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Effect of restrictive diffusion on hydrodesulfurization of heavy residue oils over CoMo/Al 2 O 3
Author(s) -
Chen YuWen,
Tsai MingChang,
Li Chiuping,
Kang BenChang
Publication year - 1994
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450720512
Subject(s) - hydrodesulfurization , catalysis , chemistry , residue (chemistry) , sulfide , sulfur , sulfidation , diffusion , thermal diffusivity , claus process , fuel oil , chemical engineering , thermodynamics , inorganic chemistry , organic chemistry , hydrogen sulfide , physics , engineering
The effect of the ratio of reactant molecular diameter to catalyst pore diameter (λ) on the restrictive diffusion under hydrodesulfurization (HDS) reactions of heavy residue oils over CoMo/Al 2 O 3 catalysts was investigated. A series of Al 2 O 3 with various pore structures were used as supports of CoMo sulfide. The HDS reaction was carried out in a semi‐batch Carberry type reactor at 648 K and 10.3 MPa. Two empirical correlations for restrictive diffusion under HDS reaction conditions were developed depending on the value of λ. The results showed that the restrictive diffusion effect under HDS reaction conditions is severe for the lower values of λ. However, this effect seems not prominent for higher values of λ. The order of the magnitude of the effective diffusivity was in the range of 10 −6 ‐10 −7 cm 2 /s for the sulfur‐containing compounds of residue oil in CoMo/Al 2 O 3 catalysts at 648 K.