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dc.contributor.authorZhang, Qinghong
dc.contributor.author张庆红
dc.contributor.authorGuo, Qian
dc.contributor.authorWang, Xiaoxing
dc.contributor.authorTetsuya Shishido
dc.contributor.authorWang, Ye
dc.contributor.author王野
dc.date.accessioned2011-10-04T12:02:16Z
dc.date.available2011-10-04T12:02:16Z
dc.date.issued2006-02
dc.identifier.citationJOURNAL OF CATALYSIS,2006,239(1):105-116zh_CN
dc.identifier.issn0021-9517
dc.identifier.urihttp://dx.doi.org/doi:10.1016/j.jcat.2006.01.023
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/10829
dc.description.abstractAlkali metal salt (KCl)-modified Fe-MFl and Fe-MCM-41 containing iron species in different locations have been studied for the epoxidation of propylene with nitrous oxide. In the allylic oxidation of propylene without modification, the samples with iron species in the framework positions showed slightly higher activity for the formation of acrolein and allyl alcohol. After modification with KCl, propylene oxide (PO) became the main product. Significant differences in PO formation activity were observed between the samples containing iron in different locations. For the Fe-MFl and the Fe-MCM-41 prepared by the direct hydrothemal (DHT) method, in which iron was located mainly in the framework position, much lower activity was obtained after KCl modification. In contrast, the Fe-MFI after steam treatment and the Fc-MCM-41 prepared by template ion-exchange (TIE) and conventional impregnation methods, which contained extra-framework iron species (e.g.. FeOx clusters), exhibited higher PO formation activity after modification. A PO selectivity of 80% could be achieved at a propylene conversion of 3.3% over the KCl-modified Fe-MCM-41 prepared by the TIE or the impregnation method at 598 K (time on stream, 70 min). The modification with KCl increased the dispersion of the extra-framework iron species. Consequently, highly dispersed extra-framework iron species, probably in tetrahedral coordination, are proposed for the epoxidation of propylene with nitrous oxide. (c) 2006 Elsevier Inc. All rights reserved.zh_CN
dc.language.isoenzh_CN
dc.publisherACADEMIC PRESS INC ELSEVIER SCIENCEzh_CN
dc.subjectpropylenezh_CN
dc.subjectepoxidationzh_CN
dc.subjectnitrous oxidezh_CN
dc.subjectFe-MFIzh_CN
dc.subjectFe-MCM-41zh_CN
dc.subjectextra-framework ironzh_CN
dc.titleIron-catalyzed propylene epoxidation by nitrous oxide: Toward understanding, the nature of active iron sites with modified Fe-MFI and Fe-MCM-41 catalystszh_CN
dc.typeArticlezh_CN


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