کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56899 47100 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of the promoter's nature (nickel or cobalt) on the active phases ‘Ni(Co)MoS’ modifications during deactivation in HDS of diesel fuel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Influence of the promoter's nature (nickel or cobalt) on the active phases ‘Ni(Co)MoS’ modifications during deactivation in HDS of diesel fuel
چکیده انگلیسی

The characterization of various spent Ni(Co)MoP/Al2O3 catalysts has been performed in order to elucidate the active phase modifications undergone on the catalysts at operating conditions. Six catalysts coming either from industrial or pilot reactors were studied. The deactivation level (for hydrogenation reaction) can be determined by XPS analysis quantifying the ‘Ni(Co)MoS’ mixed phase amount. The spent catalyst active phases characteristics, at different levels of deactivation, firstly evidenced that the coke particularly influences the CoMo active phase (X-ray photoelectron spectroscopy) lowering the ‘CoMoS’ mixed phase amount. On the spent NiMo catalysts, most of the nickel is segregated (XPS, Extended X-ray Absorption Fine Structure, Transmission Electronic Microscopy/Energy Dispersive Spectroscopy) even after low residence time in the unit (pilot plant origin). In both cases it leads to the progressive deactivation of the catalyst. The coke does not seem to influence the ‘NiMoS’ mixed phase amount excepted at its life-end.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 149, Issues 1–2, 15 January 2010, Pages 2–10
نویسندگان
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