Pyrolyzing ZIF-8 to N-doped porous carbon facilitated by iron and potassium for CO2 hydrogenation to value-added hydrocarbons. (May 2018)

• Record Type: Journal Article
• Authors: Liu, Junhui; Sun, Yanwei; Jiang, Xiao; Zhang, Anfeng; Song, Chunshan; Guo, Xinwen
• Is Part Of: Journal of CO₂ utilization. Volume 25(2018)
• Page Start: 120
• Page End: 127
• Publication Date: 2018-05
• Subjects: CO2 hydrogenation -- N-doped porous carbon -- ZIF-8 -- Fe@C on carbon matrix -- Value-added hydrocarbons; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2018.03.015
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: The iron-based catalysts derived from modified ZIF-8 were prepared for CO2 hydrogenation. The Fe@C and metal nanoparticles inserted hollow sphere structures were obtained by pyrolyzing iron and iron/potassium modified ZIF-8. FeZn-NC and FeZnK-NC exhibited high catalytic activity and selectivity of value-added hydrocarbons. The MOF-derived catalysts showed good stability due to the unique structure. Abstract: The iron-based catalysts derived from modified ZIF-8 were prepared, characterized, and applied to CO2 hydrogenation reaction. The addition of iron and iron/potassium evidently tuned the pyrolysis behavior by forming carbon encapsulated iron nanoparticles and metal nanoparticles inserted hollow sphere, respectively. FeZn-NC and FeZnK-NC exhibited high activity with 29.3% and 34.6% CO2 conversion, respectively. More importantly, the selectivity to value-added hydrocarbons (i.e., C2 –C4 = and C5+ ), which are of great importance to chemical industry and energy, was prominent over these two catalysts, and higher than 54 C-mol%. The FeZn-NC with carbon-encapsulated iron nanoparticles showed a remarkable stability for 126 h on stream, suggesting a promising prospect for industrial application.