{"title":"Solid-state defects in calcined CaA zeolite","authors":"Hideyuki Oka, Kunikazu Kamioka, Yuji Tokunaga, Tadashi Okada","doi":"10.1016/S0144-2449(97)00120-6","DOIUrl":null,"url":null,"abstract":"<div><p>Ca ion-exchanged zeolites have been characterized by electron spin resonance (e.s.r.), <sup>27</sup>Al magic-angle spinning nuclear magnetic resonance (<em>MAS</em> n.m.r.), <sup>29</sup>Si <em>MAS</em> n.m.r., and diffuse reflectance Fourier transform infrared spectroscopy (i.r.). The presence of the radical species that are assigned to solid-state defects was confirmed in CaA zeolites, and the amount of the radical was dependent on the thermal treatment temperature in air. The present experimental results suggest that the formation of extralattice aluminum in the CaA sodalite cage and the change of calcium species by thermal treatment relate to the formation and disappearance of radical species.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 455-457"},"PeriodicalIF":0.0000,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00120-6","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeolites","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0144244997001206","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
Ca ion-exchanged zeolites have been characterized by electron spin resonance (e.s.r.), 27Al magic-angle spinning nuclear magnetic resonance (MAS n.m.r.), 29Si MAS n.m.r., and diffuse reflectance Fourier transform infrared spectroscopy (i.r.). The presence of the radical species that are assigned to solid-state defects was confirmed in CaA zeolites, and the amount of the radical was dependent on the thermal treatment temperature in air. The present experimental results suggest that the formation of extralattice aluminum in the CaA sodalite cage and the change of calcium species by thermal treatment relate to the formation and disappearance of radical species.
采用电子自旋共振(e.s.r)、27Al魔角自旋核磁共振(MAS n.m.r)、29Si MAS n.m.r和漫反射傅里叶变换红外光谱(i.r)对钙离子交换沸石进行了表征。在CaA沸石中，被分配到固态缺陷的自由基物种的存在得到了证实，并且自由基的数量取决于空气中的热处理温度。实验结果表明，CaA钠岩笼中晶格外铝的形成和热处理过程中钙种类的变化与自由基种类的形成和消失有关。
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