4.8 Article

Catalytic Enhancement of Inductively Heated Fe3O4 Nanoparticles by Removal of Surface Ligands

Journal

CHEMSUSCHEM
Volume 14, Issue 4, Pages 1122-1130

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002775

Keywords

carboxylates; colloids; heterogeneous catalysis; induction heating; nanoparticles

Funding

  1. Louisiana College of Engineering
  2. Chevron Fellowship Award
  3. U.S. Department of Energy (DOE) under EPSCOR grant [DE-SC0012432]
  4. Louisiana Board of Regents [LEQSF(2016-19)-RD-A-03]
  5. National Science Foundation, Chemical, Biological, Environmental, and Transport systems [CBET-1805785]

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Heat management in catalysis is limited by each material's heat transfer efficiencies, but induction heating of magnetic nanoparticles can reduce waste heat via dissipation. Efficient surfactant removal, such as using pyridine, can increase heat generation and product yield in induction heating catalysis, improving heat transfer and available surface sites.
Heat management in catalysis is limited by each material's heat transfer efficiencies, resulting in energy losses despite current thermal engineering strategies. In contrast, induction heating of magnetic nanoparticles (NPs) generates heat at the surface of the catalyst where the reaction occurs, reducing waste heat via dissipation. However, the synthesis of magnetic NPs with optimal heat generation requires interfacial ligands, such as oleic acid, which act as heat sinks. Surface treatments using tetramethylammonium hydroxide (TMAOH) or pyridine are used to remove these ligands before applications in hydrophilic media. In this study, Fe3O4 NPs are surface treated to study the effect of induction heating on the catalytic oxidation of 1-octanol. Whereas TMAOH was unsuccessful in removing oleic acid, pyridine treatment resulted in a roughly 2.5-fold increase in heat generation and product yield. Therefore, efficient surfactant removal has profound implications in induction heating catalysis by increasing the heat transfer and available surface sites.

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