Hydrogen sulfide removal by iron containing activated carbon

Nakamura, Takeo; Tanada, Seiki; Kawasaki, Naohito; Hara, Tsukasa; Fujisawa, Junko; Shibata, Kanako

doi:10.1080/02772249609358343

Cited by 9 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Iron oxide (Fe 2 O 3 ) increased the rate of H 2 S oxidation, and potassium carbonate (K 2 CO 3 ) was reported to have been used effectively for this purpose (Henning and Schäfer, 1993). Impregnation of activated carbon with iron (III) chloride (FeCl 3 ) also improved the adsorptive capacity for H 2 S (Nakamura et al, 1996;Sakanishi et al, 2005). Mikhalovsky and Zaitsev (1997) examined the effects of metal loaded activated carbons.…”

Section: Introductionmentioning

confidence: 98%

Direct oxidation of hydrogen sulphide to sulphur using impregnated activated carbon catalysts

Dalai

Cundall

2008

Can J Chem Eng

View full text Add to dashboard Cite

Low concentrations of H 2 S were directly oxidized to sulphur and small quantities of SO 2 , over seven different activated carbons with or without impregnation. The effectiveness of virgin activated carbon was tested at 175 • C, 700 kPa, and O 2 /H 2 S ratio with 5% greater than stoichiometry. The conversion of H 2 S was 99.9 mol% with SO 2 production of 3-6%, for 360 min runtime for Fisher coconut shell activated carbon and 648 min for Envirotrol bituminous (EB) activated carbon. Then the activated carbons became deactivated due to deposition of sulphur on the surface. Under these conditions mesoporous activated carbons such as EB and Hydrodarco had the longest breakthrough time. The addition of 5.5 wt% ammonium iodide, potassium iodide and potassium carbonate individually to EB decreased the production of SO 2 while having minimal effect on the overall H 2 S conversion. The addition of 5.5 wt% NH 4 I decreased the average SO 2 production from 2.5% to 0.9%. The activation energy for the H 2 S oxidation on the 5.5 wt% NH 4 I on EB activated carbon was determined to be 40 kJ/mol. De faibles concentrations de H 2 S ontété directement oxydées en soufre et en petites quantités de SO 2 , sur sept charbons actifs différents avec ou sans imprégnation. L'efficacité du charbon actif vierge aété testéeà 175 • C, 700 kPa et un rapport O 2 /H 2 S de 5% plus grand que la stoechiométrie. La conversion du H 2 S est de 99,9% en mole avec une production de SO 2 de 3-6%, pour des durées d'essai de 360 min pour le charbon actif sur une coquille de noix de coco de Fisher et de 648 min pour le charbon actif bituminé Envirotrol (EB). Par la suite, les charbons actifs se désactivent en raison du dépôt de soufre sur la surface. Dans ces conditions, les charbons actifs mésoporeux tels l'EB et l'Hydrodarco ont les plus longs temps de rupture. L'ajout aux EB, de façon individuelle, de 5,5% en masse d'iodure d'ammonium, d'iodure de potassium et de carbonate de potassium diminue la production de SO 2 tout en ayant un effet minimal sur la conversion globale de H 2 S. L'ajout de 5,5% en masse de NH 4 I diminue la production moyenne de SO 2 de 2,5à 0,9%. On a déterminé que l'énergie d'activation pour l'oxydation de H 2 S sur le NH 4 Ià 5,5% en masse sur le charbon actif sur EBétait de 40 kJ/mol.

show abstract

Section: Introductionmentioning

confidence: 98%

Direct oxidation of hydrogen sulphide to sulphur using impregnated activated carbon catalysts

Dalai

Cundall

2008

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Nakamura et al [21] reported that iron(III) chloride impregnated AC has a high selectivity for H 2 S removal. Chiang et al [22] used four alkaline materials (such as NaOH, Na 2 CO 3 , KOH and K 2 CO 3 ) to impregnate AC, and evaluated their performance for H 2 S adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, caustic or acidic impregnated activated carbon (IAC) samples have been employed efficiently to adsorb H 2 S from waste-gas stream [17][18][19][20][21][22]. Nakamura et al [21] reported that iron(III) chloride impregnated AC has a high selectivity for H 2 S removal.…”

Section: Introductionmentioning

confidence: 99%

Effect of moisture on H2S adsorption by copper impregnated activated carbon

Huang

Chen

Chu

2006

Journal of Hazardous Materials

123

View full text Add to dashboard Cite

“…(5)) [24]. Moreover, waste biocover soil was rich in inorganic impurities catalyst (silica, alumina, iron oxide, calcium oxide and magnesia), which could catalyze H 2 S oxidation and convert it to elemental sulfur in the presence of oxygen [27,30,31]. Meanwhile, elemental sulfur would be oxidized to sulfate at a slow rate (Eq.…”

Section: Effect Of Oxygen Concentration On Adsorption Of H 2 Smentioning

confidence: 97%