Synthesis of hierarchically porous silica aerogel supported Palladium catalyst for low-temperature CO oxidation under ignition/extinction conditions

Rola Mohammad Al Soubaihi, Khaled Saoud, Fei Ye, Myo Tay Zar Myint, Shaukat Saeed, Joydeep Dutta

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number109758
JournalMicroporous and Mesoporous Materials
Volume292
DOIs
Publication statusPublished - 15 Jan 2020

Fingerprint

Aerogels
aerogels
Palladium
Carbon Monoxide
Carbon monoxide
Silicon Dioxide
carbon monoxide
ignition
Ignition
palladium
extinction
Silica
silicon dioxide
catalysts
Oxidation
oxidation
Catalysts
synthesis
porosity
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Synthesis of hierarchically porous silica aerogel supported Palladium catalyst for low-temperature CO oxidation under ignition/extinction conditions. / Al Soubaihi, Rola Mohammad; Saoud, Khaled; Ye, Fei; Zar Myint, Myo Tay; Saeed, Shaukat; Dutta, Joydeep.

In: Microporous and Mesoporous Materials, Vol. 292, 109758, 15.01.2020.

Research output: Contribution to journalArticle

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AU - Saeed, Shaukat

AU - Dutta, Joydeep

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