三水铝石
勃姆石
热分解
活化能
分解
化学
等温过程
吸附
水蒸气
动力学
水蒸汽压
热力学
氢氧化物
大气温度范围
化学分解
分析化学(期刊)
无机化学
物理化学
铝
有机化学
物理
量子力学
作者
Lawrence Candela,D. D. Perlmutter
出处
期刊:Aiche Journal
[Wiley]
日期:1986-09-01
卷期号:32 (9): 1532-1545
被引量:29
标识
DOI:10.1002/aic.690320914
摘要
Abstract The isothermal decomposition of gibbsite (aluminum hydroxide) was studied under controlled, pure water vapor pressures from 50 to 3,000 Pa over the temperature range from 458 to 508 K; the effect of sample particle size was also investigated. The partial conversion to boehmite (AlOOH) and the subsequent formation of a ρ‐transition alumina product phase were followed with respect to the reactor operating conditions. Nitrogen and water vapor adsorption measurements were used to evaluate the chemical kinetics of the formation of ρ‐alumina in terms of an interface velocity, and to interpret the observed dependencies on temperature and water vapor pressure. An adsorption/decomposition model is presented for these kinetics. The interpretation is consistent with the observation that decomposition rate is inversely proportional to the square of the water vapor pressure. The apparent activation energy of 342 ± 15 kJ/mol includes a water adsorption energy, as well as the chemical decomposition contribution of 260 ± 20 kJ/mol.
科研通智能强力驱动
Strongly Powered by AbleSci AI