Preparation of novel CeMo(x) hollow microspheres for low-temperature SCR removal of NOx with NH3
作者： Sihui Zhan , Qiang Shi , Yu Zhang , Yi Li , Yang Tian
DOI: 10.1039/C6RA10720F
关键词:
摘要: A series of novel Mo doped CeO2 hollow microspheres have been successfully synthesized using carbon as templates, which were characterized by XRD, SEM, TEM, BET and used to selective catalytic reduction (SCR) NOx with ammonia at lower temperature. Compared pure microspheres, showed a better performance from 200–400 °C. The optimal molar ratios Mo/Ce surface active sites remove also investigated, can significantly affect the performances. Among all different molybdenum doping ratios, obtained CeMo(0.3) not only best SCR temperature but excellent stability H2O resistance, was attributed higher Bronsted acid reasonable Ce3+ content chemisorbed oxygen species, synergic effect between MoO3 based on XPS, NH3-TPD, H2-TPR in situ DRIFTS results. Additionally, according reactivity adsorbed NH3 species DRIFTS, low-temperature NH3-SCR activity resulted more NH4+ ions gaseous NO2 molecules (i.e., “fast SCR” reaction).
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