Document Type

Article

Original Publication Date

2017

Journal/Book/Conference Title

Applied Surface Science

Volume

402

First Page

99

Last Page

107

DOI of Original Publication

10.1016/j.apsusc.2017.01.061

Comments

Originally published at https://doi.org/10.1016/j.apsusc.2017.01.061

Date of Submission

June 2017

Abstract

Co3O4 incorporated within mesoporous MCM-41 silica have been successfully synthesized and promoted with Pd nanoparticles through a microwave irradiation (MWI) approach. Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), N2-physisorped, X-ray photoelectron spectroscopy (XPS),temperature program reduction of hydrogen (H2-TPR),temperature program desorption of oxygen (O2-TPD) and high resolution transmission electron microscopy (HRTEM) were adapted to characterize these prepared catalysts. Carbon monoxide oxidation as a model reaction was then used to assess the catalytic performance of these materials. In the light of H2-TPR and XPS results, revealed that the coexisting of Co3+ and Co2+ species as well as surface Co3+/Co2+ ratio within the hexagonal mesoporous of MCM-41, could create an ideal environment to accomplish most extreme catalytic activity. On the other hand, the enhanced CO oxidation by Pd nanoparticles deposition has been explained in the light of the enhancement of the redox ability and tuning the electronic structure of Co3O4, which improved the O2 activation and reduced the adsorption ability of CO simultaneously, which significantly boosted the catalytic performance of CO oxidation. This work provides insights into factors that could lead to improved low temperature CO oxidation performance in Pd-based catalysts.

Rights

© 2017 Elsevier B.V. All rights reserved.

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Promotion effect of palladium on Co3O4 incorporated within mesoporous MCM-41 silica for CO Oxidation

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