{"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}
引用次数: 41
Abstract
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.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
