دانلود مقاله Deactivation Kinetics of Cu/ZnO/Al2O3 via Methanol Steam Reforming for Pure Hydrogen Generation
سال انتشار: ۱۳۸۴
محل انتشار: دهمین کنگره ملی مهندسی شیمی ایران
تعداد صفحات: ۱۱
Khoshtinat Nikoo – Islamic Azad University, South of tehran, I.R.I
Towfighi Darian – Tarbiat modarres university, Department of Chemical engineering, I.R.I
Dehghani Mobarakeh – Research Institute of Petroleum Industry, I.R.I
methanol-water mixture. The tests were carried out at different temperatures: 250, 280 , 310°C for one week. The curves of the products yield were drawn at 250, 280 and 310 °C. In this work, effective reaction rate constant was calculated by determination of feed conversion throughout time on-stream and then were fitted with hypothetical model resulting from Fuentes expression including three adjustable parameters: KS, KF and SS/S0. Because of the main difference between adjustable SS/S0 in hypothetical sinteringmodel and its real magnitude, Fuentes model is not efficient for fitting and processing of experimental data. For this reason, general deactivation model based on aS/a0 instead of SS/S0 was used for fitting of experimental data with a hypothetical model. Determination of Copper surface area by N2O adsorption on Copper particles was done before and after runs. It is considered that this modified model is valid and useful for initial deactivation. Temperature has increasing effect on reaction rate constant, therefore, catalyst activity in the range of 250-310 °C.