Effect of Cobalt Oxide Content on the Activity of NiO-Co2O3/γ-Al2O3 Catalyst in the Reaction of Dry Reforming of Methane to Synthesis Gas
| Autor: | Kusman Dossumov, R. H. Turgumbayeva, S. А. Sozynov, Zinfer R. Ismagilov, M. M. Telbayeva, L. K. Myltykbayeva, L. M. Hitsova, А. N. Popova, G. E. Ergazieva |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Materials science General Chemical Engineering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Dry reforming Nanophases lcsh:Chemistry Differential scanning calorimetry Differential thermal analysis General Materials Science Synthesis gas Cobalt oxide Carbon dioxide reforming General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry lcsh:QD1-999 Catalyst 0210 nano-technology Cobalt Methane Syngas Nuclear chemistry |
| Zdroj: | Eurasian Chemico-Technological Journal , Vol 22, Iss 3 (2020) |
| ISSN: | 2522-4867 1562-3920 |
| Popis: | The effect of cobalt oxide content on the activity of NiO-Co2O3/γ-Al2O3 catalyst was investigated in process of dry reforming of methane (DRM) to synthesis gas. It was found that among the studied catalysts the highest activity is shown by the NiO-Co2O3/ γ-Al2O3, where methane conversion is 89%. It was determined by the scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) there are oxides of Ni and Co in the form of nanosized particles on active NiO-Co2O3/γ-Al2O3 catalyst and Co-Ni alloys, formed after the reaction of DRM, the size of 17‒23 nm. Thermogravimetric Analysis (TGA)/ Differential Thermal Analysis (DTA)/ Differential Scanning Calorimetry (DSC) of catalyst showed that the highest weight loss (2.7%) is observed at a degree from 30 to 260 °C after DRM. After heating above 300 °C there is a slight increase in weight, accompanied by an exothermic effect on the DSC curve due to the gas adsorption used to purge the unit. The data indicate the absence of coke formation on NiO-Co2O3/γ-Al2O3 surface. According to TPR-H2 there are peaks at relatively low temperatures of Т1mах = 205 °C and Т2mах = 497 °C on thermally programmed reduction (TPR) TPR-Н2 spectrum of NiO-Со2О3/γ-Al2O3, which are associated with the formation of easily reducible cobalt and nickel oxides, indicating the presence of active and mobile oxygen in the catalyst. These results confirm that the activity of NiO-Co2O3/γ-Al2O3 is due to the formation of nanophases, the presence of active oxygen, and the absence of coke on the catalyst surface. |
| Databáze: | OpenAIRE |
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