Chinese Journal of Catalysis ›› 2023, Vol. 47: 214-221.DOI: 10.1016/S1872-2067(22)64202-5

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Synergy between single atoms and nanoclusters of Pd/g-C3N4 catalysts for efficient base-free CO2 hydro-genation to formic acid

Eun Hyup Kim, Min Hee Lee, Jeehye Kim, Eun Cheol Ra, Ju Hyeong Lee, Jae Sung Lee*()   

  1. School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
  • Received:2022-10-29 Accepted:2022-11-20 Online:2023-04-18 Published:2023-03-20
  • Contact: *E-mail: jlee1234@unist.ac.kr (J. Lee).

Abstract:

In base-free CO2 hydrogenation to HCOOH over C3N4-supported Pd catalysts, a synergy between Pd single atoms and nanoclusters has been discovered by observing the highest catalytic activity when an optimum ratio of the two Pd states is present in the catalyst. It is demonstrated that Pd clusters are mainly involved in H2 activation by dissociative adsorption, while single atoms are more effective for CO2 activation. Thus, at an optimum single atom ratio (number of single atoms/number of single atoms + nanoclusters) of 41%, the catalyst shows the highest activity, which is superior to all Pd catalysts reported previously in the literature under the similar reaction conditions.

Key words: Base-free CO2 hydrogenation to HCOOH, Pd/g-C3N4, Single atom catalyst, Nanocluster catalyst, Synergistic effect