Interlayer expansion of the layered zeolite precursor COK-5 with Sn(acac)₂Cl₂

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• 作者：Chaoqun Bian ; Qinming Wu ; Jian Zhang ; Shuxiang Pan ; Liang Wang ; ^{liangwang@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiangju Meng ; Feng-Shou Xiao ; ^{fsxiao@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Interlayer expansion ; COK-5 ; Isolated tin species ; Sn(acac)2Cl2 ; COE-5
• 刊名：Journal of Energy Chemistry
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：24
• 期：5
• 页码：642-645
• 全文大小：998 K

文摘

In the interlayer expansion of the layered zeolite precursor COK-5, a Sn, salt, bis(2,4-pentanedionate)-dichlorotin [Sn(acac)₂Cl₂], instead of a silylating agent was used to link the layers at 180 °C. The obtained material, which is designed as Sn-COE-5, shows a shift of the first XRD reflection, which is very similar to that of COK-5 interlayer expanded with dichlorodimethylsilane (DCDMS), indicating an increase in interlayer distance. X-ray diffraction (XRD), N₂ sorption isotherms, inductively coupled plasma (ICP), and X-ray photoelectron spectroscopy (XPS) support the incorporation of isolated Sn sites in the sample. In the conversion of glucose to levulinic acid, Sn-COE-5 exhibits much higher activity than COK-5, which is due to the presence of Lewis acidic sites in the Sn-COE-5.