Selective production of aromatics from CO2
- 26 November 2018
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Catalysis Science & Technology
- Vol. 9 (3), 593-610
- https://doi.org/10.1039/c8cy02024h
Abstract
Direct catalytic hydrogenation of CO2 to value-added aromatics, particularly the desirable para-xylene, not only provides a complementary route to the aromatics market but also helps reduce emissions of the greenhouse gas CO2. Herein, we report a composite Na/Fe and HZSM-5 catalyst system used for the direct and selective production of aromatics from CO2. Over the composite catalyst, the selectivity to aromatics in liquid hydrocarbons could reach over 94% under industrially relevant conditions, and the selectivity to para-xylene in total xylenes remarkably increased from 24–26% to 70% as HZSM-5 zeolite was coated with SiO2. Experiments and DFT calculations confirmed that the Na-promoted Fe catalyst and HZSM-5 with high Brønsted acidity are key factors for enhancing the CO2 conversion and aromatics synthesis. Specifically, SiO2-coated HZSM-5 can suppress the isomerization of para-xylene and para-ethyltoluene, which are preferentially formed in the inner channels of HZSM-5, and over a 100 h test, the composite catalyst showed highly stable CO2 conversion with relatively stable aromatics synthesis. Interestingly, in the case of SiO2-coated HZSM-5, the light olefins (C2 –C4 ) remained largely in the gas phase rather than becoming isomerized and hydrogenated into light paraffins. This study opens a new way to reduce CO2 emissions via the efficient production of aromatics over a simple composite catalyst system.Keywords
Funding Information
- National Natural Science Foundation of China (21606108, 21576119, 21878127)
- Natural Science Foundation of Jiangsu Province (BK20160161, BK20151125)
This publication has 62 references indexed in Scilit:
- Ni/CeO2 catalysts with high CO2 methanation activity and high CH4 selectivity at low temperaturesInternational Journal of Hydrogen Energy, 2012
- Recent advances in catalytic hydrogenation of carbon dioxideChemical Society Reviews, 2011
- Controllable Fischer-Tropsch Synthesis by In Situ-Produced 1-OlefinsChemCatChem, 2010
- Heterogeneous catalytic CO2 conversion to value-added hydrocarbonsEnergy & Environmental Science, 2010
- Elucidation of reaction network and effective control of carbon number distribution in the three phase Fischer–Tropsch synthesisApplied Catalysis A: General, 2007
- Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic propertiesMicroporous and Mesoporous Materials, 2007
- Supercritical phase process for direct synthesis of middle iso-paraffins from modified Fischer–Tropsch reactionCatalysis Today, 2005
- Structure and Fischer–Tropsch performance of iron–manganese catalyst incorporated with SiO2Applied Catalysis A: General, 2005
- Effect of potassium promoter on precipitated iron-manganese catalyst for Fischer?Tropsch synthesisApplied Catalysis A: General, 2004
- Reversible hydrogen chemisorption at near-ambient temperatures and pressures on unsaturated and aromatic hydrocarbon complexes with finely divided metalsInternational Journal of Hydrogen Energy, 2003