Physicochemical properties of metal-doped activated carbons and relationship with their performance in the removal of SO2 and NO

Gao, Xiang; Liu, Shaojun; Zhang, Yang; Luo, Zhongyang; Cen, Kefa

doi:10.1016/j.jhazmat.2011.01.065

Cited by 96 publications

(97 citation statements)

References 46 publications

(64 reference statements)

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“…High temperature hydrogen treatment slightly increases carbon surface area and micropore volume and has a minimal impact on the carbon pore volume distribution. These slight changes are due to the removal of surface oxygen functionalities that may have twofold impacts: first, widening the pore widths, and second, contributing to the weight loss of samples; thus increasing the weight-normalized surface area is most likely due to carbon catalytic gasification by metallic copper and nickel at 800 °C [46,47]. Unlike other ACFH samples, ACFH-Ni 0 has a considerable (~14%) mesoporosity that is created by pore widening of ACFH during the high temperature hydrogen treatment, due to catalytic gasification of carbon by hydrogen in the presence of zero-valent nickel [48].…”

Section: Porosity Characterizationmentioning

confidence: 99%

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

2012

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Adsorption of sulfur compoundsby porous materials is an effective way to produce cleaner diesel fuel.In this study, adsorption of refractory thiophenic sulfur compounds, i.e., benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in single-solute systems from n-hexane solutions onto metal-impregnated activated carbons was investigated. A hydrogen-treated activated carbon fiber was selectively loaded with Ni, NiO, Cu, Cu 2 O, and CuO species to systematically assess the impact of each metal species on the adsorption of thiophenic compounds (TC). Metal-loaded adsorbents had the same total metal contents and similar microporosities, but contained different types of copper or nickel species. All metal-loaded adsorbents showed enhanced adsorption of tested TC. Cu 2 O-or NiO-loaded adsorbents exhibited the highest uptakes, due to more specific interactions between Cu + or Ni 2+ species and TC molecules. The theoretical monolyer coverage of TC on the exposed Cu + sites was estimated and compared with that calculated from the experimental data. Results suggested catalytic conversion of TC molecules to other compounds on the Cu + sites, followed by adsorption of reaction products onto the carbon surface or multilayer accumulation of TC molecules on the Cu + sites. TC adsorption uptake of the majority of adsorbents followed the order of: 4,6-DMDBT > DBT > BT due to higher intensity of specific and non-specific interactions of larger TC molecules with adsorbents.

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Section: Porosity Characterizationmentioning

confidence: 99%

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

2012

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“…This is also shown in SEM image report for CeACF, with excess loading at the edges of fiber. (Chong et al, 20 07;Gao et al, 2011).…”

Section: Xrd Analysismentioning

confidence: 99%

Selective catalytic reduction of nitric oxide over cerium-doped activated carbons

Athappan

Sattler

Sethupathi

2015

Journal of Environmental Chemical Engineering

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“…In addition, diffraction peaks for SiO 2 at 2h = 26.6°were detected in all samples and were derived from the carbon char. The XRD pattern from AC-Co2 contained three peaks at 2h = 44.3°, 51.5°and 75.9°(JCPDS 15-0806), which were ascribed to metallic cobalt particles (Chu et al 2011; (Gao et al 2011;Guo et al 2009). XPS analysis was conducted for further clarifying the catalytically active species of the metal additives on the modified activated carbons.…”

Section: Metal Phasesmentioning

confidence: 99%

“…In addition, previous studies have found that the desulfurization activities of activated carbon could be improved by modification with transition metals, such as Co, Ni, Cu and V (Gao et al 2011;Guo et al 2012;Tseng et al 2003). Several procedures can be used practically to prepare activated carbon support catalysts.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties and desulfurization activities of metal oxide/biomass-based activated carbons prepared by blending method

Fan

Jiang

et al. 2014

Adsorption

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Column activated carbons were prepared from walnut shell chars and transition metal oxide powders (i.e. Co 2 O 3 , Ni 2 O 3 , CuO and V 2 O 5 ) with blending method. Samples were characterized by N 2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. The texture properties of all modified activated carbons with metal oxides dosage of \5 wt% did not change evidently. The basic functionalities of these activated carbons increased relative to blank carbon. Moreover, metal species with different oxidation states coexisted on the modified activated carbons. The optimal dosage of all metal oxides was 2 wt%. The sulfur capacities of these modified activated carbons were 7.7-46.0 % higher than that of blank activated carbon and the highest occurred for V 2 O 5 modified activated carbon. The improved desulfurization performance was mainly attributed to the higher catalytic activity of the active metal oxides formed in the presence of O 2 during the desulfurization process.

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Physicochemical properties of metal-doped activated carbons and relationship with their performance in the removal of SO2 and NO

Cited by 96 publications

References 46 publications

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

Selective catalytic reduction of nitric oxide over cerium-doped activated carbons

Physicochemical properties and desulfurization activities of metal oxide/biomass-based activated carbons prepared by blending method

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