Removal of dimethyl sulfide and t-butylmercaptan from city gas by adsorption on zeolites

Wakita, Hidenobu; Tachibana, Yuta; Hosaka, Masato

doi:10.1016/s1387-1811(01)00299-2

Cited by 78 publications

(73 citation statements)

References 20 publications

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“…Presumably the slight amount of butene, most probably isobutene, was formed through the dissociative adsorption of TBT with the cleavage of the C _ S bond over H-FAU-2.8 at 150 . The formation of hydrogen sulfide and isobutene from TBT above 60º C has also been detected in the TPD of TBT adsorbed on H-beta zeolite 28) . F i g u re 4 s h ow s t h e in-situ F T I R s p e c t r a o f H-FAU-2.8 before (a) and after (b) the adsorption of TBT at 25 , and the subtraction spectrum (c) of (b)-(a).…”

Section: Reaction Scheme Of Tbt Decomposition Over H-y Zeolitementioning

confidence: 82%

Decomposition of <i>t</i>-Butanethiol into Hydrogen Sulfide without Hydrogen Addition over H-Y and H-beta Zeolites

昂

光男

慎太郎

et al. 2015

J. Jpn. Petrol. Inst.

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Catalytic direct decomposition of t-butanethiol (TBT) into hydrogen sulfide over zeolites without hydrogen addition was examined as a new desulfurization process for fuel cell systems. TBT is a widely used odorant in pipeline natural gas, and was easily decomposed into hydrogen sulfide and isobutene over H-Y and H-beta at low temperatures of 25-150 . However, catalyst deactivation of H-beta was observed at 60 and oligomerized products of isobutene were observed on the catalyst surface after long reaction times. The deactivation rate of TBT decomposition over H-beta increased with higher acid amounts of H-beta. The amount of oligomerized products deposited on the catalyst increased with lower TBT conversion in the initial stage of reaction. The deposition of oligomerized products and catalyst deactivation decreased after several hours. The amount of the oligomerized products deposited on the catalyst reached approximately 6 wt% after 8 h and remained constant after 125 h over H-beta (Si/Al 92.5) at 150 . The initial TBT conversion was constant during 125 h.

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Section: Reaction Scheme Of Tbt Decomposition Over H-y Zeolitementioning

confidence: 82%

Decomposition of <i>t</i>-Butanethiol into Hydrogen Sulfide without Hydrogen Addition over H-Y and H-beta Zeolites

昂

光男

慎太郎

et al. 2015

J. Jpn. Petrol. Inst.

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“…The DMS in the regenerated solution can be degradable by some microorganism (Microbacterium sp., Thiobacillus novellus, or Pseudomonas sp.) [12,13].…”

Section: Recycling Of Amine-modified Bcmentioning

confidence: 99%

“…Wang et al [11] used bamboo charcoal of Dendrocalamus to remove DMS from aqueous solution. Wakita et al [12] have studied the removal of DMS and t-butylmercaptan (TBM) by using of some zeolites and concluded that the main adsorption site on Na-Y was presumably Na + . Cui and Turn [13] used iron chloride-impregnated activated carbon to remove DMS and they confirmed that the addition of FeCl3 created some new active sites and these new active sites likely had stronger affinity with DMS molecule.…”

Section: Introductionmentioning

confidence: 99%

Removal of Dimethyl Sulfide from Aqueous Solution Using Cost-Effective Modified Chicken Manure Biochar Produced from Slow Pyrolysis

Nguyen

Lee

2015

Sustainability

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This study investigated the characteristics of using a cost-effective, amine-modified biochar (BC) derived from chicken manure for removing dimethyl sulfide (DMS) from an aqueous solution. The amine-modified BC showed much higher adsorption of DMS compared to commercial activated carbons under varying conditions of contact time, initial concentration, and adsorbent dosage. The DMS removal efficiency increased as the adsorbent dosage was increased from 0.01 to 0.25 g and reached 92.4% even at the relatively low adsorbent dose of 0.015 g. The DMS adsorption capacity of the amine-modified BC (mg/g) increased with increasing DMS concentration, while the incremental rate of the removal efficiency decreased. The adsorption process was well explained by a pseudo-second-order kinetics model. The adsorption of DMS is more appropriately described by the Freundlich isotherm (R 2 = 0.989) than by the Langmuir isotherm (R 2 = 0.942). The DMS removal efficiency was only reduced by 23.4% even after 10 recovery cycles. The surface area of the amine-modified BC was much higher (9.4 ± 1.2 times) than that of the unmodified BC. The amine-modified BC with a high surface area of 334.6 m 2 /g can be utilized as a cheap and effective alternative adsorbent to commercial activated carbon for DMS removal.

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“…DMTS is negligibly removed by conventional treatment processes due to their low molecular weights. Various methods, including coagulation / fl occulation, adsorption, biosorption, advanced oxidation and ozonation, have been employed for the treatment of T&O from water (Cook et al, 2001;Wakita et al, 2001;Park et al, 2007;Muthuraman et al, 2011;Zhang et al, 2011). Among various treatment methods, adsorption is more effective than other techniques because of its costeffective, simplicity of design, and ease of operation.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of dimethyl trisulfide from aqueous solution on a low-cost adsorbent: thermally activated pinecone

Shang

Fan

2014

Chin. J. Ocean. Limnol.

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Thermally activated pinecone (TAP) was used for the adsorption of dimethyl trisulfi de (DMTS) from aqueous solutions, which was proved to be the main odorous in algae-caused black bloom. The effects of adsorbent dosage, adsorbate concentration and contact time on DMTS biosorption were studied. The TAP produced at 600°C exhibited a relatively high surface area (519.69 m 2 /g) and excellent adsorption capacity. The results show that the adsorption of DMTS was initially fast and that the equilibrium time was 6 h. Higher initial DMTS concentrations led to lower removal percentages but higher adsorption capacity. The removal percentage of DMTS increased and the adsorption capacity of TAP decreased with an increase in adsorbent dosage. The adsorption process conforms well to a pseudo-second-order kinetics model. The adsorption of DMTS is more appropriately described by the Freundlich isotherm ( R 2 =0.996 1) than by the Langmuir isotherm ( R 2 =0.916 9). The results demonstrate that TAP could be an attractive low-cost adsorbent for removing DMTS from water.

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Removal of dimethyl sulfide and t-butylmercaptan from city gas by adsorption on zeolites

Cited by 78 publications

References 20 publications

Decomposition of <i>t</i>-Butanethiol into Hydrogen Sulfide without Hydrogen Addition over H-Y and H-beta Zeolites

Decomposition of <i>t</i>-Butanethiol into Hydrogen Sulfide without Hydrogen Addition over H-Y and H-beta Zeolites

Removal of Dimethyl Sulfide from Aqueous Solution Using Cost-Effective Modified Chicken Manure Biochar Produced from Slow Pyrolysis

Adsorption of dimethyl trisulfide from aqueous solution on a low-cost adsorbent: thermally activated pinecone

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