Deactivation of HDS catalysts

Abstract

Deactivation of NiO-MoO3/γ-Al2O3 hydrodesulphurization (HDS) catalyst was followed both in an industrial plant and through laboratory simulation. Structural, textural and morphological changes were followed in different regeneration conditions. Mathematical models of the textural changes depending on time and temperature as independent variables were used in estimating the role of these variables in catalyst sintering. The mechanism of deactivation is proposed, pointing out critical conditions in processing and/or regeneration. Relative thermal stability depending on the promoter type was estimated. © 1998 Elsevier Science B.V. All rights reserved.