Incorporation of Silver Atoms into the Vacant T-Atom Sites of the Framework of SiBEA Zeolite as Mononuclear Ag(I) Evidenced by XRD, FTIR, NMR, DR UV-vis, XPS, and TPR
Incorporation of Silver Atoms into the Vacant T-Atom Sites of the Framework of SiBEA Zeolite as Mononuclear Ag(I) Evidenced by XRD, FTIR, NMR, DR UV-vis, XPS, and TPR
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DOI：
10.1021/jp401849e
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发表时间：
2013-06-20
影响因子：
3.7
通讯作者：
Kyriienko, Pavlo
中科院分区：
文献类型：
--
作者：
Dzwigaj, Stanislaw;Millot, Yannick;Kyriienko, Pavlo
采用两步后合成法制备了AgSiBEA沸石，首先用硝酸处理TEABEA沸石，生成带有硅醇基团的T原子空位，然后用AgNO3水溶液浸渍生成的SiBEA沸石。用X射线衍射仪、核磁共振、红外光谱、漫反射UV-Vis、XPS和TPR等手段，证明了银离子以单核银(I)的形式进入了SiBEA沸石骨架的T空位。用FTIR研究了Albea的B酸和Lewis酸对羟基的消耗。通过吸附吡啶和CO作为探针分子的FTIR光谱鉴定了SiBEA和AgSiBEA。
An AgSiBEA zeolite has been prepared by a two-step postsynthesis procedure that consists of first creating the vacant T atom sites with associated silanol groups by treatment of TEABEA zeolite with nitric acid and then impregnating of resulting SiBEA zeolite with an aqueous solution of AgNO3. The incorporation of Ag ions into the vacant T atom sites of the framework of SiBEA zeolite as mononuclear Ag(I) has been evidenced by combined use of XRD, NMR, FTIR, diffuse reflectance UV-vis, XPS, and TPR The consumption of OH groups has been monitored by FTIR The Bronsted and Lewis acidities of AlBEA. SiBEA, and AgSiBEA have been identified by FTIR spectroscopy of adsorbed pyridine and CO as probe molecules.