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首页> 外文期刊>RSC Advances >Investigation of the interactions in CeO2–Fe2O3 binary metal oxides supported on ZSM-5 for NO removal by CO in the presence of O2, SO2 and steam
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Investigation of the interactions in CeO2–Fe2O3 binary metal oxides supported on ZSM-5 for NO removal by CO in the presence of O2, SO2 and steam

机译：ZSM-5负载CeO 2 –Fe 2 O 3 二元金属氧化物在CO存在下用于CO脱除NO的相互作用的研究O 2 ，SO 2 和蒸汽

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ZSM-5 series catalysts with different metal contents were prepared for NO removal by CO in the presence of O2, SO2 and steam via an impregnation method. The flash catalysts and used catalysts were characterized via XRD, BET, XPS, NH3-TPD, CO-TPR and in situ DRIFTS and their activities were tested in a fixed-bed reactor. The 10Ce–10Fe catalyst exhibited stable NO conversion of over 90% within the temperature range from 320 °C to 650 °C, and it has superior resistance to O2, SO2 and steam. The ZSM-5 structure was retained after loading Fe and Ce, and diffraction peaks of Fe2O3 and CeO2 were observed in the XRD spectra with an increase in the metal content. The specific surface area and pore volume of Ce–Fe/ZSM-5 decreased, and its average pore diameter increased. The Ce–Fe/ZSM-5 catalysts possess chemisorbed oxygen and lattice oxygen, and their various cations (Fe3+/Fe2+ and Ce4+/Ce3+) promote the production of oxygen vacancies, which are beneficial for the activation of N–O. The strong acid sites and some medium-strong acid sites are involved in the catalytic reaction as the active sites for Ce–Fe/ZSM-5 in NH3-TPD. The interaction between Fe2O3 and CeO2 (Ce3+ + Fe3+ ? Ce4+ + Fe2+) in the Ce–Fe/ZSM-5 catalyst improves its catalytic performance, reducing property, resistance to O2, SO2 and steam, and service life.
机译：制备了具有不同金属含量的ZSM-5系列催化剂，用于在O 2 ，SO 2 < / small>并通过浸渍法蒸 。通过XRD，BET，XPS，NH 3 -TPD，CO-TPR和原位表征了闪蒸催化剂和用过的催化剂 DRIFTS及其活性在固定床反应器中进行了测试。 10Ce-10Fe催化剂在320°C至650°C的温度范围内表现出稳定的NO转化率超过90％，并且对O 2 ，SO 2 和蒸汽。加载Fe和Ce后，ZSM-5结构得以保留，Fe 2 O 3 的衍射峰和在XRD光谱中观察到CeO 2 随金属含量的增加而增加。 Ce–Fe / ZSM-5的比表面积和孔体积减小，其平均孔径增大。 Ce–Fe / ZSM-5催化剂具有化学吸附的氧和晶格氧，以及它们的各种阳离子（Fe 3 + / Fe 2 + 和Ce 4 + / Ce 3 + ）促进氧空位的产生，这对于激活N–O很有帮助。 NH 3 -TPD中强酸位和一些中强酸位作为Ce-Fe / ZSM-5的活性位参与催化反应。 Fe 2 O 3 与CeO 2 之间的相互作用small>（Ce 3 + + Fe 3 + ？Ce 4 + + Fe 2 + ）改善了其催化性能，降低了性能，对O < sub> 2 ，SO 2 和蒸汽，以及使用寿命。

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