Effect of the acid–base properties of Pd–Ca/Al2O3 catalysts on the selective hydrogenation of phenol to cyclohexanone: FT-IR and TPD characterization

Scirè, Salvatore; Crisafulli, C.; Maggiore, R.; Minicò, Simona; Galvagno, S.

doi:10.1016/s0169-4332(98)00351-1

Cited by 39 publications

(19 citation statements)

References 29 publications

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“…It is reported that, for phenol hydrogenation to cyclohexanol, the higher the basicity (or the lower the acidity) of the catalyst, the higher the activity and the selectivity to cyclohexanone [6,10,12,25]. Among these four catalysts in this work, Pd/MgO shows the highest basicity and the highest cyclohexanone selectivity.…”

Section: Catalytic Activity Testmentioning

confidence: 70%

“…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%

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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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Section: Catalytic Activity Testmentioning

confidence: 70%

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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“…[22,23] The presence of basic sites explainsthe improved catalytic performance of Ca-based catalysts in both reactions, the FA decomposition and LA hydrogenation, regardless of the catalystp reparation method. The role of modification with Ca 2 + was also strongly associated with the increase in the concentration ands trengtho fs urface basic sites.…”

Section: Discussionmentioning

confidence: 99%

“…[22,23] For instance, the nature of alumina supports has been reported to strongly shift from acidic to basic by the addition of more Ca. Indeed, it has been reported that the doping of metal oxide with aC a promotor can causeanincreaseint he number and strength of basic sites, in the form of coordinatelyu nsaturated oxygen ions O 2À .…”

Section: Characterization Of Tio 2 and Ca-modified Tio 2 Supportsmentioning

confidence: 99%

“…Indeed, it has been reported that the doping of metal oxide with aC a promotor can causeanincreaseint he number and strength of basic sites, in the form of coordinatelyu nsaturated oxygen ions O 2À . [22,23] For instance, the nature of alumina supports has been reported to strongly shift from acidic to basic by the addition of more Ca. [22,23] Therefore the Ca-modified samples required the addition of ah ighera mount of H + during the zeta potentialm easurement for neutralizing the more negative surface by charge compensation, resulting in the measurement of al ower isoelectricp oint.…”

Section: Characterization Of Tio 2 and Ca-modified Tio 2 Supportsmentioning

confidence: 99%

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Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO₂ Supported Ru Catalysts

et al. 2019

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Invited for this month's cover are the groups from Lodz University of Technology (Poland) and from the University of Strasbourg (France). The image shows the interest of a fine light‐driven tuning of the ruthenium nanoparticle size on titania supports for designing highly active and selective catalysts for biomass valorization. The Full paper itself is available at https://doi.org/10.1002/cssc.201801947.

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Selective Hydrogenation of Phenol

et al. 2018

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The selective hydrogenation of phenol to cyclohexanone has attracted a great deal of attention both in industry and academia. In this review, the significance, strategies and mechanisms for the production of cyclohexanone are briefly described. Then, the evolution of phenol hydrogenation in gas/liquid phase is summarized according to catalyst type. In situ hydrogenation techniques including catalytic transfer hydrogenation (CTH) and electrocatalytic hydrogenation (ECH) of phenol are also discussed. Although the technology for catalyst design has developed rapidly within the past decades, direct evidence to understand the reaction mechanisms and kinetics is still scarce. Therefore, it is still challengingto explore the function mechanisms and design advanced catalysts with high activity and high selectivity (>95%) for direct hydrogenation of phenol to cyclohexanone. This review may provide guidance for these attempts.

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Effect of the acid–base properties of Pd–Ca/Al2O3 catalysts on the selective hydrogenation of phenol to cyclohexanone: FT-IR and TPD characterization

Cited by 39 publications

References 29 publications

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

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

Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO₂ Supported Ru Catalysts

Selective Hydrogenation of Phenol

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Effect of the acid–base properties of Pd–Ca/Al2O3 catalysts on the selective hydrogenation of phenol to cyclohexanone: FT-IR and TPD characterization

Cited by 39 publications

References 29 publications

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

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

Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO2 Supported Ru Catalysts

Selective Hydrogenation of Phenol

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Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO₂ Supported Ru Catalysts