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Effects of Ce-Doping on the Structure and NH3-SCR Activity of Fe/Beta Catalyst
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Effects of Ce-Doping on the Structure and NH3-SCR Activity of Fe/Beta Catalyst
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Li Jun, Ph. D., Senior Engineer, State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P. R. China, Tel: 0086-22-84379609, E-mail: lijun@catarc.ac.cn

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    摘要:

    用標(biāo)準(zhǔn)的離子交換法制備了Fe/Beta分子篩SCR催化劑，并將其涂覆在蜂窩陶瓷載體上進(jìn)行氮氧化物轉(zhuǎn)化率的性能評(píng)價(jià)。分子篩和Ce摻雜分子篩的結(jié)構(gòu)采用如電感耦合等離子體原子發(fā)射光譜（ICP-AES），低溫N2吸附，X射線(xiàn)衍射（XRD）儀，掃描電子顯微鏡（SEM），NH3程序升溫脫附（NH3-TPD）和H2程序升溫還原（H2-TPR）等進(jìn)行表征。結(jié)果表明，不論催化劑是在新鮮狀態(tài)還是經(jīng)過(guò)水熱/硫老化后，采用更好的沸石結(jié)構(gòu)的Fe-Beta分子篩結(jié)構(gòu)及鈰摻雜的催化劑都具有更寬的NOx轉(zhuǎn)化溫度窗口。由實(shí)驗(yàn)結(jié)果可知，較大的比表面積、均勻的小顆粒分子篩、規(guī)則的沸石骨架以及表面分散的不飽和的Ce4+對(duì)NH3-SCR的性能均有促進(jìn)作用。

    Abstract:

    Fe/Beta zeolite selective catalytic reduction (SCR) catalysts supported on honeycomb ceramic were prepared by a standard water ion exchange method and evaluated in NOx conversion process. The zeolite material characters and effects of Ce-doping on the zeolite were investigated by Inductively Coupled Plasma Atomic Emission Spectrum (ICP-AES), low temperature N2 adsorption, X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), NH3 Temperature-Programmed Desorption (NH3-TPD) and H2 Temperature-Programmed Reduction (H2-TPR). The results show that the Fe-Beta zeolite SCR catalysts with better zeolite structure and Ce-doping exhibit a more excellent catalytic ability on the NOx conversion temperature window, no matter for the fresh one or the one treated under hydrothermal or sulfur aged condition. It is deduced that the larger BET surface area, more uniform and smaller particles and more regular framework of zeolite as well as the unsaturated Ce4+ on zeolite have a great effect on the promotion of NH3-SCR performance.

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李 軍,賈莉偉,金煒陽(yáng),夏 峰,王家明. Effects of Ce-Doping on the Structure and NH3-SCR Activity of Fe/Beta Catalyst[J].稀有金屬材料與工程,2015,44(7):1612~1616.[Li Jun, Jia Liwei, Jin Weiyang, Xia Feng, Wang Jiaming. Effects of Ce-Doping on the Structure and NH3-SCR Activity of Fe/Beta Catalyst[J]. Rare Metal Materials and Engineering,2015,44(7):1612~1616.]
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  • 收稿日期:2014-07-22
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  • 在線(xiàn)發(fā)布日期: 2016-01-04
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