Hidroksida Berlapis Ganda ZnCrCI: Kesan Haba Terhadap Luas Perm.ukaan dan Keliangan
ZnCrCI layered double hydroxides, with Zn/Cr ratios (R) 3 and 4 were prepared by a coprecipitation method and heat treated samples were subsequently prepared. Their bulk structure was investigated by X-ray diffraction and surface area techniques. X-ray diffraction analysis showed that the layered d...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
1996
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3225/1/Hidroksida_Berlapis_Ganda_ZnCrCI_Kesan_Haba.pdf http://psasir.upm.edu.my/id/eprint/3225/ |
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| Summary: | ZnCrCI layered double hydroxides, with Zn/Cr ratios (R) 3 and 4 were prepared by a coprecipitation method and heat treated samples were subsequently prepared. Their bulk structure was investigated by X-ray diffraction and surface area techniques. X-ray diffraction analysis showed
that the layered double hydroxide phase remained unchanged upon heating up to 250°C for 5 h in an oven at atmospheric pressure. However, new phases, namely spinel-like and ZnO phases appeared when the samples were heated at 350°C and above for the same duration. The specific surface areas decreased with increasing temperature (between 450850°
C) for both R values but no trend was observed for temperatures between 250-350°C. Average pore diameter was found to be optimum at 550°C and 450°C for R = 3 and 4, respectively. |
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