Low Temperature CO2 Methanation: ZIF-67-Derived Co-Based Porous Carbon Catalysts with Controlled Crystal Morphology and Size
发表时间：2019-03-11
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- 论文类型：
- 期刊论文
- 第一作者：
- Li, Wenhui
- 合写作者：
- Zhang, Anfeng,Jiang, Xiao,Chen, Chen,Liu, Zhongmin,Song, Chunshan,Guo, Xinwen
- 发表时间：
- 2017-09-01
- 发表刊物：
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- 收录刊物：
- Scopus、SCIE、EI
- 文献类型：
- J
- 卷号：
- 5
- 期号：
- 9
- 页面范围：
- 7824-7831
- ISSN号：
- 2168-0485
- 关键字：
- CO2 methanation; Low-temperature; ZIF-67; CTAB; Cobalt
- 摘要：
- A Co-based zeolitic imidazolate framework, ZIF-67, has been utilized as a precursor to obtain Co-based porous carbon catalysts. The obtained catalysts display an outstanding catalytic performance toward the CO2 methanation at low temperature. The ZIF-67 crystal morphology can be controlled from cubic to rhombic dodecahedron, and the original particle sizes can be regulated from 150 nm to 1 mu m in aqueous solution by cetyltrimethylammonium bromide (CTAB) surfactants. After carbonation in N-2 flow, Co-based porous carbon catalysts kept the original ZIF-67 crystal morphology and particle size but differed in the micropore property; the 0.01 wt % CTAB content led to the maximum micropore volume 0.125 cm(3)/g. The Co nanoparticles inside the carbon matrix range between 7 and 20 nm, and they are separated by the graphite-like carbon avoiding the metal sintering effectively. Furthermore, the catalysts with 0.01% CTAB addition exhibited the highest CO2 conversion (52.5%) and CH4 selectivity (99.2%) under the 72000 mL g(-1) h(-1) GHSV (gas hourly space velocity) at 270 degrees C. Noticeably, the Co/PC catalysts performed higher activity and stability than the supported catalysts 20Co/AC. The versatile way offers good prospects for low temperature CO2 methanation and prevents metal sintering effectively.
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- 否
