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

Natalia S. Moura, Khashayar R. Bajgiran, Cameron L. Roman, Luke Daemen, Yongqiang Cheng, Jimmy Lawrence, Adam T. Melvin, Kerry M. Dooley, James A. Dorman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1122-1130
Number of pages9
JournalChemSusChem
Volume14
Issue number4
DOIs
StatePublished - Feb 18 2021
Externally publishedYes

Funding

N.S.M. acknowledges the fellowship support from the Louisiana College of Engineering, the Chevron Fellowship Award, the U.S. Department of Energy (DOE) under EPSCOR grant no. DE‐SC0012432 and John Harvey for the development of a pixel measurement tool to obtain nanoparticle size distributions. K.R.B. acknowledges the Louisiana Board of Regents (LEQSF(2016‐19)‐RD‐A‐03) for financial support. J.A.D., C.R., and K.M.D would also like to acknowledge the National Science Foundation, Chemical, Biological, Environmental, and Transport systems for funding under grant no. CBET‐1805785. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors thank Mr. Tochukwu Ofoegbuna for his assistance in performing XRD characterization. N.S.M. acknowledges the fellowship support from the Louisiana College of Engineering, the Chevron Fellowship Award, the U.S. Department of Energy (DOE) under EPSCOR grant no. DE-SC0012432 and John Harvey for the development of a pixel measurement tool to obtain nanoparticle size distributions. K.R.B. acknowledges the Louisiana Board of Regents (LEQSF(2016-19)-RD-A-03) for financial support. J.A.D., C.R., and K.M.D would also like to acknowledge the National Science Foundation, Chemical, Biological, Environmental, and Transport systems for funding under grant no. CBET-1805785. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors thank Mr. Tochukwu Ofoegbuna for his assistance in performing XRD characterization.

FundersFunder number
LEQSF2016‐19)‐RD‐A‐03
Louisiana College of Engineering
National Science Foundation1805785, CBET‐1805785
U.S. Department of EnergyDE‐SC0012432
Office of Science
Oak Ridge National Laboratory
Louisiana Board of Regents

    Keywords

    • carboxylates
    • colloids
    • heterogeneous catalysis
    • induction heating
    • nanoparticles

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