Carbon Nanotubes and Activated Carbons Supported Catalysts for Phenol in Situ Hydrogenation: Hydrophobic/Hydrophilic Effect

Xiang, Yizhi; Kong, Ling-niao; Xie, Pengyang; Xu, Tieyong; Wang, Jianguo; Li, Xiaonian

doi:10.1021/ie4035253

Cited by 61 publications

(33 citation statements)

References 21 publications

(60 reference statements)

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“…61 The hydrophobic/ hydrophilic properties of the catalysts were tailored by pretreating the carbonaceous support with HNO 3 . The catalytic results suggested that Pd and Ni supported on CNTs show significantly higher activity than that supported on ACs.…”

Section: Alcoholsmentioning

confidence: 99%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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Section: Alcoholsmentioning

confidence: 99%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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“…To date, varieties of catalysts, including noble metal (Pd [2][3][4][5], Pt [6], Ru [7], and Rh [8]) and non-noble metal (Ni [4,9] and Mo [10]) catalysts, have been developed for this reaction. Among them, noble-metal catalysts are highly active in phenol hydrogenation under mild conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, noble-metal catalysts are highly active in phenol hydrogenation under mild conditions. The industrially preferred Pd/C catalyst has been well studied, including solvents, supports, and various reaction parameters [2][3][4][5], but the results of cyclohexanone selectivity are in consistent and even controversial [5]. As is well known, Pt-based catalysts exhibit excellent properties in many hydrogenation reactions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Cao

Zhu

et al. 2017

Catalysts

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Carbon nanotubes (CNTs)-supported Pt nanoparticles were prepared with selective deposition of Pt nanoparticles inside and outside CNTs (Pt-in/CNTs and Pt-out/CNTs). The effects of Pt loading and reaction solvents on phenol hydrogenation were investigated. The Pt nanoparticles in Pt-in/CNTs versus Pt-out/CNTs are smaller and better dispersed. The catalytic activity and reuse stability toward phenol hydrogenation both improved markedly. The dichloromethane-water mixture as the reaction solvent, compared with either pure medium, decreased the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-in/CNTs, but significantly improved the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-out/CNTs.

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“…To achieve high efficiency in the "one-step" process, the development of a functional catalyst with the special property to control the selective hydrogenation is the key point. Various carriers supported Pd catalysts were developed for phenol hydrogenation, such as Pd/MgO [4,5], Pd/Al2O3 [6,7], Pd/AC(CNT) [8,9], Pd-Ce-B/hydrotalcite [1,2], etc. The nature of the support plays an important role in the activity and selectivity of Pd catalysts for the hydrogenation of phenol [10].…”

Section: Introductionmentioning

confidence: 99%

Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts

Fan

Shen

Liu

et al. 2016

Bull. Chem. React. Eng. Catal.

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The ZSM-5, -Al2O3, SiO2 and MgO supported Pd-catalysts were prepared for the phenol hydrogenation to cyclohexanone in liquid-phase. The natures of these catalysts were characterized by XRD, N2 adsorption-desorption analysis, H2-TPR, CO2-TPD and NH3-TPD. The catalytic performance of the supported Pd-catalyst for phenol hydrogenation to cyclohexanone is closely related to nature of the support and the size of Pd nanoparticles. The Pd/MgO catalyst which possesses higher basicity shows higher cyclohexanone selectivity, but lower phenol conversion owing to the lower specific surface area. The Pd/SiO2 catalyst prepared by precipitation gives higher cyclohexanone selectivity and phenol conversion, due to the moderate amount of Lewis acidic sites, and the smaller size and higher dispersion of Pd nanoparticles on the surface. Under the reaction temperature of 135 o C and H2 pressure of 1 MPa, after reacting for 3.5 h, the phenol conversion of 71.62% and the cyclohexanone selectivity of 90.77% can be obtained over 0.5 wt% Pd/SiO2 catalyst.

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Carbon Nanotubes and Activated Carbons Supported Catalysts for Phenol in Situ Hydrogenation: Hydrophobic/Hydrophilic Effect

Cited by 61 publications

References 21 publications

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts

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