{"title":"γ射线辐照对SiO2-Al2O3和li2o -浸渍SiO2-Al2O3体系表面和催化性能的影响","authors":"A.M. Youssef , M.A. El Kherbawy , S.E. Samra","doi":"10.1016/1359-0197(92)90224-4","DOIUrl":null,"url":null,"abstract":"<div><p>Coprecipitated SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> (Al<sub>2</sub>O<sub>3</sub>=33.2 mol%) and Li<sub>2</sub>O-impregnated SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> containing 1, 2.5 and 5 mol% Li<sub>2</sub>O were prepared. The textural properties were determined by following the adsorption of nitrogen at 77K. The surface acidities were determined from pyridine adsorption at 423 K. The catalytic conversion of isopropanol on the catalyst prepared was carried out using the pulse microcatalytic technique.</p><p>The surface area decreased and the pore size increased upon irradiation with γ-rays (dose⩾ 30 M rad). The acidity decreased upon impregnation with Li<sub>2</sub>O and/or irradiation with γ-rays.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 559-563"},"PeriodicalIF":0.0000,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90224-4","citationCount":"2","resultStr":"{\"title\":\"Effect of irradiation with gamma-rays on the surface and catalytic properties of SiO2-Al2O3 and Li2O-impregnated SiO2-Al2O3 systems\",\"authors\":\"A.M. Youssef , M.A. El Kherbawy , S.E. Samra\",\"doi\":\"10.1016/1359-0197(92)90224-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Coprecipitated SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> (Al<sub>2</sub>O<sub>3</sub>=33.2 mol%) and Li<sub>2</sub>O-impregnated SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> containing 1, 2.5 and 5 mol% Li<sub>2</sub>O were prepared. The textural properties were determined by following the adsorption of nitrogen at 77K. The surface acidities were determined from pyridine adsorption at 423 K. The catalytic conversion of isopropanol on the catalyst prepared was carried out using the pulse microcatalytic technique.</p><p>The surface area decreased and the pore size increased upon irradiation with γ-rays (dose⩾ 30 M rad). The acidity decreased upon impregnation with Li<sub>2</sub>O and/or irradiation with γ-rays.</p></div>\",\"PeriodicalId\":14262,\"journal\":{\"name\":\"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry\",\"volume\":\"40 6\",\"pages\":\"Pages 559-563\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1992-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/1359-0197(92)90224-4\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/1359019792902244\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/1359019792902244","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
摘要
制备了共沉淀型SiO2-Al2O3 (Al2O3=33.2 mol%)和Li2O浸渍型SiO2-Al2O3 (Li2O = 1、2.5和5 mol%)。通过在77K下对氮气的吸附来测定其织构性能。在423 K时，用吡啶吸附法测定了表面酸度。采用脉冲微催化技术对所制备的催化剂进行了异丙醇的催化转化。在γ射线照射(剂量大于或等于30 M rad)后，表面面积减少，孔径增加。用Li2O浸渍和(或)γ射线辐照后，酸度下降。
Effect of irradiation with gamma-rays on the surface and catalytic properties of SiO2-Al2O3 and Li2O-impregnated SiO2-Al2O3 systems
Coprecipitated SiO2-Al2O3 (Al2O3=33.2 mol%) and Li2O-impregnated SiO2-Al2O3 containing 1, 2.5 and 5 mol% Li2O were prepared. The textural properties were determined by following the adsorption of nitrogen at 77K. The surface acidities were determined from pyridine adsorption at 423 K. The catalytic conversion of isopropanol on the catalyst prepared was carried out using the pulse microcatalytic technique.
The surface area decreased and the pore size increased upon irradiation with γ-rays (dose⩾ 30 M rad). The acidity decreased upon impregnation with Li2O and/or irradiation with γ-rays.
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