Regeneration of fixed beds of coked chromia—alumina catalyst
Regeneration of fixed beds of coked chromia—alumina catalyst
复制标题
焦化氧化铬-氧化铝固定床催化剂的再生
DOI：
10.1016/0009-2509(92)85016-5
复制
发表时间：
1992
影响因子：
4.7
通讯作者：
Y. P. Liu
中科院分区：
文献类型：
--
作者：
D. Acharya;R. Hughes;M. Kennard;Y. P. Liu
对焦化氧化铬-氧化铝颗粒固定床的再生进行了实验测量和模拟研究。该催化剂最初是通过丁烯脱氢而结焦的。再生过程中得到的温度曲线被发现表现出陡峭的梯度和尖锐的最大值，不像其他焦化催化剂，如二氧化硅-氧化铝或沸石裂化催化剂的再生过程中观察到的。建立了数学模型，并采用正交配置有限元法进行求解。这种方法使反应器中的陡峭的温度梯度进行模拟，而全球配置技术要么失败，或需要非常大量的配置点的建模结果给出了良好的协议与实验获得的温度和焦炭的配置文件。
Experimental measurements and modelling studies have been made for the regeneration of fixed beds of coked chromia—alumina particles. The catalyst was coked initially by the dehydrogenation of butene. Temperature profiles obtained during regeneration were found to exhibit steep gradients and sharp maxima unlike those observed during regeneration of other coked catalysts such as silica—alumina or zeolite-cracking catalyst. A mathematical model has been developed and solved using the method of orthogonal collocation on finite elements. This method has enabled the steep temperature gradients in the reactor to be simulated whereas the global collocation technique either fails or requires a very large number of collocation points The modelling results gave excellent agreement with the experimentally obtained temperature and coke profiles.