Influence of activation and the HDS reaction on the structure of magnesium fluoride-supported Ru catalysts derived from ruthenium chloride hydrate

Document Type

Article

Publication Date

4-1-2003

Abstract

The effect of activation conditions and the hydrodesulfurization (HDS) process on the structure of Ru/MgF2 prepared from RuCl 3·nH2O precursor catalysts was studied. During the first 6-7 h of the HDS process significant differences in activities were detected between samples pretreated in 50% H2S/H2 and in 50% H2S/He. During this transient time, the Ru/MgF2 catalyst pretreated in 50% H2S/H2 increased in activity while the activity of that pretreated in H2S/He decreased. XRD, TPR and quantitative analysis of sulfur content revealed that directly after activation in H2S/He crystalline ruthenium sulfide is the main component of the surface, whereas after activation in H2S/H 2 both RuS2 and metallic Ru are present on the surface. These differences decrease during the thiophene HDS process. Despite the different pretreatment conditions, the composition of the surface tends to "equilibrate", which results in similar activity after prolonged reaction time.

Publication Source (Journal or Book title)

Catalysis Letters

First Page

153

Last Page

157

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