Thermal Analysis Kinetics of Pd-Doped SiO₂ Organic-Inorganic Hybrid Material

Abstract:

Pd-doped SiO₂ organic-inorganic hybrid material (Pd/M-SiO₂) was prepared by sol-gel method and characterized by XRD, FTIR spectra and TG/DTG analysis. The most probable kinetic mechanism function, apparent activation energy and pre-exponential factor of the thermal decomposition for Pd/M-SiO₂ material were calculated using the combined Coast-Redfern intergral and Αchar differential methods. Pd element in noncalcined Pd/M-SiO₂ materials exists in PdCl₂ form. FTIR spectroscopy confirmed the existence of hydrophobic Si−CH₃ groups. The thermal decomposition process of Pd/M-SiO₂ materials can be divided into four stages, with different mechanism functions. The activation energies are 76.37, 146.85, 208.90 and 413.89 kJ·mol⁻¹ for the four stages, respectively, and the pre-exponential factors are 5.04×10¹², 7.14×10¹³, 2.93×10¹² and 6.56×10¹⁹ s⁻¹, respectively. There is no obvious influence of the existence of metallic Pd⁰ on the thermal decomposition of methyl.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 272-279
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.272
• Online since: January 2017
• Authors: Jing Yang, Hong Jun Li, Rui Hua Mu, Ya Mei Zhao, Zhi Tong
• Keywords: Achar Differential Method, Coast-Redfern Intergral Method, Kinetic Triplets, Methyl Modification, Palladium-Doped Silica

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