Characterization of surface oxygen complexes on carbon nanofibers by TPD, XPS and FT-IR

Zhou, Jinghong; Sui, Zhi‐Jun; Zhu, Junwu; Li, Ping; Chen, De; Dai, Yang; Wang, Yuan

doi:10.1016/j.carbon.2006.11.019

Cited by 956 publications

(490 citation statements)

References 38 publications

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“…The decomposition of O-containing groups occurs at a given temperature and is accompanied by a release of CO or CO 2 . Although the assignment of the different peaks during TPD analysis is still discussed in the literature, global trends have emerged in previous studies [40,45]. The correlations are given in (Table S2).…”

Section: Characterization Of the Materialsmentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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A B S T R A C TPyrolysis chars from wastes were investigated as sorbents for H 2 S removal from syngas. The H 2 S removal tests were performed at ambient temperature in various dry gas matrices (N 2 , Air, Syngas) to study the effect of the gas composition on the adsorption efficiency. Two chars were produced by the pyrolysis of: used wood pallets (UWP), and a 50/50% mixture of food waste (FW) and coagulation-flocculation sludge (CFS). The chars were functionalized by low-cost processes without chemicals: gas phase oxygenation and steam activation. Activated chars were the most efficient materials due to their large specific surface area, alkaline pH, basic O-containing groups and structural defects in graphene-like sheets. Raman analysis evidenced that inherent mineral species (especially Ca and Fe) increased the H 2 S removal efficiency by promoting the formation of metal sulfide and metal sulphate species at the char surface. Mesopores lower than 70 Å were revealed to be important adsorption sites. Under dry Syngas matrix, the chars remained efficient and selective toward H 2 S removal despite the presence of CO 2 , while O 2 in the Air matrix decreased their removal capacity due to the formation of sulfur acid species. The most efficient material was the steam activated char from FW/CFS, with a removal capacity of 65 mg H2S .g −1 under dry syngas. This char was proved to be completely regenerated with a thermal treatment under N 2 at 750°C. This study demonstrated that activated chars from food waste and sludge could be used as eco-friendly, affordable, and selective materials for syngas desulfurization even under dry atmosphere.

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Section: Characterization Of the Materialsmentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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“…Before discussing a recently published set of data [5,14,40,41,47,48,[53][54][55][56][57] of surface treated nanocarbon materials, depicted in Fig. 7 (and in Table 1 in the Supplementary Information), several problems associated with the published peak-synthesis procedure and the following assignments have to be emphasized.…”

Section: Chemical Structurementioning

confidence: 99%

Surface modification of graphene and graphite by nitrogen plasma: Determination of chemical state alterations and assignments by quantitative X-ray photoelectron spectroscopy

Bertóti

Mohai

László

2015

Carbon

165

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Multilayer graphene (MLGR) and its bulk analog, highly oriented pyrolytic graphite (HOPG), were treated by radio frequency activated low pressure N 2 gas plasma (at negative bias 0 - pyrrole-and triazine-type at 399.7 eV and N substituting C in graphite-like network at 400.9 eV) were determined from high-resolution N1s spectral region for all samples. Pyridine and pyrrole-triazine components increase preferentially with increasing bias. Alterations of the C1s and O1s spectra are discussed in a critical approach. The amount of reacted carbon was consistent with that required for the three different nitrogen and oxygen states, thus validating the proposed assignments.

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“…The models used to decompose the C1s, S2p and P2p peaks were those proposed by Desimoni et al [36], Terzyk [37] and Puziy et al [38], respectively. The O1s region was decomposed, as suggested by Zhou et al [39]; in addition, two components corresponding to P−O and P═O contributions were used.…”

Section: Xpsmentioning

confidence: 99%

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Seredych

Wu²,

Brender

et al. 2012

Fuel

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Adsorptive removal of dibenzothiophene (DBT) and 4, from model diesel fuel with 20 ppmw total concentration of sulfur was investigated on polymerderived carbons with incorporated heteroatoms of oxygen, sulfur and phosphorus. The materials before and after exposure to model diesel fuel were characterized using adsorption of nitrogen, thermal analysis, potentiometric titration, XPS and elemental analysis. The selectivities for DBT and DMDBT adsorption were calculated with reference to naphthalene. The results indicated that the presence of phosphorus, especially in the form of pyrophosphates and P 2 O 5 , increases the capacity and selectivity for removal of dibenzothiophenes. It also affects the adsorption mechanism. Phosphorus suppresses oxidation reactions of DBT and DMDBT. Owing to a possible location of bulky phosphorus groups in pore with sizes between 10-30 Å thiophenic molecules are strongly adsorbed there via dispersive forces. Acidic environment also enhances adsorption via acid-base interactions. Physical adsorption mechanism and stability of surface make these carbons attractive candidates for thermal regeneration.

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Characterization of surface oxygen complexes on carbon nanofibers by TPD, XPS and FT-IR

Cited by 956 publications

References 38 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

Surface modification of graphene and graphite by nitrogen plasma: Determination of chemical state alterations and assignments by quantitative X-ray photoelectron spectroscopy

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

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