金属掺杂纳米固体超强酸SO2-4/ZrO2的IR考察

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Abstract In this paper, ZrO(OH)₂ was prepared with sol-gel method, then a series of metal-ions-doped SO^2-₄/ZrO₂ nanosolid superacids were prepared by impregnated ZrO(OH)₂ using diluted H₂SO₄ and Ni²⁺, Al³⁺, Sn⁴⁺, Ag⁺, Sn²⁺ etc. salt solutions. The samples were characterized by IR, XRD, TEM and chemical analysis method. The result shows that the IR spectra of samples are the characteristic spectra of the solid superacids. The stretching frequencies of Zr—O and SO in Ni²⁺ and Sn⁴⁺ doped samples are obviously increased, the ν_Zr—O values of Zr—O increase from 485 cm^-1 for SO^2-₄/ZrO₂ to 500 cm^-1 for both Ni²⁺ and Sn⁴⁺ doped samples, the ν_as values of SO increase from 1 390 cm^-1 for SO^2-₄/ZrO₂ to 1 405 and 1 400 cm^-1 for Ni²⁺ and Sn⁴⁺ doped samples respectively, but that in Sn²⁺ doped sample increases a little. It is indicated that the samples doped by Ni²⁺ and Sn⁴⁺ show higher super acidity than SO^2-₄/ZrO₂. The IR spectra of samples were determined at different calcination temperatures. It was found that the stretching frequencies of Zr—O and SO in Ni²⁺ and Al³⁺ doped samples are obviously increased with the increase in calcination temperature, but that in Ag⁺ doped sample is not.

Key words：Metal doping;SO^2-₄/ZrO₂;Nanosolid superacid;IR

Received: 2003-09-26 Accepted: 2004-02-10

ZTFLH:

O643.3

Corresponding Authors: JIAN Pan-ming

Cite this article:

JIAN Pan-ming,XU Lin,GAO Qiang, et al. Observation of IR Spectra from Doped SO^2-₄/ZrO₂ Nanosolid Superacid [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(03): 356-359.

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https://www.gpxygpfx.com/EN/Y2005/V25/I03/356