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Synthesis of hierarchically porous silica aerogel supported Palladium catalyst for low-temperature CO oxidation under ignition/extinction conditions
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-0589-6833
Virginia Commonwealth University in Qatar, Libral Arts and Sciences Program, P.O. Box 8095, Doha, Qatar.
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-1679-1316
Department of Physics, College of Science, Sultan Qaboos University, P.O. Box 36, Muscat, PC 123, Oman.
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2020 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 292, article id 109758Article in journal (Refereed) Published
Abstract [en]

Synthesis of well-dispersed palladium nanoparticles within silica aerogel pores with controlled size was carried out using sol-gel synthesis under supercritical ethanol drying. The high concentration of silanol groups on silica (SiO2) surface facilitated a superior palladium (Pd) loading up to 10 wt %. The synthesized Pd/SiO2 nanocomposite aerogels were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopic methods. The silica aerogel supported catalysts were found to have a wide pore size distribution. TEM investigations confirmed that Pd nanocrystals were located within the SiO2 microspores and mesopores. The catalyst was evaluated for carbon monoxide (CO) oxidation reaction under ignition/extinction conditions. The synthesized catalyst demonstrated a high catalytic activity at low operating temperatures (<200 °C) compared to unsupported Pd nanoparticles or bare SiO2 aerogels. This enhancement in CO oxidation activity with Pd/SiO2 aerogel catalysts are attributed to the small Pd particles, Pd interaction with the surface of the underlying SiO2 and the better dispersion of Pd particles within the SiO2 pores. Porosity played a more important role during the extinction cycle as a result of the slow dissipation of the heat leading to hysteresis. We demonstrate the influence of porosity of catalyst supports on the size, dispersion, and catalytic activity of Pd nanoparticles.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 292, article id 109758
Keywords [en]
Vapor-Phase Synthesis, Carbon-Monoxide, Nanoparticle Catalysts, Pd/Sio2 Catalysts, Methane, Pd, Behavior, Oxygen, Reduction, Kinetics
National Category
Nano Technology Other Physics Topics
Research subject
Physics, Material and Nano Physics
Identifiers
URN: urn:nbn:se:kth:diva-263430DOI: 10.1016/j.micromeso.2019.109758ISI: 000498292200033Scopus ID: 2-s2.0-85072675475OAI: oai:DiVA.org:kth-263430DiVA, id: diva2:1375573
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-20Bibliographically approved

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Al-Soubaihi, RolaFei, YeDutta, Joydeep

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