Promoting effect of acid sites on NH3-SCO activity with water vapor participation for Pt-Fe/ZSM-5 catalyst
Promoting effect of acid sites on NH3-SCO activity with water vapor participation for Pt-Fe/ZSM-5 catalyst
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水蒸气参与下酸位对 Pt-Fe/ZSM-5 催化剂 NH3-SCO 活性的促进作用
DOI：
10.1016/j.cattod.2020.06.039
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发表时间：
2020-06
期刊：
影响因子：
5.3
通讯作者：
Hong He
中科院分区：
文献类型：
--
作者：
Fei Wang;Ying Zhu;Zhao Li;Yulong Shan;Wenpo Shan;Xiaoyan Shi;Yunbo Yu;Changbin Zhang;Kai Li;Ping Ning;Yan Zhang;Hong He
近年来研究发现，氨（NH3）在烟气脱硝过程中对灰霾的形成起着重要的促进作用。考虑到柴油机尾气高温高湿的应用条件和NH3-SCO体系的位置，选择Pt/Fe/ZSM-5催化剂。本文采用离子交换法制备了两种不同硅铝比（25，50）的Pt-Fe/ZSM-5催化剂，并比较了在干态和湿态（5%H_2O）下的NH_3-SCO活性。Si/Al 25样品比Si/Al 50样品具有更高的本征活性（干燥环境）。而Si/Al 25样品的活性随H2O的加入而急剧下降，而Si/Al 50样品则保持较高的活性水平。BET、XRD、XPS、H2-TPR、NH3-TPD和原位DRIFTS表征结果表明，在NH3-SCO反应中，催化剂中大量的金属Pt（Pt°）有利于活性的提高，强酸性中心决定了催化剂的抗水性能。
Ammonia (NH3) slip from denitration (deNOx) process has been increasingly concerned due to the recent findings that NH3played an important role in promoting the formation of haze. Considering the high-temperature and humidity application conditions of diesel exhaust and the location of NH3-SCO system, Pt/Fe/ZSM-5 catalyst was selected. In this work, Pt-Fe/ZSM-5 catalysts with two different Si/Al ratios (25, 50) were prepared through ion-exchange method and the NH3-SCO activity were compared both in dry and wet (5% H2O) circumstances. The Si/Al 25 sample exhibited higher intrinsic activity (dry circumstance) than the Si/Al 50 sample. However, with H2O addition the activity of Si/Al 25 sample decreased dramatically while Si/Al 50 sample maintained higher level. BET, XRD, XPS, H2-TPR, NH3-TPD andin situDRIFTS characterization results showed that abundant metallic Pt (Pt°) was beneficial to NH3-SCO activity, strong acid site determined the water-resisting property of the catalysts during NH3-SCO with H2O participation.
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