郭新闻

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教授

博士生导师

硕士生导师

主要任职:盘锦校区管委会副主任兼教学与科研工作部部长

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工学院

学科:工业催化. 物理化学

办公地点:化工实验楼B427

联系方式:18641143913

电子邮箱:guoxw@dlut.edu.cn

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Low Temperature CO2 Methanation: ZIF-67-Derived Co-Based Porous Carbon Catalysts with Controlled Crystal Morphology and Size

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论文类型:期刊论文

发表时间:2017-09-01

发表刊物:ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录刊物:Scopus、SCIE、EI

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.