbic acid as a reducing agent by microwave irradiation. The spherical Au NPs on rGO were obtained with a size range of 2-20 nm and the composite performed promising catalytic activity toward the halogenand solvent-free oxidation of substituted benzyl alcohol by O 2 to their corresponding aldehydes with good selectivity and yields.…”

Section: Science China Materialsmentioning

confidence: 99%

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Huang

2017

Sci. China Mater.

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Graphitized nanocarbon materials can be an ideal catalyst support for heterogeneous catalytic systems. Their unique physical and chemical properties, such as large surface area, high adsorption capacity, excellent thermal and mechanical stability, outstanding electronic properties, and tunable porosity, allow the anchoring and dispersion of the active metals. Therefore, currently they are used as the key support material in many catalytic processes. This review summarizes recent relevant applications in supported catalysts that use graphitized nanocarbon as supports for catalytic oxidation, hydrogenation, dehydrogenation, and C-C coupling reactions in liquid-phase and gas-solid phase-reaction systems. The latest developments in specific features derived from the morphology and characteristics of graphitized nanocarbon-supported metal catalysts are highlighted, as well as the differences in the catalytic behavior of graphitized nanocarbon-supported metal catalysts versus other related catalysts. The scientific challenges and opportunities in this field are also discussed. Keywords: nanocarbon materials; graphitized carbon supports; metal catalysts; hetergeneous catalysis INTRODUCTIONCarbon combines its atoms in diverse hybridization states (sp, sp 2 , sp 3 ) to form a variety of polymorphs. These are composed entirely of carbon but have different physical structures and different names, including diamond, graphite, fullerenes, and carbines, among others [1][2][3][4][5]. Because these various and versatile allotropes produce materials with a large range of properties, carbon materials can be used in a number of technological processes, including high-tech catalytic ones [6][7][8][9][10].In heterogeneous catalysis, carbon material plays wellestablished and important roles in a wide range of applications, both as catalyst in its own right and as a unique support material [11][12][13][14][15]. The chemical stability of carbon supports in some specifically aqueous phase biomass conversion surpasses that of metal oxide materials; in addition, carbon materials present other common and key advantages as support materials for catalysis [1,5]. From the point of physical structure, porous carbon can be prepared in different forms (granules, cloth, fibers, pallets, etc.). Due to its chemical properties, carbon structure is resistant to both acidic and basic media. The structure of carbon is stable at high temperature (even above 1023 K under inert atmosphere). The hydrophilic/ hydrophobic nature of carbon can be easily modified. Active metals on the support can be easily reduced. For the purposes of industrial economy and environment, the active phase can be easily recovered. Conventional carbon supports are lower-cost and more easily available than other conventional supports. Although several kinds of carbon materials have been studied, active carbon (AC) [12,[16][17][18][19] and, to a lesser extend, carbon black [20][21][22][23] have long been the most commonly used carbon supports. AC is an amorphous solid prepa...

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Effect of surface functional groups on hydrogen adsorption properties of Pd dispersed reduced graphene oxide

Cited by 39 publications

References 48 publications

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

Graphene oxide quantum dots immobilized on mesoporous silica: preparation, characterization and electroanalytical application

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

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