Selective catalytic reduction of NO by NH3 on cerium modified faujasite zeolite prepared from alumin

• 作 者: Rahma Abid Gérard Delahay Hassib Tounsi
• 机 构: Laboratory of Advanced Materials,National School of Engineers of Sfax,University of Sfax,Tunisia“,”I
• 出 处: 稀土学报（英文版）
• 发表日期: 2020年3期
• 关键词: Aluminum scraps Ce-Y NH3-SCR Hydrothermal stability

This work was devoted to the study of the selective catalytic reduction of NO by NH3 on calcined and hydrothermal treated cerium loaded zeolite catalysts.The parent faujasite zeolite Na-F(Si/Al＝1.32 and SBET ＝ 749 m2/g)used as support for the preparation of the catalysts was obtained from industrial so-dium metasilicate and aluminum scraps.As expected,the NO conversion increases with increasing the percentage of cerium in the structure of the faujasite zeolite.Total NO conversion into N2 is reached at 400 C at a space velocity of 250 000 h-1.The high conversion is due to the redox shift between Ce3+/Ce4+and the strong acid sites related to the rare earth present in the framework that is the key in SCR of NO process.Moreover,the highest loaded cerium catalyst retains almost its activity after hydrothermal treatment at 850 C.This higher loading is desirable for both activity and stability provided that two stages of preparation are used to put the Ce ions in the sodalite cages.