Probing hydrodesulfurization over bimetallic phosphides using monodisperse Ni2-xMxP nanoparticles encapsulated in mesoporous silica
作者： Samuel J. Danforth , D. Ruchira Liyanage , Asha Hitihami-Mudiyanselage , Boris Ilic , Stephanie L. Brock
DOI: 10.1016/J.SUSC.2015.10.005
关键词:
摘要: Abstract Metal phosphide nanoparticles encapsulated in mesoporous silica provide a well-defined system for probing the fundamental chemistry of hydrodesulfurization (HDS) reaction over this new class hydrotreating catalysts. To investigate composition effects bimetallic phosphides, HDS dibenzothiophene (DBT) was carried out series Ni-rich Ni2-xMxP@mSiO2 (M = Co, Fe) nanocatalysts (x ≤ 0.50). The Ni2-xMxP (average diameters: 11–13 nm) were prepared by solution-phase arrested precipitation and silica, characterized range techniques (XRD, TEM, IR spectroscopy, BET surface area, CO chemisorption) tested DBT activity selectivity. highest observed Ni1.92Co0.08P@mSiO2 nanocatalyst, but overall trend decrease with increasing Co or Fe content. In contrast, turnover frequency (TOF) most Co- Fe-rich compositions based on sites titrated chemisorption. spectral studies adsorbed catalysts indicate that an increase electron density occurs Ni as content is increased, which may be responsible increased TOFs catalytic sites. exhibit strong preference direct desulfurization pathway (DDS) changes only slightly
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