铁前驱体对Fe/β催化NH_3-SCR反应性能的影响  

Influence of Iron Precursors on NH_3-SCR Behavior of Fe/β Catalyst

作　　者：张泽凯[1] 俞河[2] 廖冰冰[1] 黄海凤[2] 陈银飞[1] 

机构地区：[1]浙江工业大学化学工程与材料学院催化反应工程研究所,浙江杭州310014 [2]浙江工业大学生物与环境工程学院,浙江杭州310014

出　　处：《催化学报》2012年第3期576-580,共5页

基　　金：国家自然科学基金(20903080)~~

摘　　要：以硝酸铁、氯化铁和二茂铁等为前驱体,采用液相浸渍法制备了Fe/β催化剂,并将其用于氨选择性催化还原脱硝反应.并采用X射线衍射、透射电镜、N2吸附-脱附、H2程序升温还原以及NH3程序升温脱附等手段对催化剂进行了表征.结果表明,以二茂铁为前驱体制得的催化剂的活性明显优于其它两种前驱体.在60000h–1空速条件下,150oC时NOx转化率即可达到50%,260oC可实现完全转化.这是由于二茂铁的应用改善了铁活性物种在β分子筛上的分散度、颗粒尺寸和颗粒分布以及氧化还原性能.The precursor effects of Fe precursors on the selective catalytic reduction of NOx by NH3 （NH3-SCR） over Fe/β catalyst were evaluated. Three different precursors, ferrocene, ferric nitrate, and ferric chloride, were chosen to prepare Fe/β catalyst by liquid impregnation method. The catalyst samples were characterized by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, H2 temperature-programmed reduction, and NH3 temperature-programmed desorption. The results showed that the activity of Fe/β from ferrocene was superior to the others. Under the reaction condition of GHSV 60000 h–1, 50% conversion of NOx was reached at 150 oC and full conversion was obtained at 260 oC. Characterization indicated that ferrocene is profitable to improve the particle size, particle distribution, and redox properties of FeOx species, leading to the NH3-SCR activity promotion.

关 键 词：Β分子筛 二茂铁 前驱体 氨 选择性催化还原 氮氧化物 

分 类 号：O643.36[理学—物理化学]