Modeling of catalyst pellets for Fischer-Tropsch synthesis
Modeling of catalyst pellets for Fischer-Tropsch synthesis
复制标题
费托合成催化剂颗粒的建模
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Bijiang Zhang
中科院分区：
文献类型：
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作者：
Yi;Yuan;H. Xiang;Yong;Bijiang Zhang
本文主要研究了Fischer-−-Tropsch合成催化剂颗粒中的转移和反应现象。认为在Fischer-−-Tropsch合成条件下，催化剂颗粒的孔道中填充了液体蜡。大块气相中的反应物溶解在球团外表面的蜡中，溶解的组分通过球团内的蜡扩散并在球团内表面上反应。用修正的SRK状态方程(MSRK状态方程)关联了体相中气体和孔道中的液体蜡之间的热力学平衡。根据实验中观察到的现象，提出了一个用于催化剂设计模拟的综合颗粒模型，其中适当地嵌入了详细的Fischer-−-Tropsch机理动力学。进一步研究了催化剂颗粒内的反应和扩散相互作用及其对产物选择性的影响。探讨了蛋壳型催化剂颗粒作为一种新型催化剂的应用前景。
The present work focuses on the transfer and reaction phenomenon in a catalyst pellet for Fischer−Tropsch synthesis. It is considered that the pores of catalyst pellets are filled with liquid wax under Fischer−Tropsch synthesis conditions. The reactants in the bulk gas phase dissolve in the wax at the external surface of the pellet, and the dissolved components diffuse through the wax inside the pellet and react on the internal surface of the pellet. The thermodynamic equilibrium between the gases in the bulk and the liquid wax in the pores is correlated by a modified SRK equation of sate (MSRK EOS). On the basis of the phenomena observed from experiments, a comprehensive pellet model is suggested for catalyst design simulation, in which detailed Fischer−Tropsch mechanistic kinetics is properly imbedded. The reaction and diffusion interaction in a catalyst pellet and its effect on the product selectivity are further investigated. The potential of using eggshell-type catalyst pellets is explored as a means...