Restrictive diffusion under hydrotreating reactions of heavy residue oils in a trickle bed reactor
Restrictive diffusion under hydrotreating reactions of heavy residue oils in a trickle bed reactor
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DOI：
10.1021/ie00020a011
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发表时间：
1993-08
影响因子：
4.2
通讯作者：
M. Tsai;Yu‐Wen Chen;Chiuping Li
中科院分区：
文献类型：
--
作者：
M. Tsai;Yu‐Wen Chen;Chiuping Li
研究了反应物分子直径与催化剂孔径之比对CoMo/氧化铝-磷酸铝催化剂上重渣油加氢处理反应限制扩散的影响。渣油的加氢处理反应在滴流床反应器中在 663 K 和 7.6 MPa 下在一系列 CoMo/氧化铝-磷酸铝催化剂上进行。结果表明，反应条件下的限制作用仍然严重。通过将 Thiele 关系应用于催化反应，确定了加氢脱硫 (HDS) 和加氢脱金属 (HDM) 反应的有效扩散系数和相关有效性因子。 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，对于 HDS 和 HDM 反应，有效扩散率值随着反应物分子直径与催化剂孔径之比的增加而降低，这表明存在很大的限制性扩散效应。
The effect of the ratio of reactant molecular diameter to catalyst pore diameter on the restrictive diffusion under hydrotreating reactions of heavy residue oils over CoMo/alumina-aluminum 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 results showed that the restrictive effect under reaction conditions is still severe. The values of the effective diffusivities and the relevant effectiveness factors for hydrodesulfurization (HDS) and hydrodemetalation (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.