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

By Wenhui Li, Anfeng Zhang, Xiao Jiang, Zhongmin Liu, C. Song, Xinwen Guo. 2017

136 citations recorded by the source corpus.

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 μm in aqueous solution by cetyltrimethylammonium bromide (CTAB) surfactants. After carbonation in N2 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 cm3/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...

Subfields: Inorganic Chemistry, Materials Chemistry, Process Chemistry and Technology

View Paper: https://www.semanticscholar.org/paper/cb3b72a279a97b76729fd4d7ed13c876c4fe5e02