Decomposition of methane over alumina supported Fe and Ni–Fe bimetallic catalyst: Effect of preparation procedure and calcination temperature
| Autor: | Ahmed S. Al-Fatesh, Ahmed A. Ibrahim, Anis H. Fakeeha, Hanan Atia, Kulathuiyer Seshan, Wajid Ali Khan, R. Eckelt, Biswajit Chowdhury |
|---|---|
| Přispěvatelé: | Catalytic Processes and Materials |
| Rok vydání: | 2016 |
| Předmět: |
Thermogravimetric analysis
Nanotube Materials science Chemistry(all) Catalyst support Iron Inorganic chemistry chemistry.chemical_element 02 engineering and technology Sol–gel 010402 general chemistry 01 natural sciences Catalysis law.invention lcsh:Chemistry law Calcination Temperature-programmed reduction GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) ComputingMilieux_MISCELLANEOUS General Chemistry 021001 nanoscience & nanotechnology Carbon 0104 chemical sciences chemistry lcsh:QD1-999 Carbon nanotube supported catalyst 0210 nano-technology Methane Hydrogen |
| Zdroj: | Journal of Saudi Chemical Society, Vol 22, Iss 2, Pp 239-247 (2018) Journal of Saudi Chemical Society, 22(2), 239-247. King Saud University |
| ISSN: | 1319-6103 |
| DOI: | 10.1016/j.jscs.2016.05.001 |
| Popis: | Catalytic decomposition of methane has been studied extensively as the production of hydrogen and formation of carbon nanotube is proven crucial from the scientific and technological point of view. In that context, variation of catalyst preparation procedure, calcination temperature and use of promoters could significantly alter the methane conversion, hydrogen yield and morphology of carbon nanotubes formed after the reaction. In this work, Ni promoted and unpromoted Fe/Al2O3 catalysts have been prepared by impregnation, sol–gel and co-precipitation method with calcination at two different temperatures. The catalysts were characterized by X-ray diffraction (XRD), N2 physisorption, temperature programmed reduction (TPR) and thermogravimetric analysis (TGA) techniques. The catalytic activity was tested for methane decomposition reaction. The catalytic activity was high when calcined at 500 °C temperature irrespective of the preparation method. However while calcined at high temperature the catalyst prepared by impregnation method showed a high activity. It is found from XRD and TPR characterization that disordered iron oxides supported on alumina play an important role for dissociative chemisorptions of methane generating molecular hydrogen. The transmission electron microscope technique results of the spent catalysts showed the formation of carbon nanotube which is having length of 32–34 nm. The Fe nanoparticles are present on the tip of the carbon nanotube and nanotube grows by contraction–elongation mechanism. Among three different methodologies impregnation method was more effective to generate adequate active sites in the catalyst surface. The Ni promotion enhances the reducibility of Fe/Al2O3 oxides showing a higher catalytic activity. The catalyst is stable up to six hours on stream as observed in the activity results. |
| Databáze: | OpenAIRE |
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