Portal de Periódicos da CAPES

Hydrotreating of compounds and mixtures of compounds having mercapto and hydroxyl groups

1997; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(97)80032-8

2542-6613

T.-R. Viljava, A.O.I. Krause,

Catalytic Processes in Materials Science

Simultaneous hydrodesulfurization (HDS) and hydrodeoxygenation (HDO) of mercapto andhydroxyl group containing benzenes was studied using a commercial presulfided CoMo/γ-Al2O3 catalyst under hydrotreating conditions (150–280°C, 7 MPa). Mercaptobenzene, phenol and 4-mercaptophenol were used as model compounds, and CS2 was used as precursor for H2S. The HDS rate of a mercapto group in the presence of a hydroxyl substituent in the para position was higher than that for the molecule containing only a mercapto group. When the hydroxyl group was present as phenol, the HDS rate of the mercapto group was about 30% lower than that for mercaptobenzene without an oxygen-containing additive. The decrease in the HDS rate was independent of the initial molar ratio of sulfur and oxygen within the ratios studies (5:1-1:1). The HDO rate of a hydroxyl group was suppressed by the mercapto group present either in the same or in a separate molecule. HDO reactions did not start until HDS conversion was almost complete. CS2 also decreased the HDO rate of phenol. When was decreased in the presence of a sulfur additive more than the hydrogenolysis-hydrogenation route to cyclohexane.