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The Effects of $CeO_{2}$ and Co Doping on the Properties and the Performance of the $Ni/Al_{2}O_{3}$-MgO Catalyst for the Combined Steam and $CO_{2}$ Reforming of Methane Using Ultra-Low Steam to Carbon Ratio
| Content Provider | MDPI |
|---|---|
| Author | Dharmasaroja, Nichthima Ratana, Tanakorn Tungkamani, Sabaithip Sornchamni, Thana Simakov, David S. A. Phongaksorn, Monrudee |
| Copyright Year | 2020 |
| Description | In this paper, the 10 wt% Ni/Al2O3-MgO (10Ni/MA), 5 wt% Ni-5 wt% Ce/Al2O3-MgO (5Ni5Ce/MA), and 5 wt% Ni-5 wt% Co/Al2O3-MgO (5Ni5Co/MA) catalysts were prepared by an impregnation method. The effects of CeO2 and Co doping on the physicochemical properties of the Ni/Al2O3-MgO catalyst were comprehensively studied by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed reduction (CO2-TPD), and thermogravimetric analysis (TGA). The effects on catalytic performance for the combined steam and CO2 reforming of methane with the low steam-to-carbon ratio (S/C ratio) were evaluated at 620 °C under atmospheric pressure. The appearance of CeO2 and Co enhanced the oxygen species at the surface that decreased the coke deposits from 17% for the Ni/MA catalyst to 11–12% for the 5Ni5Ce/MA and 5Ni5Co/MA catalysts. The oxygen vacancies in the 5Ni5Ce/MA catalyst promoted water activation and dissociation, producing surface oxygen with a relatively high H2/CO ratio (1.6). With the relatively low H2/CO ratio (1.3), the oxygen species at the surface was enhanced by CO2 activation-dissociation via the redox potential in the 5Ni5Co/MA catalyst. The improvement of H2O and CO2 dissociative adsorption allowed the 5Ni5Ce/MA and 5Ni5Co/MA catalysts to resist the carbon formation, requiring only a low amount of steam to be added. |
| Starting Page | 1450 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal10121450 |
| Journal | Catalysts |
| Issue Number | 12 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-12-11 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Applied Chemistry Combined Steam and Co2 Reforming of Methane Bimetallic Catalysts Metal Dispersion Coking Resistance Syngas Production Hydrogen Production |
| Content Type | Text |
| Resource Type | Article |
