Effect of structural promoters on the catalytic performance of cobalt-based catalysts during natural gas decomposition to hydrogen and carbon nanotubes
| Autor: | M. M. Yonis, Ateyya A. Aboul-Enein, Ahmed E. Awadallah, Ahmed K. Aboul-Gheit |
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| Rok vydání: | 2015 |
| Předmět: |
Thermogravimetric analysis
Materials science Catalyst support Organic Chemistry Industrial catalysts Thermal decomposition Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Nanomaterial-based catalyst 0104 chemical sciences Catalysis chemistry General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Cobalt Hydrogen production |
| Zdroj: | Fullerenes, Nanotubes and Carbon Nanostructures. 24:181-189 |
| ISSN: | 1536-4046 1536-383X |
| Popis: | Catalytic thermal decomposition of natural gas to CO/CO2-free hydrogen production was studied over cobalt catalysts supported on Al2O3, MgO, and SiO2. The physico-chemical properties of the fresh catalysts were investigated by X-ray diffraction (XRD), temperature-programmed reduction (TPR), and surface area. In addition, the morphological structure of as-deposited carbon over the spent catalysts was characterized by transmission electron microscope (TEM), Raman spectroscopy, thermogravimetric analysis, and XRD. The obtained results proved that the catalytic activity and longevity of the cobalt-based catalysts strongly depended on the nature of the applied support. Among the catalysts tested, the Co/Al2O3 catalyst exhibited the highest activity and stability due to the higher dispersion and stabilization of cobalt particles because of formation of CoAl2O3 spinel phase. The lower activity of Co/SiO2 catalyst is mainly attributed to the aggregation of cobalt metal particles because of weak metal–supp... |
| Databáze: | OpenAIRE |
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