SmMn2O5 catalysts modified with silver for soot oxidation: Dispersion of silver and distortion of mullite
SmMn2O5 catalysts modified with silver for soot oxidation: Dispersion of silver and distortion of mullite
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银改性SmMn2O5烟灰氧化催化剂：银的分散和莫来石的变形
DOI：
10.1016/j.apcatb.2020.119058
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Xiaodong Wu
中科院分区：
文献类型：
--
作者：
Baofang Jin;Baohuai Zhao;Shuang Liu;Zhenguo Li;Kaixiang Li;Rui Ran;Zhichun Si;Duan Weng;Xiaodong Wu
采用溶胶-凝胶法（Ag/SMO-sg）和浸渍法（Ag/SMO-im）对SmMn 2 O 5（SMO）莫来石进行了银改性。采用XRD、BET、TEM、XPS、ICP-AES、H2-O2滴定、H2-TPR、CO-TPR、烟灰程序升温还原等方法对催化剂进行了表征程序升温脱附（O2-TPD）、循环H2程序升温还原（Cycled H2-TPR）、NO程序升温氧化（NO-TPO）和程序升温氧化（soot-TPO）。金属银纳米粒子中观察到的莫来石基质的催化剂。对于Ag/SMO-sg，银可能结合到莫来石晶胞中以及高度分散的金属与载体之间的强电子相互作用增加了Mn 4 +/Mn 3+比率，并在莫来石中产生更多的结构缺陷，导致NO氧化增强，从而导致NO2辅助的烟灰燃烧。Ag的引入可以促进活性氧的生成/再生，从而加速碳烟在O2中的低温着火。因此，溶胶-凝胶法制备的Ag/SmMn 2 O 5在柴油机微粒捕集器中具有很好的应用前景。
The mullite SmMn2O5(SMO) was modified with silver for soot oxidation by two methods, i.e. sol-gel (Ag/SMO-sg) and impregnation (Ag/SMO-im). The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission spectrometry (ICP-AES), H2-O2titration, H2temperature-programmed reduction (H2-TPR), CO temperature-programmed reduction (CO-TPR), soot temperature-programmed reduction (soot-TPR), O2temperature-programmed desorption (O2-TPD), cycled H2temperature-programmed reduction (cycled H2-TPR), NO temperature-programmed oxidation (NO-TPO) and soot temperature-programmed oxidation (soot-TPO). Metallic silver nanoparticles were observed in the mullite matrix for both the catalysts. For Ag/SMO-sg, the possible incorporation of silver into the mullite crystal cell and strong electronic interaction between the highly dispersed metal and the support increase the Mn4+/Mn3+ratio and create more structural defects in the mullite, resulting in boosted NO oxidation and thereby NO2-assisted soot combustion. The introduction of Ag can promote the generation/regeneration of active oxygen, which accelerates the ignition of soot in O2at low temperatures. Therefore, the sol-gel-synthesized Ag/SmMn2O5is highly promising for application in diesel particulate filters.
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