Catalytic formation of carbonyl sulfide during warm gas clean-up of simulated coal-derived fuel gas with Pd/γ-Al2O3 sorbents

Rupp, Erik C.; Granite, Evan J.; Stanko, Dennis C.

doi:10.1016/j.fuel.2011.06.055

Cited by 20 publications

(13 citation statements)

References 19 publications

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“…Among the chemical raw material gases, which are made from coal, oil and natural gas, sulfur compounds can generally be divided into two major categories of organic sulfur and inorganic sulfur. Organic sulfur contains carbonyl sulfide (COS), carbon disulfide (CS 2 ), thiophene, mercaptan, and so forth [1]. Inorganic sulfur is mainly hydrogen sulfide (H 2 S).…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Experiments have been carried out to test the ability of different sorbents to remove Hg 0 from coal-derived fuel gas at elevated temperatures (204–315 °C). Those studies have suggested that supported noble metals, such as palladium, can be used for capturing mercury, arsenic, selenium, and phosphorus from simulated fuel gases at elevated temperatures. − Fuel gas constituents, such as moisture, hydrogen, carbon oxides, and hydrogen sulfide, have either promotional or poisoning effects on the capture processes for mercury, arsenic, selenium, and phosphorus. ,, …”

Section: Introductionmentioning

confidence: 99%

Palladium–Iron Bimetal Sorbents for Simultaneous Capture of Hydrogen Sulfide and Mercury from Simulated Syngas

Han

Wang

et al. 2012

Energy Fuels

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Fe2O3/γ-Al2O3, PdO/γ-Al2O3, and PdO–Fe2O3/γ-Al2O3 sorbents were prepared using the pore volume impregnation method. Experiments to study the removal of Hg and H2S from simulated syngas were carried out using a conventional flow-type packed-bed reactor system over the temperature range of 100–300 °C. Sorbents before and after the adsorption of Hg and H2S were analyzed by Raman spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The experimental results show that the bimetal oxide PdO–Fe2O3/γ-Al2O3 sorbent can simultaneously remove Hg and H2S in syngas and the operation temperature can be as high as 200–300 °C. The high efficiency of Hg removal by PdO/γ-Al2O3 and H2S removal by Fe2O3/γ-Al2O3 enhances the ability of PdO–Fe2O3/γ-Al2O3 to remove Hg and H2S simultaneously at a relatively high temperature. H2 and CO can enhance the efficiency of the removal of Hg over the PdO–Fe2O3/γ-Al2O3 sorbent at 250 °C, but there is apparently no influence on the removal of H2S. On the basis of the analysis of the different capture performances for Hg and H2S between PdO/γ-Al2O3 and PdO–Fe2O3/γ-Al2O3, there are two possible mechanisms for the capture of Hg over bimetal oxides, namely, by formation of HgS or HgO and Pd–Hg amalgam. The reactions of Hg (adsorbed on the surface of the sorbent) with Pd (formed by reduction of PdO) and Sad [formed by the reaction of H2S with lattice oxygen in Fe2O3 (3H2S + Fe2O3 → 2FeS + Sad + 3H2O)] are the dominant factors.

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“…It was worth mentioning that the combination of 20% CO and 100 ppm of H 2 S resulted in an E cap value of only 80.5%, which can be ascribed to two causes: (1) H 2 S consumed the active component Pd for Hg 0 capture, thus reducing the E cap value over PCA sorbent, and (2) CO reacted with H 2 S to form COS, which competed with Hg 0 for active sites and was adsorbed strongly on the surface of palladium, hence inhibiting Hg 0 capture. The reactions involved in Hg 0 capture can be summarized as follows: PdO + CO → Pd + CO 2 normalH 2 normalS + CO → normalH 2 + COS …”

Section: Resultsmentioning

confidence: 99%

Elemental Mercury Capture from Syngas by Novel High-Temperature Sorbent Based on Pd–Ce Binary Metal Oxides

Hou

Zhou

You

et al. 2015

Ind. Eng. Chem. Res.

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CeO2 was doped into Pd/Al2O3 using an impregnation method to suppress the interference of H2S and to improve the ability to capture elemental mercury (Hg0) from syngas at high temperatures. As a result, the Hg0 capture performance was generally enhanced by the incorporation of Ce as a result of the consumption of H2S. The individual presence of H2 or CO resulted in the formation of Pd metal responsible for Hg0 capture and active ceria in reduced form for H2S removal, thus promoting the Hg0 removal. Meanwhile, H2S could react with CO to form COS, which competed with Hg0 for active sites, hence inhibiting Hg0 capture. The effect of HCl on Hg0 capture over PCA sorbents was found to be slightly promotional, because a small amount of Hg0 was oxidized to HgCl2. More importantly, the spent PCA sorbents could be easily reactivated, indicating that this material is a prospective candidate for Hg0 control from syngas.

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Catalytic formation of carbonyl sulfide during warm gas clean-up of simulated coal-derived fuel gas with Pd/γ-Al2O3 sorbents

Cited by 20 publications

References 19 publications

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

The Hydrolysis of Carbonyl Sulfide at Low Temperature: A Review

Palladium–Iron Bimetal Sorbents for Simultaneous Capture of Hydrogen Sulfide and Mercury from Simulated Syngas

Elemental Mercury Capture from Syngas by Novel High-Temperature Sorbent Based on Pd–Ce Binary Metal Oxides

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