In situ Formation of a Sub-Nanometer Iridium Phosphide Catalyst from Supported Organometallic Species
2020
While several metal phosphides have
attracted significant attention in the last several years due to their
potential use as photocatalytic and hydrotreating catalysts, iridium phosphide
has remained largely unexplored. In this work, silica-supported pincer-iridium
species are thermolyzed, resulting in deconstruction of the tridentate ligand
precursor and formation of a sub-nanometer iridium phosphide phase
characterized by 31P magic angle spinning nuclear magnetic resonance
(31P-MAS-NMR), X-ray absorption spectroscopy (XAS), and high angle
annular dark field scanning transmission electron microscopy (HAADF-STEM). The
support material was found to play an active role in determining the product of
the surface thermolysis, with the silica supported material generating
phosphorus rich iridium phosphide nanoparticles. The resulting silica-supported
iridium phosphide phase is explored as a thermocatalyst for non-oxidative butane
dehydrogenation, achieving high initial reaction rates up to 900 molbutenes molcatalyst-1
hr-1 and a terminal olefin selectivity of up to 70 %.
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