Oxidative Desulfurization of Gas Condensate by Molybdenum-Based Polyoxometalates
Subject Areas :Zohre Taherkhani 1 , Mohammad Hasan Ghetmir 2 , Mahmood Andache 3
1 - استادیار گروه پژوهشی طراحی فرایندهای شیمیایی، جهاد دانشگاهی، دانشکده فنی، دانشگاه تهران، تهران، ایران
2 - Department of Chemistry, Omidiyeh Branch, Islamic Azad University, Omidiye, Iran
3 - Department of Chemistry, Alburz Campus, University of Tehran, Tehran, Iran
Keywords: catalyst, Polyoxometalates, oxidative desulfurization (ODS) process, gas condensate,
Abstract :
The presence of sulfur compounds in gas condensate is one of the problems in the field of fuel. In this study, the oxidative desulfurization (ODS) process of gas condensate of Ilam refinery was completely studied using molybdenum-based polyoxometalates catalyst. The catalyst was synthesized using a simple method and characterized by FTIR and BET tests. The ODS catalytic activity of gas condensate with total sulfur of 3780 ppm was evaluated in the presence of peroxide hydrogen. The effect of catalyst amount, oxidizing agent amount and operating parameters including temperature, time and type of extraction solvent was investigated on the efficiency of ODS process and solvent effectiveness factor. The results showed that the highest conversion and effectiveness factor were 97.4 % and 8.11, respectively under optimal conditions of catalyst amount of 0.02 wt.% relative to the condensate, the oxidizing agent amount of 6.64 wt.%, temperature of 70 °C and reaction time of 3 h in the presence of dimethylformamide solvent. At this condition, the total sulfur content of the gas condensate reduced from 3780 to 100 ppm. The results showed that the efficiency of ODS process is firstly increased by increasing the temperature and catalyst molar ratio, and then the inverse trend is observed. It was concluded that the reaction time had a positive effect on ODS efficiency. Also, the kinetics and mechanism of ODS reaction were discussed and the mean constant desulfurization rate of ODS was obtained to be 0.022 min-1.
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_||_[1] Lei, W.; Wenya, W.; Mominou, N.; Liu, L.; Li, S.; Appl. Catal. B 193, 180–188, 2016.
[2] Campos-Martin, J.M.; Capel-Sanchez, M.C.; Fierro, J.L.G.; Green Chem. 6, 557–562, 2004.
[3] Mondal, S.; Hangun-Balkir, Y.; Alexandrova, L.; Link, D.; Howard, B.; Zandhuis, P.; Catal. Today. 116, 554–561, 2016.
[4] Triantafyllidis, S.K.; Deliyanni, E.A.; Chem. Eng. J. 236, 406–414, 2014.
[5] Mei, H.; Mei, B.W.; Yen, T.F.; Fuel 82, 405–414, 2003.
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[8] Huitema, E.M.; Schwietert, D.; Mandel, J.R.; Nagatsuka, S.; “Worldwide fuel charter: Gasoline and diesel fuel, 6th edition”, Worldwide Fuel Charter Committee, 2019.
[9] “Atmospheric distillation petroleum products - Test method”, ISIRI 6261, 2003.
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[14] Lü, H.; Ren, W.; Liao, W.; Chen, W.; Li, Y.; Suo, Z.; Appl. Catal. B 138-139, 79-83, 2013.
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