Palladium Nanoparticles Supported on Titanate Nanobelts for Solvent‐Free Aerobic Oxidation of Alcohols

Lu, Yongming; Zhu, Haizhou; Liu, Jian‐Wei; Yu, Shu‐Hong

doi:10.1002/cctc.201500491

Cited by 32 publications

(22 citation statements)

References 36 publications

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“…Here the presence of a methoxy substituent at the ortho position partly prevents the transformation. This phenomenon has been recently observed with Pd-catalysts under similar conditions and steric hindrance was given as the reason for this lower reactivity [58,59]. Veratryl alcohol oxidation was rarely reported using Pd catalysts, even more with O 2 as oxidant [60][61][62][63][64][65].…”

Section: Application To the Oxidation Of Benzyl Alcoholssupporting

confidence: 55%

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

et al. 2021

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This study concerns one of the rare applications of a suspension of palladium nanoparticles in water for oxidation reactions. The aqueous suspension containing well dispersed nanoparticles of 3.85 nm was obtained following a straightforward procedure involving the reduction of Na 2 PdCl 4 with NaBH 4 in the presence of PVP as stabilizing agent. In the way of oxidative catalytic valorisation of lignin, the aqueous suspension was directly applied as catalytic medium for the selective oxidation of vanillic alcohol into vanillin (80 °C, O 2 , 1 h) with more than 90% yield. Reusability of the catalytic medium has been demonstrated, acting as "quasi-homogeneous catalyst". More sophisticated lignin-derived substrates like veratryl alcohol and hydrobenzoin gave yields of 50-80% to the respective aldehyde and ketone. In parallel, this as-synthesized suspension was directly used to prepare a Pd/TiO 2 catalyst, the latter showing less efficiency for the catalytic transformations.

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Section: Application To the Oxidation Of Benzyl Alcoholssupporting

confidence: 55%

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

et al. 2021

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“…More innovative support structures have also been investigated in an attempt to find unconventional ways of improving the catalytic performance of Pd NPs. Titanate nanobelts were investigated as support for Pd NPs for the same reaction [66]. Pd NPs were immobilized on the uncalcined and calcined titanate nanobelts by polyol reduction and tested at 120 • C in an oil bath under continuous oxygen stream.…”

Section: Oxidesmentioning

confidence: 99%

Selective Benzyl Alcohol Oxidation over Pd Catalysts

2018

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In the last decades, the selective liquid phase oxidation of alcohols to the corresponding carbonyl compounds has been a subject of growing interest. Research has focused on green methods that use “clean” oxidants such as O2 in combination with supported metal nanoparticles as the catalyst. Among the alcohols, benzyl alcohol is one of the most studied substrates. Indeed, benzyl alcohol can be converted to benzaldehyde, largely for use in the pharmaceutical and agricultural industries. This conversion serves as model reaction in testing new potential catalysts, that can then be applied to other systems. Pd based catalysts have been extensively studied as active catalytic metals for alcohol oxidation for their high activity and selectivity to the corresponding aldehyde. Several catalytic materials obtained by careful control of the morphology of Pd nanoparticles, (including bimetallic systems) and by tuning the support properties have been developed. Moreover, reaction conditions, including solvent, temperature, pressure and alcohol concentration have been investigated to tune the selectivity to the desired products. Different reaction mechanisms and microkinetic models have been proposed. The aim of this review is to provide a critical description of the recent advances on Pd catalyzed benzyl alcohol oxidation.

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“…The selective oxidation of alcohols to corresponding carbonyl compounds, e.g., aldehydes or ketones, is one of the most important transformations in the synthesis of fine chemicals [61,[118][119][120][121]. Traditional methods for performing such oxidation processes employ transition metal salts or organometallic complexes as homogeneous catalysts and involve inorganic oxidations, notably permanganate, chromate, bromate, and chromium(VI) re- …”

Section: Oxidation Reactionsmentioning

confidence: 99%

“…12 gents. Considering environmental and economic concerns, there is a great demand for using molecular oxygen as primary oxidation [120][121][122][123]. Moreover, homogeneous catalytic systems have difficulties in catalyst separation from the reaction medium and repeated utilization.…”

Section: Science China Materialsmentioning

confidence: 99%

“…A well-designed heterogeneous catalyst may solve this dilemma because of its facile handling and reusability [122][123][124]. Many noble metal catalysts have been explored, e.g., Pt [125][126][127], Au [118,128,129], Ru [130][131][132], and Pd [61,123,124], as well as various supports such as Al 2 O 3 [133,134], TiO 2 [119,120], MgO [135,136], CeO 2 [128,129], and SiO 2 [123,137], as well as carbon, for use in the liquid phase oxidation of alcohol. Specially, Pd NPs supported on carbon materials such as AC, CNTs, and hollow porous carbon spheres [138][139][140] are recognized as model heterogeneous catalysts for selective oxidation.…”

Section: Science China Materialsmentioning

confidence: 99%

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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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Palladium Nanoparticles Supported on Titanate Nanobelts for Solvent‐Free Aerobic Oxidation of Alcohols

Cited by 32 publications

References 36 publications

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Selective Benzyl Alcohol Oxidation over Pd Catalysts

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

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