Highly restrictive diffusion under hydrotreating reactions of heavy residue oils
Highly restrictive diffusion under hydrotreating reactions of heavy residue oils
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DOI：
10.1021/ie00042a024
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发表时间：
1995-03
影响因子：
4.2
通讯作者：
Chiuping Li;Yu‐Wen Chen;M. Tsai
中科院分区：
文献类型：
--
作者：
Chiuping Li;Yu‐Wen Chen;M. Tsai
考察了反应物分子直径与催化剂孔径之比（λ）对CoMo/Al_2O_3-磷酸铝催化剂上重质渣油加氢处理反应在高限制条件下的限制扩散的影响。在滴流床反应器中，在663 K、7.6 MPa条件下，以CoMo/Al 2 O3-磷酸铝为催化剂，进行了渣油加氢处理反应。将Thiele关系应用于催化反应，确定了HDS和HDM反应的有效扩散系数和相应的有效因子。HDM反应的有效扩散系数总是小于HDS反应的有效扩散系数。此外，有效扩散系数值随反应物分子直径与催化剂孔径的比率的增加而减小，这表明对于HDS和HDM反应，存在较大的限制性扩散效应。两种不同的制度限制扩散观察。在反应条件下的限制效应对于{λ}的低值仍然是严重的。但是，对于{lambda}的高值，此效应似乎并不突出
The effect of the ratio ({lambda}) of reactant molecular diameter to catalyst pore diameter on the restrictive diffusion under a highly restrictive regime of hydrotreating reactions of heavy residue oils over CoMo/alumina-alumina phosphate catalysts was investigated. Hydrotreating reactions of residual oils were carried out in a trickle bed reactor at 663 K and 7.6 MPa over a series of CoMo/alumina-aluminum phosphate catalysts. The values of the effective diffusivities and the relevant effectiveness factors for HDS and HDM reactions were determined by applying the Thiele relation to catalytic reactions. The effective diffusivities for the HDM reaction are always smaller than those for the HDS reaction. In addition, the effective diffusivity values decreased with increasing ratios of reactant molecular diameters to catalyst pore diameters for both HDS and HDM reactions, indicating a large restrictive diffusion effect. Two different regimes for restrictive diffusion were observed. The restrictive effect under reaction conditions is still severe for low values of {lambda}. However, this effect does not seem prominent for high values of {lambda}