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In Situ Formation of a Sub-Nanometer Iridium Phosphide Catalyst from Supported Organometallic Species

preprint
submitted on 10.09.2020 and posted on 10.09.2020 by Boris Sheludko, Evan Wegener, Gokhan Celik, A. Jeremy Kropf, Cristina Castro, Massimiliano Delferro, Alan Goldman, David Kaphan, Fuat E. Celik

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 %.

Funding

First-Principles Design of Coke-Resistant Dehydrogenation Catalysts for Valorization of Light Hydrocarbon Feedstocks

Directorate for Engineering

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Alkane Transformations based on Dehydrogenation and Related Reactions: A Tandem Approach

Basic Energy Sciences

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DE-AC02-06H11357

History

Email Address of Submitting Author

fuat.celik@rutgers.edu

Institution

Rutgers, The State University of New Jersey

Country

USA

ORCID For Submitting Author

0000-0002-5891-6375

Declaration of Conflict of Interest

The authors declare no competing interests.

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