采用水热法制备了一系列不同Fe含量的FeAlPO-5催化剂,并将其用于CH_4催化还原N_2O反应.结果表明,FeAlPO-5催化剂在此反应中表现出较高的低温活性.N_2吸附、X射线衍射和紫外可见光谱等表征结果表明,水热法制备的FeAlPO-5催化剂具有典型的AlPO-5分子筛结构.Fe含量对催化剂的活性及催化剂中Fe物种的分布有较大影响,当w(Fe)=2.4%时,催化剂除含有可促使CH_4低温还原N_2O反应的孤立态的Fe物种和低聚态的Fe物种外,还含有相当数量的可使N_4O直接催化分解的纳米态的Fe物种.
Fe-substituted AIPO-5 zeolite (FeAIPO-5 catalyst) samples with different Fe contents were prepared by the hydrothermal method and used in catalytic reduction of N_2O with CH_4, exhibiting good low-temperature activity. The AIPO-5 and FeAlPO-5 samples were charac-terized by N_2 physisorption, X-ray diffraction, and UV-visible spectroscopy. The results showed that the FeAlPO-5 samples had the typical structure as that of AlPO-5 zeolite. The Fe content had strong influence on the catalyst activity and the distribution of Fe species. The 2.4% FeAlPO-5 catalyst contained not only isolated Fe~Ⅲ and oligonuclear Fe~Ⅲ, being active for catalytic reduction of N_2O with CH4, but also a considerable nanosized Fe~Ⅲ, being responsible for N_2O decomposition.
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