Cu(OH)_2のDTAによる脱水過程

概要

論文の詳細を見る
The thermal dehydration of Cu(OH)_2 has been studied by many investigators. The reported DTA curves were not in good agreement and the dehydration process was not investigated in detail. In this study the thermal dehydration process of Cu(OH)_2 under CO_2,N_2,Air and reduced pressure has been investigated in ditail by means of DTA, TG, DSC, X-ray and surface area measurement. The heat of the dehydration and the activation energy on the dehydration of Cu(OH)_2 were calculated by various method and these values were compared each other. The dehydration temperature of Cu(OH)_2 was 157℃ under atmosphere N_2,760mmHg. The DTA of Cu(OH)_2 has not been studied under N_2,CO_2 and reduced pressure. The DTA of Cu(OH)_2 under various pressure (760mmHg→5mmHg) was measured and the dehydration temperature was gradually shifted to lower temperature with decreasing pressure. A new exothermic peak appeared at 230℃ after the endothermic peak. This exothermic peak has not been reported. This peak hight became to maximum under the pressure of 460mmHg and became smaller with decreasing pressure and then disappeared under the pressure of 5mmHg. This peak was considered to be due to the crystalization of CuO on the result of X-ray analysis. The activation energy on the dehydration of Cu(OH)_2 were calculated 11.1 kcal/mole by using the DTA method, 9. 9 kcal/mole by the TG method and the heat of the dehydration of Cu(OH)_2 were calculated 14.8 kcal/mole by the DTA method, 11.4 kcal/mole by the DSC method. The specific surface area and the particle size of Cu(OH)_2 mesuared by using the BET technique were 34m^2/g, 250Å respectively. The specific surface area was increased with proceeding the decomposition reaction. This specific surface area became to maximum value, 103m^2/g at decomposition rate 90% and decreased to 66 m^2/g at decomposition rate, 100%. The particle size was decreased with the proceeding decomposition rate and this particle size became to minimum value, 46 Å at decomposition rate, 90%.
岡山理科大学の論文

Cu(OH)_2のDTAによる脱水過程

スポンサーリンク

概要

著者

関連論文

スポンサーリンク