Study on selective hydrogen sulfide removal over carbon dioxide by catalytic oxidative absorption method with chelated iron as the catalyst |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210046, PR China;2. Jiangsu Engineering Research Center for Biomass Energy and Low Carbon Technology, Nanjing University, Nanjing 210046, PR China;3. Center of Materials Analysis, Nanjing University, Nanjing 210093, PR China;4. Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing 210093, PR China;1. Biotechnological Processes for Energy Production Unit – IMDEA Energy, 28935, Móstoles, Madrid, Spain;2. Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, 44511, Zagazig, Egypt;3. Biofuels Unit – Research Center for Energy, Environment and Technology (CIEMAT), 28040, Madrid, Spain;1. Chemical Engineering Graduate Program (Chem. Eng. Dept./UFSCar), Federal University of São Carlos (UFSCar), Rodovia Washington Luís, km 235, CEP: 13565-905 São Carlos, SP, Brazil;2. Chemical Engineering Department/UFSCar, Federal University of São Carlos (UFSCar), Rodovia Washington Luís, km 235, CEP: 13565-905 São Carlos, SP, Brazil;1. Livestock Development Group (LDG), Faculty of Life Sciences, University of Reading, Reading, RG6 6AR, UK;2. Sustainable Agriculture and Food Research Division, Faculty of Life Sciences, University of Reading, Reading, RG6 6AR, UK;1. Aristotle University of Thessaloniki, Department of Chemical Engineering, Environmental Engineering Laboratory, 54124, Thessaloniki, Greece;2. University of Ioannina, Department of Biological Application and Technology, University Campus, 45110, Ioannina, Greece |
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| Abstract: | H2S is a detrimental impurity that must be removed for upgrading biogas to biomethane. H2S removal selectivity over CO2 employing catalytic oxidative absorption method and its influence factors were studied in this work. The desulfurization experiments were performed in a laboratory apparatus using EDTA-Fe as the catalyst and metered mixture of 60% (v/v) CH4, 33% (v/v) CO2 and 2000–3000 ppmv H2S balanced by N2 as the simulated biogas. It was found that for a given catalytic oxidative desulfurization system, it exists a critical pH, at which desulfurization selectivity achieves the highest. It was also observed that desulfurization selectivity increased along with the increase of chelated iron concentration, gas flow rate, and ratio of gas flow rate to liquid flow rate (G/L). This demonstrated that high selectivity and high efficiency for biogas desulfurization could both be achieved through optimizing these parameters. Specific to the desulfurization system of this work, when the gas flow rate was set as 1.1 L/min, after optimizing the above mentioned parameters, i.e. EDTA-Fe concentration of 0.084 mol/L, absorption solution pH of 7.8, and G/L of 55, the desulfurization selectivity factor reached 142.1 with H2S removal efficiency attained 96.7%. |
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| Keywords: | Biogas Hydrogen sulfide Carbon dioxide Selective desulfurization Catalytic oxidative absorption Chelated iron |
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