{"title":"γ辐照对CuO-Al2O3固体催化活性和选择性的影响","authors":"A.M. Youssef, S.A. El-Hakam, G.A. El-Shobaky","doi":"10.1016/1359-0197(92)90226-6","DOIUrl":null,"url":null,"abstract":"<div><p>CuO-Al<sub>2</sub>O<sub>3</sub> catalyst containing 16.2 wt% CuO, precalcined at 300°C was subjected to different doses of γ-rays ranging between 20 and 160 Mrad. The magnetic properties were measured by the Gouy method and the catalytic activity and selectivity towards isopropanol conversion were investigated using a microcatalytic pulse technique at temperatures between 260–300°C.</p><p>The CuO-Al<sub>2</sub>O<sub>3</sub> system exhibited a lower paramagnetic moment compared to that of unloaded CuO. γ-Irradiation induced changes in the magnetic properties of the system. The presence of diamagnetic alumina as a support and its dehydroxylation with γ-rays contributed to the observed changes in the magnetic properties.</p><p>Loading of CuO on alumina decreased the dehydration activity which disappeared completely at 16.2 wt% CuO. γ-Irradiation resulted in a progressive decrease in the dehydrogenation activity falling to a minimum at a dose of 40 Mrad. At greater doses the activity increased with the increase of the irradiation dose. Unirradiated and 160 Mrad-irradiated samples measured more or less the same dehydrogenation activity.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 575-578"},"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)90226-6","citationCount":"3","resultStr":"{\"title\":\"Effect of gamma-irradiation on catalytic activity and selectivity of CuO-Al2O3 solids\",\"authors\":\"A.M. Youssef, S.A. El-Hakam, G.A. El-Shobaky\",\"doi\":\"10.1016/1359-0197(92)90226-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>CuO-Al<sub>2</sub>O<sub>3</sub> catalyst containing 16.2 wt% CuO, precalcined at 300°C was subjected to different doses of γ-rays ranging between 20 and 160 Mrad. The magnetic properties were measured by the Gouy method and the catalytic activity and selectivity towards isopropanol conversion were investigated using a microcatalytic pulse technique at temperatures between 260–300°C.</p><p>The CuO-Al<sub>2</sub>O<sub>3</sub> system exhibited a lower paramagnetic moment compared to that of unloaded CuO. γ-Irradiation induced changes in the magnetic properties of the system. The presence of diamagnetic alumina as a support and its dehydroxylation with γ-rays contributed to the observed changes in the magnetic properties.</p><p>Loading of CuO on alumina decreased the dehydration activity which disappeared completely at 16.2 wt% CuO. γ-Irradiation resulted in a progressive decrease in the dehydrogenation activity falling to a minimum at a dose of 40 Mrad. At greater doses the activity increased with the increase of the irradiation dose. Unirradiated and 160 Mrad-irradiated samples measured more or less the same dehydrogenation activity.</p></div>\",\"PeriodicalId\":14262,\"journal\":{\"name\":\"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry\",\"volume\":\"40 6\",\"pages\":\"Pages 575-578\"},\"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)90226-6\",\"citationCount\":\"3\",\"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/1359019792902266\",\"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/1359019792902266","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effect of gamma-irradiation on catalytic activity and selectivity of CuO-Al2O3 solids
CuO-Al2O3 catalyst containing 16.2 wt% CuO, precalcined at 300°C was subjected to different doses of γ-rays ranging between 20 and 160 Mrad. The magnetic properties were measured by the Gouy method and the catalytic activity and selectivity towards isopropanol conversion were investigated using a microcatalytic pulse technique at temperatures between 260–300°C.
The CuO-Al2O3 system exhibited a lower paramagnetic moment compared to that of unloaded CuO. γ-Irradiation induced changes in the magnetic properties of the system. The presence of diamagnetic alumina as a support and its dehydroxylation with γ-rays contributed to the observed changes in the magnetic properties.
Loading of CuO on alumina decreased the dehydration activity which disappeared completely at 16.2 wt% CuO. γ-Irradiation resulted in a progressive decrease in the dehydrogenation activity falling to a minimum at a dose of 40 Mrad. At greater doses the activity increased with the increase of the irradiation dose. Unirradiated and 160 Mrad-irradiated samples measured more or less the same dehydrogenation activity.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
