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황산이온으로 표면처리된 ZrO2와 NiO-ZrO2의 특성
Properties of ZrO2 and NiO-ZrO2 Modified with Sulfate Ion
HWAHAK KONGHAK, December 1986, 24(6), 521-528(8), NONE
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Abstract
침전물을 황산으로 처리함으로 ZrO2/SO42- 와 NiO-ZrO2/SO42- 을 제조하였다. Zr（OH）4 표면에 흡착된 황산이온의 적외선 스펙트라를 관찰한 결과, 황산이온은 표면수산기를 치환하여 결합을 형성하였으며 C2v대칭을 이루었다. X-선 회절과 DTA 결과에 의하면 황산이온으로 처리된 ZrO2는 무정형에서 tetragonal phase로 되는 전이온도가 순수한 ZrO2에 비하여 200 ℃정도 높았다. 그리고 NiO-ZrO2 경우에는 NiO가 ZrO2에 용해됨으로 말미암아 역시 ZrO2의 상전이온도가 높은 온도쪽으로 이동하였다. 결합된 황산이온은 NiO의 함량에 따라 다르게 700-840 ℃에서 분해되어 SO3로 방출되었다.
ZrO2/SO4-2 and NiO-ZrO2/SO4-2 were prepared by precipitation followed by modification with H2SO4. Infrared spectra of sulfate adsorbed on Zr（OH）4 showed replacement of surface hydroxyls and the formation of adsorbed sulfate groups with C2ν symmetry. On the basis of the results obtained from X-ray diffraction and DTA for ZrO2 modified with sulfate ion, the transition temperature from amorphous to tetragonal phase was as high as 200 ℃, as Comared with pure ZrO2. For NiO-ZrO2, the phase transition temperature shifted to higher temperature due to the solubility of NiO in the ZrO2. The sulfate ion adsorbed on the surface was decomposed to release SO3 at 700-840 ℃ differently depending on the NiO content.
