Effect of doping the nitrogen into carbon nanotubes on the activity of NiO catalysts for the oxidation removal of toluene

Jiang, Shujuan; Handberg, Eric; Liu, Fen; Liao, Yuting; Wang, Huayu; Li, Zhe; Song, Shaoqing

doi:10.1016/j.apcatb.2014.06.026

Cited by 44 publications

(23 citation statements)

References 61 publications

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“…As indicated in Table 6, activated carbons prepared by different methods from various raw materials have been used as catalyst support for total oxidation of toluene at temperatures below of 300°C but have shown no significant toluene removal efficiency. Catalysts supported on activated carbons derived from agricultural solid wastes show a higher activity than those supported on carbon nano tubes [16,67]. Furthermore, supported catalysts on activated carbons prepared by physical activation are more efficient towards toluene oxidation than those supported on activated carbons prepared by chemical activation.…”

Section: Comparison Of the Catalyst Performance With Other Reported Cmentioning

confidence: 92%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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Dispersed copper oxide nano-catalysts supported on almond shell-based activated carbon were prepared for catalytic oxidation of toluene in air. The response surface methodology was used to express the catalyst removal efficiency in terms of catalyst metal loading and calcination temperature. Catalyst activity increased with both increasing calcination temperature and metal loading. Calcination temperature had a significant effect on the catalyst activity only at high metal loadings. Two different catalyst preparation methods were employed to investigate the effect of impregnation technique on the deposition-precipitation method. Well-dispersed nano catalysts with higher efficiency towards oxidation of toluene were prepared by the heterogeneous depositionprecipitation (HDP) as compared with the combined impregnation and deposition-precipitation method. The support and catalyst properties were determined by X-ray diffraction, Transmission electron microscopy, fieldemission scanning electron microscope, Boehm test, Brunauer-Emmett-Teller surface area measurements, and energy-dispersive X-ray spectroscopy. Characterization analyses and reaction experiments indicated the antonym effect of impregnation method on the deposition-precipitation method for catalyst preparation. Two types of crystallite (large and small) were formed on the support as a consequence of using the combined catalyst preparation method. Kinetic models were proposed for oxidation of toluene using copper oxide catalysts prepared by the HDP method. The kinetic study indicated that an Eley-Rideal mechanism could adequately describe the kinetic behavior of toluene oxidation.List of symbols C 0 Inlet feed concentration (ppm) C e Exit gas concentration (ppm) D Mean crystallite diameter (nm) K Dimensionless shape factor = 0.9 k X-ray wavelength BLine broadening at half maximum intensity H Bragg angle X T Steady state conversion of the toluene W Weight of catalyst loaded in reactor (g) M Inlet molar flow rate of toluene (mol/s) r Rate of toluene oxidation (mol/g s) Error Objective function of GA methodology for estimating kinetic constants was the absolute error E Activation energy (kJ/mol) DH Adsorption enthalpy (kJ/mol) R Gas constant (J/mol K) R 2

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Section: Comparison Of the Catalyst Performance With Other Reported Cmentioning

confidence: 92%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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“…One of the main challenges encountered when CNTs are used as the support material for nanoparticle synthesis is the hydrophobicity of their surface. In this regard, surface functionalization of CNTs for the generation of covalent bonds and further attachment of oxide nanoparticles seems to be of great significance [17][18][19]. The functionalization of CNTs is commonly performed using the chemical oxidation process introducing functional groups such as -COOH, C-O, C=O, and -OH on the surface of CNTs; such groups act as active surface sites for metal attachment [20,21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

et al. 2017

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In this study, the efficiency of nickel oxide/carbon nanotube (NiO/CNT) nanocomposite to remove Pb 2? from aqueous solution is investigated. NiO/CNT nanocomposite was prepared using the direct coprecipitation method in an aqueous media in the presence of CNTs. Samples were characterized using simultaneous thermal analysis (STA), X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), and BrunauerEmmett-Teller (BET). To optimize the adsorption of Pb 2?ions on NiO/CNT nanocomposite, the effects of different parameters including pH, contact time, initial concentration of Pb 2? , and adsorbent mass-were also investigated. The optimum Pb 2? removal efficiency on NiO/CNT nanocomposite is achieved under experimental conditions of pH 7, contact time of 10 min, initial Pb 2? concentration of 20 ppm, and adsorbent mass of 0.1 g. The experimental data showed that the Pb 2? ions adsorption of NiO/CNT nanocomposite was through a Freundlich isotherm model rather than a Langmuir model. The kinetic data of adsorption of Pb 2? ions on the adsorbent was perfectly shown by a pseudo-second-order equation, to indicate their chemical adsorption. Thermodynamic parameters such as DG°, DH°, and DS°were also measured; the obtained values showed that the adsorption was basically spontaneous and endothermic.

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“…Transition metal oxides (e.g., Fe 2 O 3 (Nogueira et al, 2011), Cr 2 O 3 (Sinha and Suzuki, 2005), CuO (Delimaris and Ioannides, 2009), NiO (Jiang et al, 2014), Co 3 O 4 (Bai et al, 2013) and MnO x (Rezaei and Soltan, 2012)) with fast electron transfer and variable valences, and their composites have been alternatives to precious metals, for their merits of low cost, high resistance to sulfur and chlorine, and good reducibility. But they are also easy to sintering during high-temperature calcination, which is required to activate and stabilize the catalysts in most cases (Zheng et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity

Liang

Liu

et al. 2016

Applied Clay Science

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Effect of doping the nitrogen into carbon nanotubes on the activity of NiO catalysts for the oxidation removal of toluene

Cited by 44 publications

References 61 publications

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity

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