{"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}
引用次数: 2
Abstract
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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