中国电机工程学报2011，Vol.31Issue(35)：41-46,6.
尿素催化水解特性实验研究
Experimental Investigation on the Properties of Urea Thermohydrolysis With Catalysts
陈镇超 1杨卫娟 1周俊虎 1黄镇宇 1岑可法1
作者信息
- 1. 能源清洁利用国家重点实验室（浙江大学）,浙江省杭州市310027
- 折叠
摘要
Abstract
The thermohydrolysis and pyrolysis of urea with and without the catalytic function of ten kind of metal oxides for ammonia were studied under quartz tube reactor and the properties of different oxides as a catalytic bed material for urea hydrolysis were compared. The results show that the water vapor has no effect on the urea decomposition and ammonia （NH3） productive rate keeps about 50%. Most of the ammonia is produced at 133-230 ℃. The added metal oxides significantly improve the urea thermohydrolysis in the presence of water vapor. NH3 is produced at 133-300 ℃ and the productive rate reaches 100%. The hydrolysis of isocyanic acid （HNCO） over different metal oxides was investigated experimentally at 150- 400 ℃ and it is found that the catalytic effect decreases in the order TiO2, γ-Al2O3, zeolites, SiO2. On the catalytic condition, the apparent activation energy of the HNCO hydrolysis reaction is low, which suggests the reaction is mainly controlled by gas-phase mass transfer. Ammonia production from urea solution over metal oxides was investigated in a fluidized bed reactor, which shows that γ-Al2O3 is most suitable as a fluidized bed material due to its high catalytic activity, as well as good abrasion resistance and stability.关键词
尿素/异氰酸/水解/催化/流化床Key words
urea/isocyanic acid/hydrolysis/catalyst/fluidized bed分类
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陈镇超,杨卫娟,周俊虎,黄镇宇,岑可法..尿素催化水解特性实验研究[J].中国电机工程学报,2011,31(35):41-46,6.
