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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Base-free CO2 hydrogenation to formic acid over Pd supported on defective carbon nitride modified by microwave and acid treatments

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Title
Base-free CO2 hydrogenation to formic acid over Pd supported on defective carbon nitride modified by microwave and acid treatments
Author
Kim, Eun HyupChoi, Yo HanLee, Min HeeKim, JeehyeKim, Hyung BinKim, Kwang YoungRa, Eun CheolLee, Ju HyeongLee, Jae Sung
Issue Date
2021-04
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF CATALYSIS, v.396, pp.395 - 401
Abstract
Graphitic carbon nitride (g-C3N4) is synthesized via pyrolyzing urea by hybrid microwave annealing (HMA) to support Pd catalyst for direct CO2 hydrogenation to formic acid under a base-free condition. The HMA produces fragmented C3N4 sheets with abundant defects along their edges, because of the high annealing temperature (>900 degrees C) in an extremely short time (<5 min). The acid treatment of C3N4 further reduces its grain sizes forming additional defect sites to anchor small Pd nanoparticles. The modified C3N4 provides ample CO2 adsorption sites relative to C3N4 pyrolyzed by the conventional furnace annealing at 550 degrees C for 4 h. The Pd catalyst supported on the defective C3N4 exhibits the benchmark performance ever reported for base-free CO2-to-HCOOH conversion in terms of both palladium time yield based on total Pd, and turnover frequency based on exposed surface Pd atoms. The enhanced performance is explained by interplay between small Pd nanoparticles and the abundant CO2 supply from nearby defect sites along the edges of the modified C3N4 sheets. (C) 2021 Elsevier Inc. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/53065
URL
https://www.sciencedirect.com/science/article/pii/S0021951721001202?via%3Dihub
DOI
10.1016/j.jcat.2021.03.016
ISSN
0021-9517
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