The Effect of CeO2 Preparation Method on the Carbon Pathways in the Dry Reforming of Methane on Ni/CeO2 Studied by Transient Techniques
| Autor: | Damaskinos, Constantinos M., Vasiliades, Michalis A., Stathopoulos, Vassilis N., Efstathiou, Angelos M. |
|---|---|
| Přispěvatelé: | Stathopoulos, Vassilis N. [0000-0001-8575-2313], Vasiliades, Michalis A. [0000-0002-1568-1158], Efstathiou, Angelos M. [0000-0001-8393-8800], Damaskinos, Constantinos M. [0000-0003-0107-4071] |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Inorganic chemistry
chemistry.chemical_element lattice oxygen 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Oxygen Catalysis Methane lcsh:Chemistry chemistry.chemical_compound Boudouard reaction nickel Reactivity (chemistry) lcsh:TP1-1185 Physical and Theoretical Chemistry isotopes Carbon dioxide reforming Thermal decomposition 021001 nanoscience & nanotechnology cerium dioxide 0104 chemical sciences DRM chemistry lcsh:QD1-999 Carbon dioxide 0210 nano-technology Carbon transient experiments |
| Zdroj: | Catalysts Volume 9 Issue 7 Catalysts, Vol 9, Iss 7, p 621 (2019) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal9070621 |
| Popis: | The present work discusses the effect of CeO2 synthesis method (thermal decomposition (TD), precipitation (PT), hydrothermal (HT), and sol-gel (SG)) on the carbon pathways of dry reforming of methane with carbon dioxide (DRM) applied at 750 ° C over 5 wt% Ni/CeO2. In particular, specific transient and isotopic experiments (use of 13CO, 13CO2, and 18O2) were designed and conducted in an attempt at providing insights about the effect of support&rsquo s preparation method on the concentration (mg gcat&minus 1), reactivity towards oxygen, and transient evolution rates (&mu mol gcat&minus 1 s&minus 1) of the inactive carbon formed under (i) CH4/He (methane decomposition), (ii) CO/He (reverse Boudouard reaction), and (iii) the copresence of the two (CH4/CO/He, use of 13CO). Moreover, important information regarding the relative contribution of CH4 and CO2 activation routes towards carbon formation under DRM reaction conditions was derived by using isotopically labelled 13CO2 in the feed gas stream. Of interest was also the amount, and the transient rate, of carbon removal via the participation of support&rsquo s labile active oxygen species. |
| Databáze: | OpenAIRE |
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