Kinetic modelling of the hydrolysis of carbonyl sulfide catalyzed by either titania or alumina

Tong, Shimin; Lana, I. G. Dalla; Chuang, Karl T.

doi:10.1002/cjce.5450710308

Cited by 29 publications

(24 citation statements)

References 7 publications

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“…Tong et al [67] studied the hydrolysis of carbonyl sulfide under medium temperature conditions and concluded that the catalytic hydrolysis of carbonyl sulfide is a first-order reaction with respect to carbonyl sulfide, while the reaction order of water is influenced by the partial pressure of water. When the partial pressure of water is 0.1–0.26, the reaction order of water is 0.4.…”

Section: Reaction Kinetics Of Cos Hydrolysismentioning

confidence: 99%

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

Zhao

Tang

et al. 2013

The Scientific World Journal

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Catalytic hydrolysis technology of carbonyl sulfide (COS) at low temperature was reviewed, including the development of catalysts, reaction kinetics, and reaction mechanism of COS hydrolysis. It was indicated that the catalysts are mainly involved metal oxide and activated carbon. The active ingredients which can load on COS hydrolysis catalyst include alkali metal, alkaline earth metal, transition metal oxides, rare earth metal oxides, mixed metal oxides, and nanometal oxides. The catalytic hydrolysis of COS is a first-order reaction with respect to carbonyl sulfide, while the reaction order of water changes as the reaction conditions change. The controlling steps are also different because the reaction conditions such as concentration of carbonyl sulfide, reaction temperature, water-air ratio, and reaction atmosphere are different. The hydrolysis of carbonyl sulfide is base-catalyzed reaction, and the force of the base site has an important effect on the hydrolysis of carbonyl sulfide.

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Section: Reaction Kinetics Of Cos Hydrolysismentioning

confidence: 99%

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

Zhao

Tang

et al. 2013

The Scientific World Journal

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“…To simulate the performance of the catalytic converters in a modified Claus process plant, knowledge of the kinetics of the hydrolysis of CS2 or COS is needed. To date, the kinetics of hydrolysis of COS have been examined (Tong et al, 1993). This paper describes further results, obtained from a study of the kinetics of hydrolysis of CS2 over either alumina or titania catalysts.…”

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confidence: 99%

Kinetic modeling of the hydrolysis of carbon disulfide catalyzed by either titania or alumina

1995

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The reaction rates for the hydrolysis of CS2 on either alumina (Kaiser 201) or titania (CRS 31) were measured at 150 kPa and from 270 to 330°C using a laboratory Berty reactor over ranges of water concentration (2–12 mol%) and CS2 concentration (0.5–2 mol%). Four mechanism‐related model functions were tested in the search for the best‐fitting rate function by using non‐linear regression techniques. The results show that the Eley‐Rideal rate function best‐fitted the kinetics using either Kaiser 201 or CRS 31 with different parameters. The kinetic parameters obtained confirm that CRS 31 appears to have the higher activity of the two catalysts for CS2 hydrolysis. The strong adsorption of water vapor on each of the two catalysts studied inhibits the hydrolysis rate and affords an effective reaction order close to zero for H2O, possibly by saturating the catalysis surface and reducing the fraction of catalyst surface available for CS2 and COS adsorption.

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“…Therefore, under operating conditions close to industrial conditions, TiO 2 based catalysts seem to be more active than alumina catalysts. For example, this has been reported in a comparative study on commercial catalysts based on alumina (Kaiser-201, Kaiser Aluminum and Chemicals) and titania (CRS31, Axens) [91,92]. Concerning any kind of catalyst, the specific surface area is a key parameter, COS conversion rate being favored when catalyst surface increases [88].…”

Section: Cos Removalmentioning

confidence: 96%

“…Considering the activation energy, gamma alumina materials might be more active than TiO 2 materials [89,91], and should thus favor COS hydrolysis from lower temperature (T < 200°C). However, some experimental observations show the opposite; water, which is necessary to the reaction, can adsorb on catalyst surface and inhibit the catalytic activity.…”

Section: Cos Removalmentioning

confidence: 99%

Synthesis Gas Purification

Chiche

Diverchy

Lucquin

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Purification des gaz de synthe`se -Les proce´de´s de synthe`se de biocarburants par voie Fischer-Tropsch (FT), voies B-XTL, repre´sentent des alternatives prometteuses pour la production d'e´nergie. Ces proce´de´s permettent la conversion en carburants de synthe`se de biomasse lignocellulosique, e´ventuellement mise en oeuvre en me´lange avec des charges fossiles telles que petcoke, charbons ou re´sidus sous vide. Pour ce faire, une e´tape de gaze´ification convertit la charge carbone´e en un gaz de synthe`se (me´lange de CO et H 2 ), lequel, apre`s ajustement du ratio H 2 /CO et e´limination du CO 2 , subit ensuite la re´action de FischerTropsch. Les gaz de synthe`se contiennent cependant de nombreuses impurete´s qui ne´cessitent d'eˆtre e´limine´es afin d'e´viter l'empoisonnement des catalyseurs Fischer-Tropsch. En raison de la grande varie´te´de charges pouvant eˆtre mises en oeuvre, la composition des gaz de synthe`se est susceptible de subir d'importantes variations, en particulier de part la nature des impurete´s (e´le´ments, spe´ciation) pre´sentes ainsi que leurs teneurs relatives. La composition des gaz de synthe`se est e´galement soumise a`des spe´cifications extreˆmement se´ve`res en terme de purete´lie´es a`l'importante sensibilite´aux poisons des catalyseurs FT. Pour ces raisons, la purification des gaz de synthe`se constitue un de´fi majeur pour le de´veloppement des proce´de´s B-XTL. Dans cet article, nous pre´sentons les principaux enjeux lie´s a`la purification des gaz de synthe`se. Les diffe´rents types d'impurete´s pouvant eˆtre pre´sentes dans les gaz de synthe`se sont pre´sente´es. L'influence de la nature de la charge, des technologies de gaze´ification ainsi que des conditions ope´ratoires associe´es sur la nature des impurete´s et leurs teneurs relatives est discute´e. Une attention particulie`re est porte´e au devenir des compose´s soufre´s, azote´s, des haloge`nes, me´taux lourds et me´taux de transition. Les principales technologies de purification des gaz de synthe`se (adsorption, absorption, re´actions catalytiques, etc.) sont finalement de´crites, ainsi que les de´fis associe´s.Abstract -Synthesis Gas Purification -Fischer-Tropsch (FT) based B-XTL processes are attractive alternatives for future energy production. These processes aim at converting lignocellulosic biomass possibly in co-processing with petcoke, coal, or vacuum residues into synthetic biofuels. A gasification step converts the feed into a synthesis gas (CO and H 2 mixture), which undergoes the Fischer-Tropsch reaction after H 2 /CO ratio adjustment and CO 2 removal. However synthesis gas also contains various impurities that must be removed in order to prevent Fischer-Tropsch catalyst poisoning. Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 68 (2013), No. 4, pp. 707-723 Copyright Ó 2013, IFP Energies nouvelles DOI: 10.2516 Due to the large feedstocks variety that can be processed, significant variations of the composition of the synthesis gas are expected. Especially, this affects the ...

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Kinetic modelling of the hydrolysis of carbonyl sulfide catalyzed by either titania or alumina

Cited by 29 publications

References 7 publications

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

Kinetic modeling of the hydrolysis of carbon disulfide catalyzed by either titania or alumina

Synthesis Gas Purification

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