Mn-promoted Ni/Al2O3 catalysts for stable carbon dioxide reforming of methane
SCIE
SCOPUS
- Title
- Mn-promoted Ni/Al2O3 catalysts for stable carbon dioxide reforming of methane
- Authors
- Seok, SH; Choi, SH; Park, ED; Han, SH; Lee, JS
- Date Issued
- 2002-07-01
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Abstract
- Based on previous observation that the addition of manganese onto Ni/Al2O3 catalysts reduced the coke formation in the carbon dioxide reforming of methane, effects of the preparation method for Mn-promoted Ni/Al2O3 catalysts on the catalytic activity and stability were investigated. A coprecipitated catalyst, Ni-MnOx/MnAl2O4, showed higher coke resistance and more stable activity than an impregnated Ni/MnO/gamma-Al2O3 catalyst and the well-known Ni0.03Mg0.97O catalyst at 923 K with a feed gas ratio CH4/CO2 of 1 without a diluent gas. In coprecipitated Ni-MnOx/MnAl2O4 catalysts, MnAl2O4, gamma-Al2O3, and Ni(0) were observed as major crystalline phases with XRD and potassium was detected on the surface with EPMA. Comparison of H-2 chemisorption and XRD suggested that the surface of large metallic nickel particles was partly blocked by manganese oxides, and the structure was confirmed by XAFS. For impregnated Ni/MnO/gamma-Al2O3 catalysts, addition of potassium stabilized its catalytic activity further, to the level achieved by coprecipitated Ni-MnOx/MnAl2O4 catalysts. These results indicate that very stable Ni/Al2O3 catalysts for the carbon dioxide reforming of methane can be prepared by addition of both potassium and manganese as promoters. (C) 2002 Elsevier Science (USA).
- Keywords
- CO2 reforming; methane; nickel catalysts; manganese; potassium; coke deposition; SOLID-SOLUTION CATALYSTS; SYNTHESIS GAS; NICKEL-CATALYSTS; CO2; CH4; DEPOSITION; PERFORMANCE; SYSTEM; METALS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19015
- DOI
- 10.1006/JCAT.2002.36
- ISSN
- 0021-9517
- Article Type
- Article
- Citation
- JOURNAL OF CATALYSIS, vol. 209, no. 1, page. 6 - 15, 2002-07-01
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.