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Diffusion and catalytic activity studies on resid‐deactivated HDS catalysts
Author(s) -
Johnson B. G.,
Massoth F. E.,
Bartholdy J.
Publication year - 1986
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690321207
Subject(s) - hydrodesulfurization , catalysis , coke , thermal diffusivity , chemistry , hydrodenitrogenation , diffusion , metal , chemical engineering , dibenzothiophene , heterogeneous catalysis , inorganic chemistry , thermodynamics , organic chemistry , physics , engineering
Three different pore size CoMo/Al 2 O 3 catalysts, which had been deactivated to the same extent during bench‐scale tests with an atmospheric resid, were examined for coke and metal deposits, diffusivity, and intrinsic activity for hydrodesulfurization, hydrogenation, and hydrodenitrogenation using model compounds. The aged catalysts had very low effective diffusivities and lower intrinsic activities than the fresh catalysts. Both metals and coke deposits were responsible for lowering diffusivity, but activity reduction appears to be predominantly due to metal deposits.