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研究了以离子交换法制备的Fe/ZSM-5上聚合态的Fe氧化物(FeOx)在催化N2O直接分解中的作用.Fe/ZSM-5催化剂利用600–900 ℃的高纯Ar处理,使催化剂中的FeOx发生聚合.利用一系列的表征手段(XRD,BET,DRIFTS,UV/vis-DRS,XAFS,N2O脉冲和O2-TPD)对催化剂进行了表征.结果发现,分子筛骨架外的FeOx在Fe/ZSM-5催化N2O分解中起重要作用;通过研究高温处理的Fe/ZSM-5催化剂中不同FeOx的比例与催化剂活性的关系,得到多核的FeOx是催化N2O分解的主要活性物种;并且,无定形态的FeOx中键长较长的Fe–O键((Fe–O)2)是参与反应的重要物种.
The effect of Fe oxide (FeOx) polymerized on Fe / ZSM-5 prepared by ion exchange method in the direct decomposition of N2O was studied.The Fe / ZSM-5 catalyst was treated with high purity Ar at 600-900 ℃ The catalyst FeOx was polymerized.The catalyst was characterized by a series of characterization methods (XRD, BET, DRIFTS, UV / vis-DRS, XAFS, N2O pulse and O2-TPD) .The results showed that the FeOx Fe / ZSM-5 catalyst plays an important role in the decomposition of N2O. By studying the relationship between the ratio of FeOx and the catalyst activity in Fe / ZSM-5 catalyst at high temperature, the multi-core FeOx is the main active species for N2O decomposition. FeOx amorphous FeOx longer bond length Fe-O bond ((Fe-O) 2) is an important species involved in the reaction.