【作者】 王立； 张菊；

【Author】 Wang Li (Detartment of Polymer Science and Engineering,Zhejiang University,Hangzhou,310027) Zhang Ju (Catalytic Institute,Hangzhou University,Hangzhou,310027)

【机构】 浙江大学高分子科学与工程学系； 杭州大学催化研究所；

【摘要】 <正>某些Cu/分子筛有很好的NO分解活性,已有许多文献报道了它们的催化活性和结构状态方面的研究结果。但在催化机理等方面还有许多问题需要进一步探讨。ZSM-5和Ferrierite有比较接近的孔结构,但Cu/ZSM-5和Cu/Ferrierite的催化活性相差甚大。ESR是一种很灵敏的用以获得过渡金属络合物配位状态的更多还原

【Abstract】 After the dehydration,oxidation and NO absorption,at least 6 new Cu species are found on Cu/zeolite.ESR signals Of Cu/ZSM-5 dehydrated and oxidized change obviously.The signals of two new Cu secies with g¹⁰（?）2.328,A¹⁰（?）149.3G and g¹¹（?）=2.276,A¹¹（?）=174.1G respectively appear,the former originating from Cu species with square pyramidal coordination and the latter with sqare planar coordination.A surprising result is observed in the ESR spectra of Cu/Ferrierite dehydrated and oxidized which indicate two new species form with g⁹（?）=2.327,A⁹（?）=154.7G and g⁸（?）=2.282,A⁸（?）=157.3G.They originate from two Cu species with square pyramidal coordination.After NO absorption,ESR spectra of Cu/Ferrierite indicate species 9 unchanges,species 8 disappears and new species 7 forms.And ESR spectra of Cu/ZSM-5 indicate a similar change.A new Cu species with g¹²（?）=2.30,A¹²（?）=164G appears which seems responsible for high NO decomposition activity.更多还原