The effect of La2O3 and CeO2 modifiers on properties of Ni–Al catalysts for LNG prereforming
| Autor: | Marcin Konkol, Robert Bicki, Janusz Ryczkowski, Katarzyna Antoniak-Jurak, Kamila Michalska, Monika Panczyk, Paweł Kowalik, Ewelina Franczyk, Tadeusz Borowiecki, Grzegorz Słowik |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Diffusion Energy Engineering and Power Technology 02 engineering and technology Coke 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Steam reforming Fuel Technology X-ray photoelectron spectroscopy Chemical engineering Chemisorption 0210 nano-technology High-resolution transmission electron microscopy Dispersion (chemistry) |
| Zdroj: | International Journal of Hydrogen Energy. 46:11664-11676 |
| ISSN: | 0360-3199 |
| Popis: | Ni/La–Al2O3 and Ni/Ce–Al2O3 catalysts with a small amount of promoters intended for prereforming of LNG were characterized by XRF, N2 adsorption-desorption, XRD, H2 chemisorption, HRTEM and XPS. The catalytic activity was evaluated in methane steam reforming both in the kinetic and diffusion regime, at temperatures characteristic of pre-reforming. Carbonaceous deposit was analysed by TPO-MS method. The nature and location of the coke were studied by HRTEM. La or Ce addition into Ni–Al system causes the increase of the active surface area of Ni by enhancing its dispersion. Studies at kinetic regime have shown that the promoted catalysts have almost twice the activity than reference Ni–Al catalyst. This effect was not confirmed by measurements in the diffusion regime on whole catalyst tablets. Almost identical textural properties of catalysts and diffusive limitations related to them but not the catalytic properties of the material itself appeared to be crucial factors. The presence of La (but not Ce) causes a significant increase in resistance to coking. |
| Databáze: | OpenAIRE |
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