Catalytic activity, stability and structure of multi-walled carbon nanotubes in the wet air oxidation of phenol

Yang, Shaoxia; Li, Xiang; Zhu, Wanpeng; Wang, Jianbing; Descorme, C.

doi:10.1016/j.carbon.2007.12.006

Cited by 128 publications

(73 citation statements)

References 36 publications

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“…Besides serving as a support, CNTs alone can be used as catalysts for some specific reactions, including methane and NO x decomposition [3,4], oxidative dehydrogenization of aromatic hydrocarbons and alkanes [5,6,7,8,9], oxidation of aniline [10], p-toluidine [11], and benzyl alcohol [12], catalytic wet air oxidation of phenol [13,14] and pcoumaric acid [15,16], aerobic oxidation of cyclohexane [17,18], ozonation of oxalic acid [19,20], selective oxidation of H 2 S [21], and heterogeneous hydroxylation of organics [22]. Nitrogen-doped CNTs were used as basic catalyst in Knoevenagel condensation [23] and CO oxidation [24] reactions.…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Voitko

Toth

Demianenko

et al. 2015

Journal of Colloid and Interface Science

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The catalytic performance of multi-walled carbon nanotubes (MWCNTs) with different surface chemistry was studied in the decomposition reaction of H 2 O 2 at various values of pH and temperature. A comparative analysis of experimental and quantum chemical calculation results is given. It has been shown that both the lowest calculated activation energy (~18.9 kJ/mol) and the highest rate cons tant correspond to the N-containing CNT. The calculated chemisorption energy values correlate with the operation stability of MWCNTs. Based on the proposed quantum chemical model it was found that the catalytic activity of carbon materials in electron tran sfer reactions is controlled by their electron donor capability.

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Section: Introductionmentioning

confidence: 99%

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Voitko

Toth

Demianenko

et al. 2015

Journal of Colloid and Interface Science

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“…Some other publications [71,72,80] have claimed that the carboxylic acid groups attached to the surface of CNTs promote their catalytic activity for the oxidation of phenol by the CWAO process. To clarify the controversy in the literature regarding the active sites of CNTs (i.e., sites of basic or acidic nature) required to achieve the best performance in CWAO, CNTs samples obtained by the oxidation of CNTs with HNO 3 , followed by thermal treatments for the selective removal of O-containing groups used in ref.…”

Section: Environmental Catalytic Applicationsmentioning

confidence: 99%

“…Although this is well accepted in literature for COZ, in the case of CWAO there is a controversy regarding the active sites on carbon nanotubes (i.e., sites of basic or acidic nature) required to achieve the best performance. The catalytic activity of nanocarbons successfully functionalized with different heteroatoms has been investigated in CWAO [31,38,52,56,[70][71][72][73] and in COZ [26,51,56,[67][68][69][74][75][76][77][78] by several authors. O-, N-and S-doped CNTs have been studied as catalysts in both processes.…”

Section: Environmental Catalytic Applicationsmentioning

confidence: 99%

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

Rocha

Soares

Figueiredo

et al. 2016

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Abstract:The application of carbon nanotubes (CNTs) as metal-free catalysts is a novel approach for heterogeneous liquid phase catalytic systems. Textural and chemical modifications by liquid/gas phase or mechanical treatments, as well as solid state reactions, were successfully applied to obtain carbon nanotubes with different surface functionalities. Oxygen, nitrogen, and sulfur are the most common heteroatoms introduced on the carbon surface. This short-review highlights different routes used to develop metal-free carbon nanotube catalysts with enhanced properties for Advanced Oxidation Processes.

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“…For example, the CWAO of organic compounds (such as nitrogen-containing organic compounds, carboxylic acids, phenols, and industrial wastewaters) is operated at the milder operating conditions than in the WAO in the absence of catalysts. The development of highly active and stable catalysts has received great attention [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence of the structure of TiO2, CeO2, and CeO2-TiO2 supports on the activity of Ru catalysts in the catalytic wet air oxidation of acetic acid

2011

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Ru catalysts, supported on TiO 2 , CeO 2 , and CeO 2 -TiO 2 , were prepared by the impregnation method. The effect of the structure of the supports on the activity of Ru catalysts was investigated in the catalytic wet air oxidation (CWAO) of acetic acid under 230°C and 5 MPa in a batch reactor. Physical properties including the surface area, crystalline phase, and surface components of the Ru catalysts were characterized by N 2 adsorption, X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The CeO 2 -based Ru catalysts had good activity, and the prepared RuO 2 /CeO 2 catalyst showed markedly higher activity than the RuO 2 /CeO 2 -TiO 2 catalyst. The surface structure, the high amount of chemisorbed oxygen on the catalyst surface, and the suitable pH pzc value of the supports played an important role in the activity of the Ru catalysts in CWAO of acetic acid.

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Catalytic activity, stability and structure of multi-walled carbon nanotubes in the wet air oxidation of phenol

Cited by 128 publications

References 36 publications

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

Influence of the structure of TiO2, CeO2, and CeO2-TiO2 supports on the activity of Ru catalysts in the catalytic wet air oxidation of acetic acid

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