摘要
研究了Ｎｉ－ ３催化剂分解氨的动力学。考察了各种反应条件如温度、空速以及气体中的氨和氢的浓度对反应的影响，确立了氨催化分解动力学方程式。当操作空速为３０００ｈ－ １ 时，在５８０ ～６３０℃的温度区间内，反应主要受化学反应控制；在６３０～７００℃的温度区间内，反应受扩散影响较为严重；在７００℃以上的温度区间内，反应在一定程度上受平衡的影响。随着空速的增大反应速率增大，但转化率却有所减小；气体中氨浓度的增大对反应转化率没有什么影响，氢浓度的增大使反应转化率明显减小。在５８０～６３０℃的温度范围内，空速３０００ｈ－ １ 的操作条件下动力学方程式如下：Ｒ＝ ３．４２３×１０１３ｅ－ ２７６ ．４５ ×１０３ＲＴ ＣＮＨ３·Ｃ－
In this article the results of further research work about Ni - 3 catalyst screened for ammonia catalytic decomposition are reported- The effects of various reaction conditions such asreaction temperature,space velocity and the concentration ofreactants on reaction have been studied- The conversion ofammonia decomposition increases with increas ing reactiontemperaturein a certaintemperaturerange- Underthespace velocity of3000h -1 , when the reaction temperature is from 580 ℃to 630 ℃,the reaction rate is controlled by chemicalreaction , While it is affected by diffusion in temperature ranging from 630 ℃to 700℃- Above 700 ℃the reaction is influenced by reaction equilibrium to a certain extent- Withincreasing space velocity,reaction rate increases while the conversion decreases- The concentration ofammoniain gas has no effecton conversion ,whileincreasing concentration of hydrogen will markedly decrease the conversion- In temperature range of 580 ～630 ℃and 3000h -1 ofspace velocity,thefollowing kinetic equation is obtained : R= 3.423×1013e- 276 .45 ×103 RT CNH3·C- 1-5H2
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第5期462-466,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金
关键词
NI基催化剂
分解
转化率
高温
煤气
催化
脱氨
Ni- based catalyst,kinetic equation of NH3 decomposition ,comversion of ammonia decomposition
