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   Preparation of Lanthanum-Nickel-Aluminium Perovskite Systems and Their Application in Methane-Reforming Reactions  
نویسنده Moradi P. ,Parvari M.
منبع Iranian Journal Of Chemical Engineering - 2006 - دوره : 3 - شماره : 3 - صفحه:29 -43
چکیده    In this study we developed lanixall-x03 perovskite systems using a sol-gel method (with propionic acid as solvent) to use in methane-reforming reactions for producing synthesis gas. to understand the roles of the nature of the precursor and calcination conditions on the formation of lanixall-x03, we carried out identifications using nmr, ft-ir, xrd, sem, and tem. the precursor structure is a function of raw materials and calcination conditions. nitrate salts of nickel, aluminium, and lanthanum, and calcinations at 750°c for 4 h gave pure lanixall-x03 perovskite with good homogeneity, even at nanoscopic scales. these systems are highly efficient catalysts in steam and the dry reforming of methane. various ratios of hydrogen to carbon monoxide in synthesis gas can be achieved by changing the feed type. we also investigated stabilization of these systems by studying the perovskite structure after reactivity tests. the optimum mixed perovskite for steam and dry reforming of methaneis lani0.3al0. 703. the total conversion of ch4 is rapidly obtained at 750°c in steam reforming with a h20/ch4 ratio — 3, the selectivity of co is lower (55%) and the yield of hydrogen (98%) is higher compared to the ratio h20/ch4 — l. after 170 h ofreaction, no deactivation had occurred, methane conversion remained higher than 90% at 750°c and in dry reforming, methane conversion and c0 yield are about 98% and 95% respectively.
کلیدواژه Nickel Perovskite ,Methane Dry Reforming ,Synthesis Gas
آدرس Iran University Of Science And Technology, Chemical Engineering College, ایران, Iran University Of Science And Technology, Chemical Engineering College, ایران
پست الکترونیکی parvari@iust.ac.ir

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