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化学学报
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化学学报 ›› 1997, Vol. 55 ›› Issue (1): 49-55. 上一篇    下一篇

研究论文

新型层柱微孔材料-XW11Co柱撑Zn-Al型层柱化合物的合成、表征及催化活性研究

胡长文;刘彦勇;王作屏;王恩波   

  1. 东北师范大学化学系
  • 发布日期:1997-01-15

Synthesis, characterization and catalysis of a new type of microporous material-XW11Co-pillared Zn-Al type layered double hydroxides

HU CHANGWEN;LIU YANYONG;WANG ZUOPING;WANG ENBO   

  • Published:1997-01-15

PDF

683

被引次数

22

采用水热合成与离子交换方法, 将中心原子不同的过渡金属(Co^2^+)取代型Keggin结构杂多阴离子XW11O39Co(H2O)^n^-(X=Ge^4^+, B^3^+和Co^2^+)嵌入Zn-Al型阴离子粘土层间, 合成了底面间距(d001)为1.46±0.01nm的新型层柱化合物Zn2Al-GeW11Co, Zn2Al-BW11Co和Zn2Al-CoW11Co; 通过XRD, IR, XPS和DTA等手段, 研究了它们的结构与性质, 推测了这些杂多阴离子(XW11Co)在层间的空间取向; 考察了这些新型层柱化合物对乙酸与n-丁醇酯化反应的催化活性; 吡啶吸附IR光谱研究结果表明, 它们同时具有B酸与L酸两种酸中心。

关键词: 红外分光光度法, 杂多酸, Ｘ射线衍射分析, 丁醇, Ｘ射线光电子谱法, 乙酸, 差热分析, 催化活性, 酯化反应, KEGGIN结构

The heteropolyoxometalate, XW11O39Co(H2O)^n^- (X=Ge^4^+, B^3^+, and Co^2^+) having Keggin structure is intercalated into the interlayer space of Zn-Al type layered double hydroxide via both hydrothermal reaction and ion exchange reaction, and a new type of pillared layered microporous compounds, Zn2Al-GeW11Co, Zn2Al-BW11Co and Zn2Al-CoW11Co with higher basal space (d001=1.46±0.01nm) have been obtained. The structure and properties of the new compounds were studied by XRD, IR spectra, XPS and DTA. The orientation of the intercalated anions XW11Co was deduced. Catalytic activity of those new compounds for esterification of acetic acid with n-butanol was also studied. It was found that the catalytic activity is higher than HY. Their IR spectra of pyridine adsorption indicated the new compounds possess both B-acid centre and L-acid centre.

Key words: INFRARED SPECTROPHOTOMETRY, HETEROPOLYACID, X-RAY DIFFRACTION ANALYSIS, BUTANOL, X-RAY PHOTOELECTRON SPECTROMETRY, ACETIC ACID, DIFFERENTIAL THERMAL ANALYSIS, CATALYTIC ACTIVITY, REACTION KINETICS FOR THE ESTERIFICATION

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