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Catalyst Recovery and Recycling Facilitated by Magnetic Separation: Iridium and Other Metal Nanoparticles
Author(s) -
Jacinto Marcos J.,
Silva Fernanda P.,
Kiyohara Pedro K.,
Landers Richard,
Rossi Liane M.
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201100415
Subject(s) - iridium , catalysis , leaching (pedology) , magnetic separation , metal , nanoparticle , magnetite , chemical engineering , magnetic nanoparticles , heterogeneous catalysis , materials science , surface modification , catalyst support , support surface , inorganic chemistry , chemistry , organic chemistry , nanotechnology , metallurgy , medicine , environmental science , radiology , soil science , engineering , soil water
The immobilization of metal nanoparticles in magnetic responsive solids allows the easy, fast, and clean separation of catalysts; however, the efficiency of this separation process depends on a strong metal–support interaction. This interaction can be enhanced by functionalizing the support surface with amino groups. Our catalyst support contains an inner core of magnetite that enables the magnetic separation from liquid systems and an external surface of silica suitable for further modification with organosilanes. We report herein that a magnetically recoverable amino‐functionalized support captured iridium species from liquid solutions and produced a highly active hydrogenation catalyst with negligible metal leaching. An analogous Ir 0 catalyst prepared with use of a nonfunctionalized support shows a higher degree of metal leaching into the liquid products. The catalytic performance in the hydrogenation of alkenes is compared with that of Rh and Pt catalysts.