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

Abstract

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

CLC Number:

O643

Cite this article

HU CHANGWEN;LIU YANYONG;WANG ZUOPING;WANG ENBO. Synthesis, characterization and catalysis of a new type of microporous material-XW11Co-pillared Zn-Al type layered double hydroxides[J]. Acta Chimica Sinica, 1997, 55(1): 49-55.

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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