Surface-dependent activity of model CoMoS hydrotreating catalysts
نویسندگان
چکیده
The current environmental and industrial contexts require constant revision improvement of hydrotreating processes for obtaining cleaner (bio)fuels through the development supported transition metal sulfide (TMS) catalysts. present work proposes a surface-science approach to describe surface-dependent genesis cobalt-promoted active phase (CoMoS) on α-Al2O3 single crystals used as surrogates γ-Al2O3 support. Co-Mo precursor solutions are deposited by aqueous-phase impregnation onto four C(0001), A(112¯0), M (101¯0), R(11¯02) orientations, which display specific OH sorption sites. model catalysts characterized in oxide states XPS, AFM, TEM revealing surface dependent sulfidation dispersion result metal-support interactions diverse nature. surfaces can be ranked following increasing strength C(0001) < (101¯0) good agreement with non-promoted However, AFM imaging also reveal that cobalt incorporation leads an increase stacking CoMoS particles respect activity thiophene hydrodesulfurization cannot simply related common features (sulfidation, dispersion, promotion extent) but volcano-shape curve is obtained when plotting function interactions. These results suggest high intermediate lead optimal metal-sulfur bond energy Sabatier principle. Transposing these traditional support suggests enhanced (1 0 0) facet, improved supports
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ژورنال
عنوان ژورنال: Journal of Catalysis
سال: 2021
ISSN: ['0021-9517', '1090-2694']
DOI: https://doi.org/10.1016/j.jcat.2021.01.026