{"title":"加碱沸石X上1-丁烯异构化反应中二氧化碳碱性位的IR和TPD研究","authors":"Fuyuki Yagi, Hideto Tsuji, Hideshi Hattori","doi":"10.1016/S0927-6513(96)00114-9","DOIUrl":null,"url":null,"abstract":"<div><p>The basic zeolites X which contain alkalis (K, Rb, Cs) in excess of the ion-exchange capacity (alkali-added zeolite X) showed an activity for 1-butene isomerization at 273 K, whereas alkali ion-exchanged zeolite X showed almost no such activity. The activities of the different alkali-added zeolites were in the following order: Cs-added zeolite X > Rb-added zeolite X > K-added zeolite X ≫ Na-added zeolite X. Temperature-programmed desorption (TPD) of adsorbed CO<sub>2</sub> showed that the amounts of adsorbed CO<sub>2</sub> were several times larger for alkali-added zeolites X than for alkali ion-exchanged zeolites X.</p><p>The poisoning experiment with CO<sub>2</sub> indicated that the active sites of alkali-added zeolites X are so basic that they retain CO<sub>2</sub> against evacuation at 573 K. The state of CO<sub>2</sub> adsorbed on the active sites was identified to be bidentate carbonate by IR study.</p></div>","PeriodicalId":100926,"journal":{"name":"Microporous Materials","volume":"9 5","pages":"Pages 237-245"},"PeriodicalIF":0.0000,"publicationDate":"1997-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0927-6513(96)00114-9","citationCount":"41","resultStr":"{\"title\":\"IR and TPD (temperature-programmed desorption) studies of carbon dioxide on basic site active for 1-butene isomerization on alkali-added zeolite X\",\"authors\":\"Fuyuki Yagi, Hideto Tsuji, Hideshi Hattori\",\"doi\":\"10.1016/S0927-6513(96)00114-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The basic zeolites X which contain alkalis (K, Rb, Cs) in excess of the ion-exchange capacity (alkali-added zeolite X) showed an activity for 1-butene isomerization at 273 K, whereas alkali ion-exchanged zeolite X showed almost no such activity. The activities of the different alkali-added zeolites were in the following order: Cs-added zeolite X > Rb-added zeolite X > K-added zeolite X ≫ Na-added zeolite X. Temperature-programmed desorption (TPD) of adsorbed CO<sub>2</sub> showed that the amounts of adsorbed CO<sub>2</sub> were several times larger for alkali-added zeolites X than for alkali ion-exchanged zeolites X.</p><p>The poisoning experiment with CO<sub>2</sub> indicated that the active sites of alkali-added zeolites X are so basic that they retain CO<sub>2</sub> against evacuation at 573 K. The state of CO<sub>2</sub> adsorbed on the active sites was identified to be bidentate carbonate by IR study.</p></div>\",\"PeriodicalId\":100926,\"journal\":{\"name\":\"Microporous Materials\",\"volume\":\"9 5\",\"pages\":\"Pages 237-245\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-05-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S0927-6513(96)00114-9\",\"citationCount\":\"41\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Microporous Materials\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0927651396001149\",\"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/S0927651396001149","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
IR and TPD (temperature-programmed desorption) studies of carbon dioxide on basic site active for 1-butene isomerization on alkali-added zeolite X
The basic zeolites X which contain alkalis (K, Rb, Cs) in excess of the ion-exchange capacity (alkali-added zeolite X) showed an activity for 1-butene isomerization at 273 K, whereas alkali ion-exchanged zeolite X showed almost no such activity. The activities of the different alkali-added zeolites were in the following order: Cs-added zeolite X > Rb-added zeolite X > K-added zeolite X ≫ Na-added zeolite X. Temperature-programmed desorption (TPD) of adsorbed CO2 showed that the amounts of adsorbed CO2 were several times larger for alkali-added zeolites X than for alkali ion-exchanged zeolites X.
The poisoning experiment with CO2 indicated that the active sites of alkali-added zeolites X are so basic that they retain CO2 against evacuation at 573 K. The state of CO2 adsorbed on the active sites was identified to be bidentate carbonate by IR study.
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