Removal of sulfur compounds and siloxanes by physical and chemical sorption

Chul u. Bak, Chan Jong Lim, Jong Gyu Lee, Young Deuk Kim, Woo-Seung Kim

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

The removal of sulfur compounds and siloxanes, which are major impurities in the biogas produced from the anaerobic digestion of sewage sludge, was studied using a bench-scale adsorptive gas purification experimental setup. The main impurities are hydrogen sulfide (H2S), carbonyl sulfide (COS), carbon disulfide (CS2), octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5). The commercially available adsorbents iron oxide (IO), iron oxide hydroxides (IH, IHS), activated carbon (AC), impregnated activated carbon (IAC), silica gels (A2 and NS10) and molecular sieves (5A and 13X) were first extensively characterized using scanning electron microscopy (SEM), X-ray fluorescence (XRF), and BET surface area measurements. IHS, comprising mainly 42% iron oxide hydroxide, 11% silica gel, and 10% activated carbon, exhibited the best adsorption capacities for H2S (539 mg/g) and COS (32 mg/g) among the adsorbents studied, as well as relatively good adsorption capacities for siloxanes D4 and D5. AC and IAC showed the greatest CS2 removal efficiency. A2 demonstrated extremely high adsorption capacities for siloxanes D4 and D5, namely 1055 and 1968 mg/g, respectively.

Original languageEnglish
Pages (from-to)542-549
Number of pages8
JournalSeparation and Purification Technology
Volume209
DOIs
StatePublished - 2019 Jan 31

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Siloxanes
Sulfur Compounds
Sulfur compounds
Activated carbon
Sorption
Iron oxides
Silica Gel
Silica gel
Adsorption
Adsorbents
Hydroxides
Impurities
Gas fuel purification
Carbon Disulfide
Carbon disulfide
Hydrogen Sulfide
Anaerobic digestion
Biofuels
Biogas
Molecular sieves

Keywords

  • Biogas purification
  • Chemisorption
  • Physisorption
  • Siloxanes
  • Sulfur compounds

Cite this

Bak, Chul u. ; Lim, Chan Jong ; Lee, Jong Gyu ; Kim, Young Deuk ; Kim, Woo-Seung. / Removal of sulfur compounds and siloxanes by physical and chemical sorption. In: Separation and Purification Technology. 2019 ; Vol. 209. pp. 542-549.
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abstract = "The removal of sulfur compounds and siloxanes, which are major impurities in the biogas produced from the anaerobic digestion of sewage sludge, was studied using a bench-scale adsorptive gas purification experimental setup. The main impurities are hydrogen sulfide (H2S), carbonyl sulfide (COS), carbon disulfide (CS2), octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5). The commercially available adsorbents iron oxide (IO), iron oxide hydroxides (IH, IHS), activated carbon (AC), impregnated activated carbon (IAC), silica gels (A2 and NS10) and molecular sieves (5A and 13X) were first extensively characterized using scanning electron microscopy (SEM), X-ray fluorescence (XRF), and BET surface area measurements. IHS, comprising mainly 42{\%} iron oxide hydroxide, 11{\%} silica gel, and 10{\%} activated carbon, exhibited the best adsorption capacities for H2S (539 mg/g) and COS (32 mg/g) among the adsorbents studied, as well as relatively good adsorption capacities for siloxanes D4 and D5. AC and IAC showed the greatest CS2 removal efficiency. A2 demonstrated extremely high adsorption capacities for siloxanes D4 and D5, namely 1055 and 1968 mg/g, respectively.",
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Removal of sulfur compounds and siloxanes by physical and chemical sorption. / Bak, Chul u.; Lim, Chan Jong; Lee, Jong Gyu; Kim, Young Deuk; Kim, Woo-Seung.

In: Separation and Purification Technology, Vol. 209, 31.01.2019, p. 542-549.

Research output: Contribution to journalArticleResearchpeer-review

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