Simultaneous catalytic hydrolysis of low concentration of carbonyl sulfide and carbon disulfide by impregnated microwave activated carbon at low temperatures

Wang

et al. 2017

J Chem Sci

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The deactivation mechanism of the simultaneous removal of COS and CS 2 over a Fe-Cu-Ni/MCSAC catalyst was investigated using SEM/EDS, XPS and in situ DRIFTS methods. The results show that the catalytic hydrolysis of COS and CS 2 over the Fe-Cu-Ni/MCSAC catalyst involves two steps: hydrolysis of COS/CS 2 and oxidation of H 2 S. The SEM/EDS and XPS results indicate that that catalytic hydrolysis of CS 2 can be achieved by the actions of alkaline groups and active components. When O 2 was introduced into the system, oxidation of H 2 S occurred viaH 2 S → S → SO 2− 4 /sulphate. In situ DRIFTS experiments indicated that the formation of sulphate may occur as follows: (a) H 2 S + O 2 → S + H 2 O, (b) S+O 2 → SO , (c)-COO+H 2 S →-CH+S-O, (d) C-OH+H 2 S →-CH+S-O. The in situ DRIFTS experiments also indicated that the C-OH groups,-COO groups and O 2 played important roles in the deactivation of the catalyst, which was consistent with the XPS results. Meanwhile, the SO 2− 4 /sulphate content increased during the reaction, which led to its occupancy of the catalyst's surface activity sites. Additionally, the alkaline groups and active components were removed, which could also result in the deactivation of the catalysts. Keywords. Deactivation mechanism; simultaneous catalytic hydrolysis of CS 2 and COS; Fe-Cu-Ni/MCSAC catalyst; closed carbide furnace tail gas.

Section: Materials Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deactivation mechanism of the simultaneous removal of carbonyl sulphide and carbon disulphide over Fe–Cu–Ni/MCSAC catalysts

Wang

et al. 2017

J Chem Sci

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“…12,13 Honghong Yi et al prepared microwave coconut shell biochar for catalytic hydrolysis of CS 2 . 14 The results indicated that the catalyst had a high removal efficiency of CS 2 . Meanwhile, more microporous structure and high specific surface area promoted the catalytic hydrolysis of CS 2 .…”

mentioning

confidence: 92%

“…In these methods, catalytic hydrolysis characterizes low operation cost, high desulfurization efficiency, and low secondary pollution . Honghong Yi et al prepared microwave coconut shell biochar for catalytic hydrolysis of CS 2 . The results indicated that the catalyst had a high removal efficiency of CS 2 .…”

Section: Introductionmentioning

confidence: 99%

Influence of surface characteristics on carbon disulfide catalytic hydrolysis over modified lake sediment biochar and research on deactivated mechanism

Surface & Interface Analysis

Sun

et al. 2019

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A series of lake sediment biochar (LSB) catalysts modified by metal oxides and basic functional groups were utilized for removal of carbon disulfide (CS2) in yellow phosphorus tail gas. The influences of preparation and modification conditions for surface characteristics of Fe‐KOH/LSB on removal of CS2 were investigated. Surface area and pore structure analyses indicated that preparation processes were aimed to increase the micropore structure of LSB. Diffuse reflection using transform of Fourier infrared radiation results showed that Fe had high hydrolysis activity for CS2 and low oxidation activity for H2S. Thermogravimetric/differential thermal analysis results indicated that low calcination temperature was not conducive to the generation of Fe2O3 and high calcination temperature led to the oxidation of LSB. CO2 temperature programmed desorption results stated that high alkalinity site strength could improve the catalytic hydrolysis performance. High KOH content could enhance alkalinity site strength but led to the block of pore. These modification factors mainly controlled the catalytic hydrolysis ability of Fe‐KOH/LSB. X‐ray photoelectron spectroscopy results claimed that the deactivation of Fe‐KOH/LSB was attributed to the generation of S and sulfate, and the consumption of active component. In the deactivation process, S and sulfate generated and covered the activity sites, and Fe2O3 was converted into FeSO4 or Fe2(SO4)3, which led to the deactivation.

Energy Utilization of Yellow Phosphorus Tail Gas: Simultaneous Catalytic Hydrolysis of Carbonyl Sulfide and Carbon Disulfide at Low Temperature

Ning

et al. 2014

Energy Tech

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The CO in yellow phosphorus tail gas can be used as energy source in the one‐carbon chemical industry, but the harmful gases carbonyl sulfide (COS) and carbon disulfide (CS2) are in co‐existence with CO and so must be removed. Modified microwave coal‐based activated carbon (Fe/MCAC) loaded with different metal oxides was manufactured by a sol–gel process, and used for the simultaneous catalytic hydrolysis of COS and CS2 at low temperature (30–70 °C). The influences of Cu–Ni doping and reaction conditions on catalytic hydrolysis reaction were investigated. The results showed that the optimum addition agents are copper and nickel, and the best mole ratio of Fe/Cu/Ni was 10:2:0.5. The X‐ray diffractometry results show that the doping agent could control the generation of sulfate, which can suppress the hydrolysis activity of the catalysts. Further characterization revealed that larger specific surface areas and pore volumes are favorable and enhance the catalytic hydrolysis activities. The products of simultaneous catalytic hydrolysis (S/SO42− species) could block the pore structure and surface active sites, which leads to a decline of the catalytic hydrolysis activity. Excessively high reaction temperatures (>50 °C) could enhance the catalytic hydrolysis of COS but inhibit catalytic hydrolysis of CS2. Excessively high relative humidity (RH) and O2 content could lead to formation of more sulfates, and decrease the catalytic efficiencies towards simultaneous hydrolysis of COS and CS2.