Direct NO decomposition over La2-xBaxNiO4 catalysts containing BaCO3 phase

Direct NO decomposition over La2-xBaxNiO4 catalysts containing BaCO3 phase
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在含有 BaCO3 相的 La2-xBaxNiO4 催化剂上直接分解 NO

DOI:
10.1016/j.apcatb.2008.01.025
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发表时间:
2008-08
影响因子:
22.1
通讯作者:
Guo Zhang
Guo Zhang
中科院分区:
化学1区
文献类型:
--
作者:
Honggang Fu;Yujun Zhu;Fulong Yuan;Dong Wang;Guo Zhang

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用柠檬酸盐法制备了La2−xBaxNiO4(x≤1.2)催化剂。X射线衍射谱和红外光谱表明,随着BaCO3的掺杂,BaCO3的析出增多,类钙钛矿结构严重扭曲。在无氧/有氧条件下,直接分解4%NO时,La1.2Ba0.8NiO4由类钙钛矿型结构相和BaCO3组成的N2产率最高。碘量法和H_2-TPR的结果表明,Ba量的增加导致了Ni3+含量的增加。O2-TPD和NO吸附测试证实了掺杂导致了氧空位(Vo)的增加。因此,提高了氧化还原能力和VO的量。实验结果表明,NO-TPD、NO2-TPD和原位漂移对NO-TPD和NO2-TPD催化活性的提高起到了重要作用。因此,BaCO3在加快催化NO分解循环中起着重要的作用。
La2−xBaxNiO4(x≤1.2) catalysts have been prepared by citrate method. XRD patterns and IR spectra indicate that with the doping of Ba, more BaCO3appears and perovskite-like structure is seriously distorted. In directly decomposing 4% NO, the highest N2yield is achieved with La1.2Ba0.8NiO4composed of perovskite-like structure phase and BaCO3in the absence/presence of oxygen. The results of iodometry and H2-TPR reveal that the increase in Ba causes the increase in Ni3+content. O2-TPD and NO adsorption tests confirm that Ba doping resulted in the increase in oxygen vacancy (Vo). Thus, the redox capability and the amount of Vo are enhanced. It is suggested that the BaCO3phase, NOxstorage component, contributes to the increase in activity by NO-TPD, NO2-TPD and in situ DRIFT. Thus, BaCO3plays an important role in quickening up the run of catalytic NO decomposition recycle.
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