Oxidation of H2S on activated carbon KAU and influence of the surface state

Brazhnyk, D. V.; Zaitsev, Yuri P.; Bacherikova, I. V.; Zazhigalov, V. A.; Stoch, J.; Kowal, Andrzej

doi:10.1016/j.apcatb.2005.12.028

Cited by 51 publications

(28 citation statements)

References 47 publications

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“…This result is not expected since H 2 S is not a typical oxidizing gas (rather an amphoteric substance). In fact, H 2 S can undergo oxidation in air and form elemental sulphur as it was shown over CNT and activated carbon surfaces [14][15][16][17][18] explaining the observed decrease of channel resistance, i.e. the presence of oxidizing moieties on the nanotubes.…”

Section: Resultsmentioning

confidence: 89%

Inkjet printed resistive and chemical‐FET carbon nanotube gas sensors

Mäklin

Mustonen

Halonen

et al. 2008

Physica Status Solidi (b)

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Aqueous solutions of carboxyl functionalized single‐wall carbon nanotube (SWCNT) films are deposited on silicon chips by the inkjet printing technique. By varying the film thickness it is possible to obtain low‐ or high density networks of SWCNTs, having either nonlinear or linear current‐voltage characteristics, respectively. The electrical transport in the low‐density films is gate‐controllable and utilized as chemical field‐effect transistor sensors; whereas the high‐density SWCNT networks of nearly Ohmic behaviour are used as conventional resistive gas sensors. The response of both types of sensors is studied for hydrogen sulfide (H2S) analyte. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 89%

Inkjet printed resistive and chemical‐FET carbon nanotube gas sensors

Mäklin

Mustonen

Halonen

et al. 2008

Physica Status Solidi (b)

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“…The second O 1s peaks (BE = 533.2-533.8 eV) correspond to C-O type oxygen in C-OH and COOR groups. According to published data (Brazhnyk et al 2007), the O 1s peaks with BE = 534.10-535.48 eV are associated with strongly adsorbed water molecules. The relative content of different oxygen species shows that silylation of activated carbon reduces the relative content of O 1s peaks corresponding to C-O type oxygen in C-OH and COOR groups from 72.55% to 34.13%.…”

Section: Xpsmentioning

confidence: 92%

“…These distinct energies allow the identification of different species. According to the literature (Brazhnyk et al 2007), the C 1s spectra were well fitted with five peaks (Table 4) assigned to carbon atoms bound with carbon and/or hydrogen atoms (BE = 284.76-284.80 eV), to carbon atoms bonded with oxygen atoms by one, two and three bonds (BE = 286.16-286.36, 287.57-287.67 and 289.04-289.09 eV, respectively) and to the π -π * peak (BE = 290.99-291.15 eV). The data in Table 4 indicate that the silylation of activated carbon had little influence on the electronic state of carbon atoms and C 1s .…”

Section: Xpsmentioning

confidence: 99%

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

et al. 2009

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A commercial activated carbon was functionally modified by silylation with 3-aminopropyltriethoxysilane (APTES). The silylation led to the fixation of weakly basic functional groups, -NH 2 , on the surface as indicated by pH titration, Boehm titration, N 2 − BET analysis and X-ray photoelectron spectroscopic (XPS) analysis. Despite reducing the specific BET area and the pore volume, silylation improved the H 2 S removal capacity so that APTES modified activated carbon (APTES-AC) was 3.55 times more effective than the original activated carbon. XPS results indicate that H 2 S removal may be associated with the amino (-NH 2 ) group and the presence of sulfur in the four oxidation states S 2− , S 0 , S 4+ and S 6+ . The effects of moisture, oxygen content and temperature on the performance of APTES-AC for H 2 S removal were investigated. The presence of moisture in the gas stream was found to have an adverse effect on the H 2 S removal, whilst the presence of oxygen favored the removal of H 2 S by APTES-AC. The higher removal capacity of APTES-AC relative to the original activated carbon indicates that APTES-AC is a potential candidate for the removal of H 2 S from gas streams. The H 2 S removal efficiency of APTES-AC was proved be superior to that of Na 2 CO 3 -impregnated AC by the pilot-scale test of purification H 2 S containing industrial waste gas, yellow phosphorus off-gas.

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“…Boehm titration is used to determine the functionalities involving acid functional groups (primarily CHO and COOH) and basic functional groups (primarily pyrone), because many oxygen functional groups exist in tremendously varied quantities on the surface of different carbons. The determination and quantification of carbon surface functional groups is essential in interpreting the reaction between H 2 S and carbon surface [18,[21][22][23]. In our previous experiments, it was found that capabilities of H 2 S uptake increases with the density of basic functionalities on AC surfaces [24].…”

Section: Introductionmentioning

confidence: 98%

Factors affecting activated carbon-based catalysts for selective hydrogen sulfide oxidation

Monnell

Maryanne

et al. 2008

Main Group Chemistry

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The primary product of coal gasification processes is synthesis gas (syngas), a mixture of CO, H 2 , CO 2 , H 2 O and a number of minor components. Among the most significant minor components in syngas is hydrogen sulfide (H 2 S). In addition to its adverse environmental impact, H 2 S poisons the catalysts and hydrogen purification membranes, and causes severe corrosion in gas turbines. Technologies that can remove H 2 S from syngas and related process streams are, therefore, of considerable practical interest. To meet this need, we work towards understanding the mechanism by which prospective H 2 S catalysts perform in simulated fuel gas conditions. Specifically, we show that for low-temperature gas clean-up (*1408C) using activated carbon fibers and water plays a significant role in H 2 S binding and helps to prolong the lifetime of the material. Basic surface functional groups were found to be imperative for significant conversion of H 2 S to daughter compounds, whereas metal oxides (La and Ce) did little to enhance this catalysis. We show that although thermal regeneration of the material is possible, the regenerated material has a substantially lower catalytic and sorption capacity.

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Oxidation of H2S on activated carbon KAU and influence of the surface state

Cited by 51 publications

References 47 publications

Inkjet printed resistive and chemical‐FET carbon nanotube gas sensors

Inkjet printed resistive and chemical‐FET carbon nanotube gas sensors

Enhanced removal of hydrogen sulfide from a gas stream by 3-aminopropyltriethoxysilane-surface-functionalized activated carbon

Factors affecting activated carbon-based catalysts for selective hydrogen sulfide oxidation

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