Attempts to create new shape-selective solid strong base catalysts

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• 作者：Zhu ; Jianhua ; Chun ; Yuan ; Wang ; Ying ; Xu ; Qinhua
• 关键词：Strongly basic zeolite ; KF modification ; Loading of KNO₃ ; Dispersion of MgO ; Microwave irradiation
• 刊名：Catalysis Today
• 出版年：1999
• 出版时间：June 1, 1999
• 年：1999
• 卷：51
• 期：1
• 页码：103-111
• 全文大小：162 K

文摘

Loading of KF on zeolite NaY leads to a similar basicity to that of KOH/NaY, but no strongly basic sites formed on the composite due to the negative effect of SiO₄ tetrahedra in NaY which form species with low base strength. Using AlPO₄-5 or NaY coated with Al₂O₃ to support KF could avoid the effect of SiO₄ tetrahedra and increased the base strength of the sample. KNO₃ loaded on NaY created basic sites after decomposition at 673 K with a redox method, and KNO₃/KL was found to have superbasicity. For preparation of strongly basic zeolites, microwave irradiation was employed to disperse MgO on zeolites, and the resulting materials showed high activities in the decomposition of isopropanol or the isomerization of cis-but-2-ene at 273 K.