Effect of acidity on the performance of a Ni-based catalyst for hydrogen production through propane steam reforming: K-AlSi O support with different Si/Al ratios
Autor: | Byeong Sub Kwak, Seung Won Jo, Tae Jin Lee, Min-Kyu Jeon, No-Kuk Park, Misook Kang, Sang Tae Lee, Jeong Yeon Do, Moon Soon Cha |
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Rok vydání: | 2017 |
Předmět: |
inorganic chemicals
Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry Non-blocking I/O Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Steam reforming Reaction rate chemistry.chemical_compound Nickel Fuel Technology Adsorption chemistry Propane 0210 nano-technology Hydrogen production |
Zdroj: | International Journal of Hydrogen Energy. 42:22687-22697 |
ISSN: | 0360-3199 |
DOI: | 10.1016/j.ijhydene.2017.07.161 |
Popis: | Propane steam reforming (PSR) for the production of H2 was catalyzed by a NiO/K-AlSixOy catalyst synthesized with various Si/Al ratios (Si/Al = 0, 0.3, 0.5, 0.7, and 1.0). The effect of the Si/Al ratio on the acidity of the NiO/K-AlSixOy catalyst for PSR was investigated. NiO/K-AlSixOy gave a higher H2 selectivity and stability during PSR than NiO/K-SiO2 and NiO/K-Al2O3. The NH3-TPD results showed that the acid quantity and strength of NiO/K-AlSixOy changed significantly depending on the Si/Al ratio. With an increased Si/Al ratio, the densities of both weak and strong acid sites increased. The C3H8- and CO-TPD results indicated that desorption amounts increased significantly in all NiO/K-AlSixOy catalysts relative to those of NiO/K-SiO2 and NiO/K-Al2O3, and the adsorption amount increased with the Si/Al ratio. PSR results showed that the NiO/K-AlSixOy catalyst exhibited much better stability than the NiO/K-SiO2 and NiO/K-Al2O3 catalysts. This study confirms the following facts: when the acidity is appropriately adjusted for the catalyst, adsorption of the reaction gas increases, which eventually increases the reaction rate and also inhibits strong sintering between the nickel and the Al2O3 support. As a result, deterioration of the catalyst can be reduced. |
Databáze: | OpenAIRE |
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