{"title":"磷酸阴离子存在下冠醚介导FAU型和emt型沸石的合成:镓掺入的研究","authors":"B. De Witte , J. Patarin , T. Cholley","doi":"10.1016/S0927-6513(97)00009-6","DOIUrl":null,"url":null,"abstract":"<div><p>Syntheses were performed in the system 10SiO<sub>2</sub>:<em>y</em>Al<sub>2</sub>O<sub>3</sub>:(1−<em>y</em>)Ga<sub>2</sub>O<sub>3</sub>:<em>z</em>P<sub>2</sub>O<sub>5</sub>:(2.4−4.1)Na<sub>2</sub>O:0.4(18C-6 or 15C-5):(140−180)H<sub>2</sub>O. For the Si-Al system, the presence of P<sub>2</sub>O<sub>5</sub> allows the crystallization of EMT at high alkalinity, due to the complexation of Al(OH)4/− by phosphate anions. Remarkably, this complexation is less efficient when 18C-6 is replaced by 15C-5, giving FAU phases with low Si/Al ratio. The addition of small amounts of Ga (<em>y</em>=0.05–0.1) leads to intergrowth formation of EMT and FAU. This is ascribed to the preferential location of Ga in the double six-rings which connect the successive FAU sheets. In the absence of P<sub>2</sub>O<sub>5</sub>, Ga is less reactive than Al and will be more homogeneously distributed over the framework. Under these conditions, up to 25% of Al can be substituted by Ga in the EMT structure.</p></div>","PeriodicalId":100926,"journal":{"name":"Microporous Materials","volume":"10 4","pages":"Pages 189-198"},"PeriodicalIF":0.0000,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00009-6","citationCount":"3","resultStr":"{\"title\":\"Crown-ether mediated synthesis of FAU- and EMT-type zeolites in the presence of phosphate anions: study of the incorporation of gallium\",\"authors\":\"B. De Witte , J. Patarin , T. Cholley\",\"doi\":\"10.1016/S0927-6513(97)00009-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Syntheses were performed in the system 10SiO<sub>2</sub>:<em>y</em>Al<sub>2</sub>O<sub>3</sub>:(1−<em>y</em>)Ga<sub>2</sub>O<sub>3</sub>:<em>z</em>P<sub>2</sub>O<sub>5</sub>:(2.4−4.1)Na<sub>2</sub>O:0.4(18C-6 or 15C-5):(140−180)H<sub>2</sub>O. For the Si-Al system, the presence of P<sub>2</sub>O<sub>5</sub> allows the crystallization of EMT at high alkalinity, due to the complexation of Al(OH)4/− by phosphate anions. Remarkably, this complexation is less efficient when 18C-6 is replaced by 15C-5, giving FAU phases with low Si/Al ratio. The addition of small amounts of Ga (<em>y</em>=0.05–0.1) leads to intergrowth formation of EMT and FAU. This is ascribed to the preferential location of Ga in the double six-rings which connect the successive FAU sheets. In the absence of P<sub>2</sub>O<sub>5</sub>, Ga is less reactive than Al and will be more homogeneously distributed over the framework. Under these conditions, up to 25% of Al can be substituted by Ga in the EMT structure.</p></div>\",\"PeriodicalId\":100926,\"journal\":{\"name\":\"Microporous Materials\",\"volume\":\"10 4\",\"pages\":\"Pages 189-198\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00009-6\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Microporous Materials\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0927651397000096\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous Materials","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927651397000096","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Crown-ether mediated synthesis of FAU- and EMT-type zeolites in the presence of phosphate anions: study of the incorporation of gallium
Syntheses were performed in the system 10SiO2:yAl2O3:(1−y)Ga2O3:zP2O5:(2.4−4.1)Na2O:0.4(18C-6 or 15C-5):(140−180)H2O. For the Si-Al system, the presence of P2O5 allows the crystallization of EMT at high alkalinity, due to the complexation of Al(OH)4/− by phosphate anions. Remarkably, this complexation is less efficient when 18C-6 is replaced by 15C-5, giving FAU phases with low Si/Al ratio. The addition of small amounts of Ga (y=0.05–0.1) leads to intergrowth formation of EMT and FAU. This is ascribed to the preferential location of Ga in the double six-rings which connect the successive FAU sheets. In the absence of P2O5, Ga is less reactive than Al and will be more homogeneously distributed over the framework. Under these conditions, up to 25% of Al can be substituted by Ga in the EMT structure.
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