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Seyed Hossein Mansourian,Shahrokh Shahhosseini,Ali Maleki 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
The possibility of using ultrasound irradiation to enhance a model fuel desulfurization process has beeninvestigated in this work. For this reason, oxidative desulfurization (ODS) and ultrasound assistedoxidative desulfurization (UAOD) processes were applied, using oxygen, as the only oxidative agent,and polyoxometalate (POM) catalysts. The catalysts were analyzed using FT-IR, XRD, EDX, SEM and N2adsorption–desorption isotherms along with BET. The response surface method was employed tooptimize the ODS and UAOD processes. The ODS results revealed the process could not convert morethat 70% of the DBT due to polymer deposition on the surface of the particles and lack of oxygen. Applying ultrasound irradiation in UAOD process solved these issues and increased the DBT conversionrate by 120%.
Experimental investigation of CO2 capture using sodium hydroxide particles in a fluidized bed
Ahad Ghaemi,Sareh Naeem,Shahrokh Shahhosseini 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
CO2 capture from air using sodium hydroxide solid sorbent in a laboratory scale fluidized bed reactor was investigated experimentally. The influence of three parameters of temperature, inlet CO2 volume percentage and inlet air flow rate on the CO2 removal rate was studied. Experimental results showed that the optimum rate was at 25 oC when the inlet CO2 volume percentage was 1%. The results also showed that the adsorption process was reactive, and the reaction mechanism depended on the reaction temperature. In addition, empirical observation revealed only one adsorption cycle happened at low temperatures (25-30 oC). As the temperature increased, the second adsorption cycle occurred and, finally, CO2 desorption cycle took place in the range of 90-115 oC.
Ahad Ghaemi,Meisam Torab-Mostaedi,Shahrokh Shahhosseini,Mehdi Asadollahzadeh 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
Dolomite, a natural adsorbent, was used for removal of Ag(I), Cu(II) and Co(II) from aqueous solutions. Adsorption parameters including pH, temperature and contact time have been investigated to obtain adsorption mechanism. The results of experiments showed that adsorption of the metal ions increased by increasing pH values up to 5.5. The adsorption process was initially fast. Equilibrium isotherm data were analyzed using Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Maximum adsorption capacity of Ag(I), Cu(II) and Co(II) was 1.34, 1.63and 2.84 mg/g at 20 oC, respectively. Kinetic models including Lagergren first-order and pseudo-second-order were used to test kinetic data. The results showed that pseudo-second-order has good agreement with experimental data. Thermodynamic parameters of the process were also investigated at different temperatures. The negative values of Gibbs free energy and enthalpy changes for Ag(I), Cu(II) and Co(II) indicated the spontaneous and exothermic nature of the adsorption process.