Fessi, S., Mamede, A.S., Ghorbel, A. and Rives, A. (2012) Sol-Gel Synthesis Combined with Solid-Solid Exchange Method, a New Alternative Process to Prepare Improved Pd/SiO₂-Al₂O₃ Catalysts for Methane Combustion. Catalysis Communications, 27, 109-113.
https://doi.org/10.1016/j.catcom.2012.06.016

has been cited by the following article:

• TITLE: Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

  AUTHORS: Khouloud Sadouki, Shemseddine Fessi, Zouhaier Ksibi, Mickael Capron, Franck Dumeignil, Abdelhamid Ghorbel

  KEYWORDS: Pd/(CexZr(1-x)O2)/SiO2 Catalysts, Methane Combustion, Catalytic Activity

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.8 No.3, March 16, 2018

  ABSTRACT: Aerogel Pd/(Ce0.33Zr0.66O2)SiO2 catalysts (CeZry) were prepared with variable Ce and Zr loadings (molar ratio Ce/Zr = 1/2) by combining sol-gel and impregnation methods. First, N2-physisorption was used to investigate the texture evolution. Then, H2-chimisorption and TEM were performed to study the effect on particle dispersion. After, TPR was used to determine the catalyst reducibility. Furthermore, XPS characterization was done to identify the palladium oxidation state and to evaluate the Pd-support interaction. Finally, the prepared catalysts were tested in methane combustion to assess their catalytic activity. The obtained results showed that, when the Zr and Ce loadings are varied between 0% and 8% and between 0% and 6% respectively, the BET surface area was increased from 615 to 744 m2/g, the porosity diameter from 45.7 to 83.6 Å, the Pd particle diameter from 5.2 to 7.0 nm, the CeO2 and ZrO2 particle size from 0 to 68 nm, the reduction temperature shift reached 16°C, the Pd binding energy shift attained 0.6 eV, but an optimum amounts of Zr (4 wt.%) and Ce (3 wt.%) are needed to maximize the PdO reducibility and to enhance the catalytic activity. In effect, 100% conversion of methane was reached at around 415°C on the CeZr4 catalyst.