{"title":"γ辐照和锂掺杂对镍铝混合氧化物催化活性的影响","authors":"G.A. El-Shobaky, A.N. Al-Noaimi, A.M. Dessouki","doi":"10.1016/0376-4583(85)90003-2","DOIUrl":null,"url":null,"abstract":"<div><p>The catalytic activity of pure NiO and Ni-Al mixed oxides subjected to various doses of γ irradiation was investigated using the oxidation of CO with O<sub>2</sub> at various temperatures. The effect of lithium doping on the catalytic activity of Ni-Al was also investigated. The results obtained revealed that γ irradiation of pure NiO using doses up to 10 Mrad effected a decrease of 45% in its catalytic activity which suffered a further slight change when the dose was increased to 20 Mrad. The activity of Ni-Al mixed oxide was modified in a somewhat complicated manner by γ irradiation. Doses of 5 – 10 Mrad produced an increase of 34% in its catalytic activity and a dose of 15 Mrad caused a drastic decrease in its activity of 57%. Increasing the dose of 20 Mrad produced a slight increase in the catalytic activity of the mixed oxide solid.</p><p>The modifications in the catalytic activity of pure NiO and mixed oxide solids arising from γ irradiation were attributed to an induced removal of chemisorbed O<sub>2</sub> in the case of pure NiO and to a possible increase in the [Ni]/[Al] ratio, especially in the outermost surface layers, of the mixed oxide catalyst.</p><p>Lithium doping was found to cause a significant increase in the catalytic activity of Ni-Al mixed oxide which was attributed to the increase in the amount of chemisorbed O<sub>2</sub> and to an increase in the [Ni]/[Al] ratio.</p></div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90003-2","citationCount":"36","resultStr":"{\"title\":\"Effects of γ irradiation and lithium doping on the catalytic activity of nickel-aluminum mixed oxides\",\"authors\":\"G.A. El-Shobaky, A.N. Al-Noaimi, A.M. Dessouki\",\"doi\":\"10.1016/0376-4583(85)90003-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The catalytic activity of pure NiO and Ni-Al mixed oxides subjected to various doses of γ irradiation was investigated using the oxidation of CO with O<sub>2</sub> at various temperatures. The effect of lithium doping on the catalytic activity of Ni-Al was also investigated. The results obtained revealed that γ irradiation of pure NiO using doses up to 10 Mrad effected a decrease of 45% in its catalytic activity which suffered a further slight change when the dose was increased to 20 Mrad. The activity of Ni-Al mixed oxide was modified in a somewhat complicated manner by γ irradiation. Doses of 5 – 10 Mrad produced an increase of 34% in its catalytic activity and a dose of 15 Mrad caused a drastic decrease in its activity of 57%. Increasing the dose of 20 Mrad produced a slight increase in the catalytic activity of the mixed oxide solid.</p><p>The modifications in the catalytic activity of pure NiO and mixed oxide solids arising from γ irradiation were attributed to an induced removal of chemisorbed O<sub>2</sub> in the case of pure NiO and to a possible increase in the [Ni]/[Al] ratio, especially in the outermost surface layers, of the mixed oxide catalyst.</p><p>Lithium doping was found to cause a significant increase in the catalytic activity of Ni-Al mixed oxide which was attributed to the increase in the amount of chemisorbed O<sub>2</sub> and to an increase in the [Ni]/[Al] ratio.</p></div>\",\"PeriodicalId\":22037,\"journal\":{\"name\":\"Surface Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1985-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0376-4583(85)90003-2\",\"citationCount\":\"36\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Surface Technology\",\"FirstCategoryId\":\"1087\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0376458385900032\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Technology","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0376458385900032","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effects of γ irradiation and lithium doping on the catalytic activity of nickel-aluminum mixed oxides
The catalytic activity of pure NiO and Ni-Al mixed oxides subjected to various doses of γ irradiation was investigated using the oxidation of CO with O2 at various temperatures. The effect of lithium doping on the catalytic activity of Ni-Al was also investigated. The results obtained revealed that γ irradiation of pure NiO using doses up to 10 Mrad effected a decrease of 45% in its catalytic activity which suffered a further slight change when the dose was increased to 20 Mrad. The activity of Ni-Al mixed oxide was modified in a somewhat complicated manner by γ irradiation. Doses of 5 – 10 Mrad produced an increase of 34% in its catalytic activity and a dose of 15 Mrad caused a drastic decrease in its activity of 57%. Increasing the dose of 20 Mrad produced a slight increase in the catalytic activity of the mixed oxide solid.
The modifications in the catalytic activity of pure NiO and mixed oxide solids arising from γ irradiation were attributed to an induced removal of chemisorbed O2 in the case of pure NiO and to a possible increase in the [Ni]/[Al] ratio, especially in the outermost surface layers, of the mixed oxide catalyst.
Lithium doping was found to cause a significant increase in the catalytic activity of Ni-Al mixed oxide which was attributed to the increase in the amount of chemisorbed O2 and to an increase in the [Ni]/[Al] ratio.