Effects of Pt precursors on Pt/CeO2 to water-gas shift (WGS) reaction activity with Langmuir-Hinshelwood model-based kinetics
| Autor: | Jong Wook Bae, Myung-June Park, Minji Son, Yong Min Park |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Reactions on surfaces
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Water-gas shift reaction 0104 chemical sciences Catalysis Steam reforming chemistry.chemical_compound Fuel Technology Chemical engineering Catalytic reforming chemistry Propane Thermal stability 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45:26953-26966 |
| ISSN: | 0360-3199 |
| Popis: | The crystallite size effects of Pt nanoparticles on the CeO2 (Pt/CeO2) prepared with four different Pt precursors were investigated in terms of their thermal stability and catalytic activity for a water-gas shift (WGS) reaction using the compositions of reformates after a typical steam reforming of propane. The Pt/CeO2 prepared with a diamine dinitroplatinum (Pt(NO2)2(NH3)3) precursor, which forms the cationic Pt(NH3)22+ species on the negatively-charged CeO2 surfaces, revealed a superior catalytic activity and thermal stability by forming the partially oxidized smaller Pt nanoparticles decorated with metallic Pt surfaces as well as by forming the strongly interacted PtOx-CeO2 interfaces. The stable preservation of the pristine smaller Pt nanoparticles with small aggregations even under the hysteresis test from 250 to 400 °C was mainly attributed to the strong metal-support interactions. The optimized Pt/CeO2 was further studied to obtain kinetic equations derived by Langmuir-Hinshelwood (LH) model, and the optimal operating conditions of WGS reaction were found to be ~280 °C and H2O/CO molar ratio of 9 with the activation energy of ~78.4 kJ/mol. |
| Databáze: | OpenAIRE |
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