Influence of Supports on the Catalytic Activity and Coke Resistance of Ni Catalyst in Dry Reforming of Methane
- Authors
- Song, Da Hye; Jung, Un Ho; Kim, Young Eun; Im, Hyo Been; Lee, Tae Ho; Lee, Ki Bong; Koo, Kee Young
- Issue Date
- 2월-2022
- Publisher
- MDPI
- Keywords
- dry reforming of methane; syngas; coke resistance; Ni catalyst; MgO-Al2O3
- Citation
- CATALYSTS, v.12, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- CATALYSTS
- Volume
- 12
- Number
- 2
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/140471
- DOI
- 10.3390/catal12020216
- ISSN
- 2073-4344
- Abstract
- The dependence of the catalytic activity and coke resistance of Ni-based catalysts on the support type was investigated in the dry reforming of methane (DRM). Catalysts were prepared using incipient wetness impregnation and analyzed using ICP-OES, BET-BJH, XRD, H-2-chemisorption, H-2-TPR, and CO2-TPD. DRM was performed at 600-750 degrees C at 144,000 mL/g(cat)center dot h of GHSV (CH4/CO2/N-2 = 1/1/1). Ni/Al2O3 and Ni/MgO catalysts formed NiAl2O4 and NiO-MgO solid solutions, respectively, owing to strong binding between the metal and support. In contrast, MgO-Al2O3 and MgAl2O4 supports suppressed NiAl2O4 and NiO-MgO solid solution formation, due to Mg addition, with high metal dispersions of 4.6 and 6.6%, respectively. In the DRM reaction, the Ni/MgO-Al2O3 and Ni/MgAl2O4 catalysts showed high CH4 conversions of 78.1 and 76.8%, respectively, compared with Ni/Al2O3 and Ni/MgO at 750 degrees C. A stability test was performed at 600 degrees C for 20 h. A coke study of the spent catalysts was performed using SEM and TGA. Alkaline-earth metal-containing catalysts Ni/MgO-Al2O3 and Ni/MgAl2O4 with strong CO2 adsorption properties showed 20 wt% reduction in carbon deposition compared to commercial catalysts. Therefore, the support and basic properties of the catalyst significantly influenced the catalyst performance and coke resistance in the DRM.
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