Ankica Čižmek , Boris Subotica , Damir Kralj , Vesna Babić-Ivančić , Anton Tonejc
{"title":"凝胶性质对mfi型沸石结晶动力学和颗粒性质的影响。1 .凝胶老化时间和温度对硅石-1微晶颗粒性能的影响","authors":"Ankica Čižmek , Boris Subotica , Damir Kralj , Vesna Babić-Ivančić , Anton Tonejc","doi":"10.1016/S0927-6513(97)00075-8","DOIUrl":null,"url":null,"abstract":"<div><p>The influence of time and temperature of ageing of the amorphous gel precursor (2.5Na<sub>2</sub>O-8TPABr-60SiO<sub>2</sub>-800H<sub>2</sub>O) on the particulate properties (particle size distribution, particle shape, number of particles) of silicalite-1 synthesized at 170°C were studied by different experimental methods such as X-ray diffractometry (XRD), differential thermogravimetric analysis (TGA), particle size analysis, FT infra-red spectroscopy and scanning-electron microscopy (SEM). In spite of negligible changes in the crystal morphology, ageing of the gel considerably affects the number and size of silicalite-1 crystals in the crystalline end products. The observed effects were discussed in terms of the formation of specific ordered subunits between silicate species and TPA<sup>+</sup> ions (germ nuclei) and their role in the nucleation and crystal growth of silicalite-1 crystals.</p></div>","PeriodicalId":100926,"journal":{"name":"Microporous Materials","volume":"12 4","pages":"Pages 267-280"},"PeriodicalIF":0.0000,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00075-8","citationCount":"28","resultStr":"{\"title\":\"The influence of gel properties on the kinetics of crystallization and particulate properties of MFI-type zeolities. I. The influence of time and temperature of gel ageing on the particulate properties of silicalite-1 microcrystals\",\"authors\":\"Ankica Čižmek , Boris Subotica , Damir Kralj , Vesna Babić-Ivančić , Anton Tonejc\",\"doi\":\"10.1016/S0927-6513(97)00075-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The influence of time and temperature of ageing of the amorphous gel precursor (2.5Na<sub>2</sub>O-8TPABr-60SiO<sub>2</sub>-800H<sub>2</sub>O) on the particulate properties (particle size distribution, particle shape, number of particles) of silicalite-1 synthesized at 170°C were studied by different experimental methods such as X-ray diffractometry (XRD), differential thermogravimetric analysis (TGA), particle size analysis, FT infra-red spectroscopy and scanning-electron microscopy (SEM). In spite of negligible changes in the crystal morphology, ageing of the gel considerably affects the number and size of silicalite-1 crystals in the crystalline end products. The observed effects were discussed in terms of the formation of specific ordered subunits between silicate species and TPA<sup>+</sup> ions (germ nuclei) and their role in the nucleation and crystal growth of silicalite-1 crystals.</p></div>\",\"PeriodicalId\":100926,\"journal\":{\"name\":\"Microporous Materials\",\"volume\":\"12 4\",\"pages\":\"Pages 267-280\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00075-8\",\"citationCount\":\"28\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Microporous Materials\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0927651397000758\",\"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/S0927651397000758","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The influence of gel properties on the kinetics of crystallization and particulate properties of MFI-type zeolities. I. The influence of time and temperature of gel ageing on the particulate properties of silicalite-1 microcrystals
The influence of time and temperature of ageing of the amorphous gel precursor (2.5Na2O-8TPABr-60SiO2-800H2O) on the particulate properties (particle size distribution, particle shape, number of particles) of silicalite-1 synthesized at 170°C were studied by different experimental methods such as X-ray diffractometry (XRD), differential thermogravimetric analysis (TGA), particle size analysis, FT infra-red spectroscopy and scanning-electron microscopy (SEM). In spite of negligible changes in the crystal morphology, ageing of the gel considerably affects the number and size of silicalite-1 crystals in the crystalline end products. The observed effects were discussed in terms of the formation of specific ordered subunits between silicate species and TPA+ ions (germ nuclei) and their role in the nucleation and crystal growth of silicalite-1 crystals.
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