Performance of a Biomimetic Oxidation Catalyst Immobilized on Silica Particles
(English)Manuscript (preprint) (Other academic)
A biomimetic oxidation catalyst, cobalt porphyrin with thiol-linkers, was chemically conjugated to silica particles and utilized in the oxidation of hydroquinone to benzoquinone. The cobalt porphyrin/silica particle catalyst was characterized with Inductively Coupled Plasma (ICP) and X-ray Photoelectron Spectroscopy (XPS). The catalytic performance of the cobalt porphyrin molecules was compared to previous results for the same catalyst grafted to a gold surface and on silicon wafers. The measured catalytic activity, after background correction, was 100 times higher than that of its homogeneous counterpart, 10 times higher than that on a silicon wafer, and almost the same as that on a gold surface. The turnover frequency rates after 400 hours are still comparable with initial rates reported for homogeneous porphyrins and salophens whereas the use of particles as support increases the active surface area, which removes the limitations for scale-up associated with the previously used silicon wafers and gold surfaces.
Research subject Organic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-88203OAI: oai:DiVA.org:su-88203DiVA: diva2:610345