پديد آورنده :
قاسمي نجف آبادي، صمد
عنوان :
احياي موليبدنيت توسط متان در حضور آهك
گرايش تحصيلي :
مهندسي مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
پانزده،156ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمد حسن عباسي، علي سعيدي
تاريخ نمايه سازي :
15/1/90
استاد داور :
جليل وحدتي خاكي، اسكندر كشاورز علمداري، مسعود پنجه پور
كد ايرانداك :
ID359 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Reduction of Molybdenite with Methane in the presence of Lime Samad Ghasemi Najafabadi samad ghasemi@yahoo com March 2 2011 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran 1st Supervisor Mohammad Hasan Abbasi abbasi32@cc iut ac ir 2nd Supervisor Ali Saeidi a saidi@cc iut ac ir 1st Advisor Ali Shafyei Department Graduate Coordinator Masoud Panjepour Abstract The thermodynamics and kinetics of molybdenite MoS2 reduction with methane in the presence of lime CaO has been investigated The thermodynamic investigation resulted in construction of stability diagrams of molybdenum compounds In addition to stability regions of Mo Mo2C and MoC the carbon deposition area was also identified A U shaped quartz micro reactor was used for MoS2 reduction with CH4 in the presence of lime The effluent gases were analyzed quantitatively by an online gas chromatograph The reduced fraction was determined as a function of time by noting the gas flow rate and concentration of oxygen containing gases Analyzing the partially reduced solid phase showed the formation of CaMoO4 as an intermediate phase Hence the mechanism proposed for reduction of MoS2 CaO with CH4 involves the direct reduction of MoS2 with CH4 to form Mo2C and sulfur containing gases The sulfur containing gases are captured by CaO to form CaS CO g CO2 g and H2O g The unreacted MoS2 is oxidized by CO g CO2 g and H2O g to form MoO3 g which reacted with CaO to form CaMoO4 on CaO particles Finally CaMoO4 and remaining MoS2 are further reduced with CH4 Characterization of solid samples was carried out by XRD CHN and FE SEM equipped with EDS providing results consistent with the proposed reaction pathways The results of isothermal kinetic analysis was in consistence with the 2 step proposed mechanism In the first step CaMoO4 is formed according to power law kinetic model with the activation energy of 95kJ mol In the second step of reaction the as formed CaMoO4 and remaining MoS2 were reduced with CH4 and the results were fitted to tridimensional diffusion model and the calculated activation energy was 10kJ mol Keywords Molybdenite Reduction Methane Lime Thermodynamics Kinetics
استاد راهنما :
محمد حسن عباسي، علي سعيدي
استاد داور :
جليل وحدتي خاكي، اسكندر كشاورز علمداري، مسعود پنجه پور
