Acta Chimica Sinica ›› 1996, Vol. 54 ›› Issue (4): 357-362. Previous Articles     Next Articles

Original Articles

杂多阴离子柱撑水滑石的合成、热稳定性、酸碱性研究

郭军;娇庆泽;沈剑平;吕慧娟;刘丹;蒋大振;闵恩泽   

  1. 吉林大学化学系;石油化工科学研究院
  • 出版日期:1996-04-15 发布日期:1996-04-15

Studies on synthesis, thermal stabilities and acid-base properties of heteropolyanions pillared layered double hydroxides

GAO JUN;JIAO QINGZE;SHEN JIANPING;LU HUJIUAN;LIU DAN;JIANG DAZHEN;MIN ENZE   

  • Online:1996-04-15 Published:1996-04-15

Layered Double Hydroxides (LDHs) pillared with heteropolyanions (POMs) SiW11M(H2O)O39^6^-, were synthesized by direct anion exchange reactions in aqueous solution, and were characterized by elemental analysis, XRD and IR spectra. The XRD patterns give the d (oo1) value of 1.47nm. Differential thermal analysis (DTA) combined with XRD and IR studies of samples calcined at different temperatures indicates that the thermal decomposition of the samples takes place in three steps: the elimination of water molecules from the interlayer space (less than 250℃); the elimination of hydroxyl groups from the brucite-like layers (between 400~500℃), then amorphous materials are obtained, which crystallize upon calcination at temperature higher than 600℃. The results from isopropanol conversion show that the pillared products are more catalytically active than that of the LDH procursor and the corresponding K^+ salts of the POMs, and there exists two kinds of active sites (acid and base sites) on the surface of the samples.

Key words: INFRARED SPECTROPHOTOMETRY, HETEROPOLYACID, COBALT COMPOUNDS, ELEMENTAL ANALYSIS, X-RAY DIFFRACTION ANALYSIS, THERMAL STABILITY, SILICIC ACID P, NICKEL COMPOUNDS, ZINC COMPOUNDS, IRON COMPOUNDS

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