Catalysts for second-stage deep hydrodesulfurisation of gas oils

• Published in: Fuel processing technology Vol. 61; no. 1; pp. 133 - 147
• Main Authors: Reinhoudt, H.R., Troost, R., van Langeveld, A.D., Sie, S.T., van Veen, J.A.R., Moulijn, J.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.1999
• Subjects: Catalyst; Hydrodesulfurisation; Second-stage; Hydrodesulfurisation; Catalyst; Second-stage
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/S0378-3820(99)00035-1

The interest for new deep hydrodesulfurisation (HDS) processes is expected to rise since more stringent legislation for the maximum sulfur concentration in automotive diesel fuel has been proposed. A realistic option is the application of a separate deep HDS reactor following the existing HDS process in which alternative catalysts may be applied. It was shown that ASA-supported Pt and PtPd catalysts are very active in model feed deep HDS reactions. Moreover, in the deep HDS of a pre-hydrotreated straight-run gas oil (P-SRGO) under relevant industrial conditions, PtPd/ASA showed a very promising performance. The applicability of ASA-supported noble metal catalysts in practice will be largely determined by the H 2S concentration in the second-stage reactor and the price of noble metals. In addition, NiW/γ-Al 2O 3 is also considered to be a promising catalyst for second-stage deep HDS. From the differences in the relative performance between model and real feed experiments, it is found that the suitability of a catalyst for deep HDS of gas oils cannot be evaluated by single-component model studies alone. The H 2S concentration and the presence of other competing reactants largely determine the outcome of model experiments and should therefore be chosen carefully.