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인산 또는 붕산으로 변화시킨 ZrO2 촉매의 특성
Characterization of ZrO2 Catalyst Modified with Phosphoric Acid or Boric Acid
HWAHAK KONGHAK, June 1989, 27(3), 309-314(6), NONE
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Abstract
ZrOCl2 용액으로부터 Zr(OH)4 침전물을 만들고 이어서 인산이나 불산으로 표면을 변화시켜 ZrO2/PO4-3 및 ZrO3/BO3-3 촉매를 각각 제조하였다. 이들 촉매의 특성을 적외선 spectra, X-선 회절 및 시차열분석으로 조사하였다. 그 결과 순수한 ZrO2에 비하여 산으로 표면이 변화된 ZrO2 촉매는 무정형에서 tetragonal phase로 전이되는 온도가 150-200℃ 정도 높았으며 비표면적도 약 40-50㎡/g 정도 증가하였다. 그리고 산의 세기도 Ho scale로 2. 6-5. 2 단위 증가하였다.
ZrO2/PO4-3 and ZrO2/BO3-3 catalysts were prepared by precipitation from the solution of zirconium oxychloride followed by modification with phosphoric acid and boric acid, respectively. The characterization of prepared catalysts was examined by infrared spectra, X-ray diffraction and differential thermal analysis. On the basis of the results obtained from X-ray diffraction and DTA for ZrO2 modified with acids, the transition temperature from amorphous to tetragonal phase was high by 150-200℃ and the specific surface increased by about 40-50m2/g, as compared with pure ZrO2. The acid strength of modified catalysts increased by 2.6-5.2 unit as Ho scale.
