کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6454510 | 1418817 | 2017 | 10 صفحه PDF | دانلود رایگان |
- Synthesis of reducible mesoporous transition metal oxide materials by inverse micelle approach in acidic medium.
- Synthesis of well-dispersed random alloy nanoparticles using dendrimer as a template.
- Oxidation of morin performed using metal nanoparticles immobilized on mesoporous metal oxide materials as catalysts.
- Synergic effect of metal-support description according to Langmuir-Hinshelwood and Mars-van Krevelen approaches.
Well-dispersed, random alloy, palladium-gold nanoparticles (2.66 ± 0.51 nm) were immobilized onto several reducible mesoporous transition metal oxide materials. The composites (palladium-gold nanoparticles immobilized onto mesoporous transition metal oxide (PdAu-MTMO)) were characterized through several analytical methods such as UV-vis spectroscopy, BET, XRD, FT-IR, ICP-OES, TEM and TPR analyses. Catalytic oxidation of morin (quercetin) was performed as a model reaction in the presence of hydrogen peroxide to investigate the synergic catalytic activity of the composite. Silica was used as inert support to isolate the catalytic activity of the metal nanoparticles (32.69 ± 9.93 kJ molâ2). Synergistic interaction of PdAu-MTMO was mechanically described according to Langmuir-Hinshelwood and Mars-van Krevelen approaches. The TOF of PdAu-Co3O4 (6073.23 ± 85.01 sâ1 molâ1) was considerably larger than that of random alloy nanoparticles (PdAu-SiO2 (25.71 ± 2.35 sâ1 molâ1)). The Arrhenius-type plot was constructed to determine the synergistic activity of the composite, where PdAu-Co3O4 described the best synergistic interaction.
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Journal: Applied Catalysis B: Environmental - Volume 203, April 2017, Pages 505-514