Synthesis effects on activity and stability of Pt-CeO2 catalysts for partial oxidation of methane
| Autor: | Rajib Kumar Singha, Chandrasekhar Pendem, Sumit Sain, L. N. Siva Kumar Konathala, Aditya Yadav, Astha Shukla, Rajaram Bal |
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| Rok vydání: | 2017 |
| Předmět: |
inorganic chemicals
Cerium oxide Materials science organic chemicals Process Chemistry and Technology Catalyst support Industrial catalysts Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Platinum nanoparticles 01 natural sciences Catalysis Nanomaterial-based catalyst 0104 chemical sciences Chemical engineering heterocyclic compounds Partial oxidation Physical and Theoretical Chemistry Temperature-programmed reduction 0210 nano-technology |
| Zdroj: | Molecular Catalysis. 432:131-143 |
| ISSN: | 2468-8231 |
| DOI: | 10.1016/j.mcat.2017.01.006 |
| Popis: | The objective of this study is to explore the effect of catalyst synthesis procedure on the activity of catalysts for partial oxidation of methane. In this aspect, Pt-nanoparticles supported CeO 2 catalysts were prepared by Hydrothermal, co-precipitation, impregnation and by controlled deposition of platinum nanoparticles on hydrothermally prepared cerium oxide. Prepared catalysts were characterized by BET-surface area, X-ray diffraction, H 2 -Chemisorption, Transmission electron microscopy, Temperature programmed reduction, Inductively coupled plasma atomic emission spectroscopy and X-ray photoelectron spectroscopy. The study revealed that the catalyst preparation procedure plays a very crucial role on morphology, catalyst particle size, metal support interaction and activity of the catalysts. Catalytic activities were tested for partial oxidation of methane in the temperature range 350–800 °C. The study revealed that the catalyst prepared by controlled deposition of Pt-nanoparticles on hydrothermally prepared cerium oxide showed better activity for partial oxidation of methane compared to the catalysts prepared by other conventional methods. Controlled deposition of Pt-nanoparticles generated better metal-support interaction compared to the catalysts prepared by conventional hydrothermal, co-precipitation and impregnation methods. All the catalysts showed excellent coke resisting ability but the deactivation of most of the catalyst was found to be caused by catalyst particles sintering and re-oxidation of the Pt particles during catalysis. |
| Databáze: | OpenAIRE |
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