Synthesis,Characterization and Catalysis of New Pillared Anionic Clays by[GaW_(11)O_(39)M(H_(2)O)]^(7-)(M=Mn^(2+),Co^(2+)or Ni^(2+))

作     者：Zhu, Zhi-ping Peng, Wan-pu Zhou, De-feng Liu, Jing-fu 

作者机构：NE Normal Univ Dept Chem Changchun 130024 Peoples R China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：1998年第14卷第3期

页      面：32-36页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

主　　题：Heteropolyanion Intercalation Pillared clay Epoxidation 

摘      要：Pillared anionic clays or layered double hydroxides were prepared by means of hydrothermal ion exchange reaction of [Zn 2Al(OH) 6]NO 3· x H 2O (ZnAl NO 3) with [GaW 11 O 39 M(H 2O)] 7- (abbreviated as GaW 11 M, M=Mn 2+ , Co +2 or Ni 2+ ). The layered compounds were characterized by means of XRD, IR, elemental analysis and DTA. The X ray diffraction and IR spectra show that the new anionic clays synthesized are layered compounds with the gallery heights of 0.99-1.00 nm and the Keggin structure tungstogallic heteropolyanions almost completely replace the interlayer NO - 3, entering the layer and retain their Keggin structure. The DTA gives a thermostability order of ZnAl GaW 11 Ni ZnAl GaW 11 CoZnAl GaW 11 MnZnAl NO 3. The ctalytic tests showed that the new pillared compounds have higher catalytic activities in the cyclooxidation reaction of maleic acid.