Insights into synergistic effect of chromium oxides and ceria supported on Ti-PILC for NO oxidation and their surface species study
Insights into synergistic effect of chromium oxides and ceria supported on Ti-PILC for NO oxidation and their surface species study
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Ti-PILC 负载的氧化铬和二氧化铈对 NO 氧化的协同效应及其表面形态研究的见解
DOI：
10.1016/j.apsusc.2014.11.024
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发表时间：
2015-01
影响因子：
6.7
通讯作者：
Zhong Q
中科院分区：
文献类型：
--
作者：
Zhong L;Cai W;Yang Y;Zhong Q
以Ti-PILC为载体，研究了氧化铬和氧化铈对NO氧化的协同效应。本研究的目的是研究铬氧化物和二氧化铈在Cr 1 −xCex/TP催化剂上的作用及其在织构性质、氧化还原性能和表面物种方面的协同效应。采用BET比表面积分析、XRD、TEM、H2-TPR、程序升温脱附等手段对催化剂进行了表征（NO-TPD，O2-TPD），光致发光光谱（PL），X射线光电子能谱（XPS）和原位漫反射红外傅里叶变换光谱（原位DRIFTS）。结果表明，CrOx有利于NO的吸附和活化，生成NO+和硝酸盐，而CeO 2则倾向于通过氧空位活化O2生成硝酸盐。此外，原位漫反射傅里叶变换红外光谱的结果进一步证实了表面物种不仅与反应气氛有关，而且与反应温度有关。因此，初步提出了一个可能的反应模型。
The insights of synergistic effect between chromium oxides and ceria supported on Ti-PILC were studied for NO oxidation. The aim of this study was to investigate the role of chromium oxides and ceria and their synergistic effect in textural properties, redox performance and surface species over the Cr1−xCex/TP catalysts. These catalysts were investigated in detail by means of Brunauer–Emmertt–Teller (BET) surface area analysis, X-ray diffraction (XRD), transmission electron microscope (TEM), temperature-programmed reduction of H2(H2-TPR), temperature-programmed desorption (NO-TPD, O2-TPD), photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). It has been found that CrOxwere beneficial to adsorb and activate NO to form NO+and then generate nitrates while ceria were inclined to activate O2via oxygen vacancies to produce nitrates. Besides, the results of in situ DRIFTS further demonstrated that surface species were associated with not only reaction atmosphere but also reaction temperature. Hence, a possible reaction model was tentatively proposed.
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