Activated Carbon from Renewable Material as an Efficient Support for Palladium Oxidation Catalysts

Topka, Pavel; Hejtmánek, Vladimı́r; Cruz, Gerardo J. F.; Šolcová, Olga; Soukup, Karel

doi:10.1002/ceat.201800611

Cited by 11 publications

(7 citation statements)

References 25 publications

(28 reference statements)

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“…In all cases, the 0.54 Pt/PBI catalyst was the most active, whereas the 0.08 Pt/PBI and 0.68 Pt/PBI catalysts exhibited a lower catalytic activity. It is well-known that the Pt dispersion is a major factor affecting the intrinsic activity in VOC oxidation, and that the reaction rates increase with increasing metal particle sizes [ 33 ]. This is due to the decrease in the Pt–O bond strength with the enlargement in the Pt particle size, which leads to more reactive adsorbed oxygen species on Pt sites [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

Platinum Nanoparticles Immobilized on Electrospun Membranes for Catalytic Oxidation of Volatile Organic Compounds

Soukup

Topka²,

Kupčı́k³

et al. 2023

Membranes

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Structured catalytic membranes with high porosity and a low pressure drop are particularly suitable for industrial processes carried out at high space velocities. One of these processes is the catalytic total oxidation of volatile organic compounds, which is an economically feasible and environmentally friendly way of emission abatement. Noble metal catalysts are typically preferred due to high activity and stability. In this paper, the preparation of a thermally stable polybenzimidazole electrospun membrane, which can be used as a support for a platinum catalyst applicable in the total oxidation of volatile organic compounds, is reported for the first time. In contrast to commercial pelletized catalysts, high porosity of the membrane allowed for easy accessibility of the platinum active sites to the reactants and the catalytic bed exhibited a low pressure drop. We have shown that the preparation conditions can be tuned in order to obtain catalysts with a desired platinum particle size. In the gas-phase oxidation of ethanol, acetone, and toluene, the catalysts with Pt particle sizes 2.1 nm and 26 nm exhibited a lower catalytic activity than that with a Pt particle size of 12 nm. Catalysts with a Pt particle size of 2.1 nm and 12 nm were prepared by equilibrium adsorption, and the higher catalytic activity of the latter catalyst was ascribed to more reactive adsorbed oxygen species on larger Pt nanoparticles. On the other hand, the catalyst with a Pt particle size of 26 nm was prepared by a solvent evaporation method and contained less active polycrystalline platinum. Last but not least, the catalyst containing only 0.08 wt.% of platinum achieved high conversion (90%) of all the model volatile organic compounds at moderate temperatures (lower than 335 °C), which is important for reducing the costs of the abatement technology.

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Section: Resultsmentioning

confidence: 99%

Platinum Nanoparticles Immobilized on Electrospun Membranes for Catalytic Oxidation of Volatile Organic Compounds

Soukup

Topka²,

Kupčı́k³

et al. 2023

Membranes

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“…[87] Renewable resource-based AC is considered as an effective and attractive support among many ACs. Topka et al [88] utilized AC support, which came from cacao pod husk via ZnCl 2 treatment, for palladium oxidation catalysts. Palladium nanoparticles were added by using Pd acetate impregnation in citric acid.…”

Section: Activated Carbonmentioning

confidence: 99%

Solid‐Supported Catalysts for Organic Functional Group Transformations

et al. 2023

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Design of solid‐supported metal catalysts (SSMCs) has made an increasingly important contribution to heterogeneous catalysis in terms of fundamental understanding and technological applications. For instance, industrial use of supported catalysts for oxidation, reduction, and C−C bond formation reactions is highly prevalent. The reason behind this is that such catalysts are economical, have high thermal stability, dispersion, high exposed surface area, and above all, high reusability (up to multiple subsequent cycles). Such characteristics make supported catalysts ideal for green synthesis. However, unlike homogeneous catalysis, heterogeneous catalysis is widely applied in crude oil refining, the pharmaceutical industry, water purification, natural product synthesis, and environmental catalysis. Carbon‐carbon bond formation reactions are frequently used in the organic synthesis using SSMCs. SSMCs are attractive to synthetic chemists due to their easy recovery and excellent stability compared to unsupported metal catalysts. However, the major drawback of SSMCs is related to metal sintering at elevated temperatures caused by weak interactions between the metal and solid support in SSMCs. This review highlights major advancements in SSMCs. Three commonly reported solid supports for metal catalysts, such metal oxides, carbonaceous materials, and polymeric compounds, are discussed. Moreover, a series of thermo‐ and photocatalyzed reactions, such as hydrogenation, carbon‐carbon bond formation, oxidation reactions and multicomponent reactions and the effect of variable supports towards activity and selectivity are demonstrated.

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“…Although organic supports are easily chemical modified with chelating groups and fabricated into various shapes, the shortcomings [e.g., poor thermal stability (decomposition generally occurs at ~200°C in air condition), low organic solvent‐resistance in high temperature] limit their applications. As a result, inorganic matrices are still widely used as the supports, such as active carbon, TiO 2 , MgO, SiO 2 , and so on 10–11 . Among the inorganic supports, the active carbon supported palladium catalyst (Pd/C) is one of the most effective heterogeneous palladium catalysts under the similar catalysis condition 12–14 .…”

Section: Introductionmentioning

confidence: 99%

“…As a result, inorganic matrices are still widely used as the supports, such as active carbon, TiO 2 , MgO, SiO 2 , and so on. [10][11] Among the inorganic supports, the active carbon supported palladium catalyst (Pd/C) is one of the most effective heterogeneous palladium catalysts under the similar catalysis condition. [12][13][14] The Pd/C catalyst has many attractive physical properties, such as high porosity, larger specific surface area, excellent thermal stability and solvent resistance properties.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of palladium nanoparticles inside chitosan derived N‐doped carbon nanofibers for Heck reaction

Gao

Zhang

Liu

et al. 2021

J of Applied Polymer Sci

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Activated Carbon from Renewable Material as an Efficient Support for Palladium Oxidation Catalysts

Cited by 11 publications

References 25 publications

Platinum Nanoparticles Immobilized on Electrospun Membranes for Catalytic Oxidation of Volatile Organic Compounds

Platinum Nanoparticles Immobilized on Electrospun Membranes for Catalytic Oxidation of Volatile Organic Compounds

Solid‐Supported Catalysts for Organic Functional Group Transformations

Stabilization of palladium nanoparticles inside chitosan derived N‐doped carbon nanofibers for Heck reaction

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