Journal
ACS CATALYSIS
Volume 10, Issue 11, Pages 6389-6401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c00810
Keywords
CO2 hydrogenation; single-walled carbon nanotubes; heavy olefins; iron; potassium; multiwalled carbon nanotubes
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Funding
- National Key R&D program of China [2018YFB0604501]
- National Natural Science Foundation of China [21872035]
- International Joint Laboratory on Resource Chemistry (IJLRC)
- Science and Technology Commission of Shanghai Municipality [19DZ2270100]
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The iron-potassium catalysts supported on single- and multiwalled carbon nanotubes, FeK/SWNTs and FeK/MWNTs, were fabricated, characterized, and evaluated in CO2 hydrogenation. The FeK/SWNTs catalyst outperforms the FeK/MWNTs catalyst in selectivity during CO2 hydrogenation to olefins with the selectivities being 62.3% and 52.4%, respectively. Of particular interest is that the FeK/SWNTs catalyst is more selective toward heavy olefins (C-5+(=) selectivity, 39.8%), whereas the FeK/MWNTs catalyst is more selective to light olefins (C-2-C-4(=) selectivity, 30.7%). The FeK/SWNTs catalyst also affords much lower selectivities to undesired CO and CH4 in addition to higher productivity of hydrocarbons, thus resulting in an unprecedentedly high productivity of heavy olefins of 27.6 mu mol(CO2) g(Fe)(-1) s(-1). The more electron-enriched exterior of SWNTs with large curvature, higher abundance of Hagg carbide, and stronger interaction with light olefins may rationalize the superior catalytic behavior of the FeK/SWNTs catalyst in CO2 hydrogenation to heavy olefins. The FeK/SWNTs catalyst also exhibited a minor change in catalytic performance in a 120 h stability test, highlighting SWNTs as a promising catalyst support for producing value-added chemicals from greenhouse gas CO2.
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