Citation: Zhou Junhui, Ao Zhimin, An Taicheng. DFT Study of the Decomposition Mechanism of H₂S on V-Decorated Ti₂CO₂ Single-Atom Catalyst[J]. Acta Physico-Chimica Sinica, ;2021, 37(8): 200708. doi: 10.3866/PKU.WHXB202007086 shu

DFT Study of the Decomposition Mechanism of H₂S on V-Decorated Ti₂CO₂ Single-Atom Catalyst

Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China

Corresponding author: Ao Zhimin, zhimin.ao@gdut.edu.cn
Received Date: 28 July 2020
Revised Date: 18 August 2020
Accepted Date: 28 August 2020
Available Online: 31 August 2020
Fund Project: This work was supported by National Natural Science Foundation of China (21777033), Science and Technology Program of Guangdong Province, China (2017B020216003), Local Innovative and Research Team Project of Guangdong Pearl River Talents Program (2017BT01Z032), and the Innovation Team Project of Guangdong Provincial Department of Education (2017KCXTD012)Local Innovative and Research Team Project of Guangdong Pearl River Talents Program 2017BT01Z032Science and Technology Program of Guangdong Province, China 2017B020216003National Natural Science Foundation of China 21777033the Innovation Team Project of Guangdong Provincial Department of Education 2017KCXTD012

In-depth understanding of the mechanisms of hydrogen sulfide (H₂S) adsorption on catalysts during desulfurization from industrial waste gas streams is important for developing effective catalysts to be used in the decomposition of H₂S. In this work, the dissociation behavior of H₂S adsorbed on a single-atom catalyst (Ti or V-decorated Ti₂CO₂ surface) was investigated by performing density functional theory (DFT) calculations. The corresponding diffusion behavior revealed that Ti or V atoms could be dispersed on the Ti₂CO₂ monolayer, without aggregation in the form of single atoms. In addition, analyses of the partial density of states (PDOS), Hirshfeld charges, and electron density difference indicated that the decorated Ti or V atoms led to charge redistribution on the Ti₂CO₂ surface and significantly improved the interaction between the H₂S gas molecules and Ti₂CO₂, thereby enhancing the catalytic activity of V/Ti₂CO₂. In order to gain a deeper understanding of the mechanism of H₂S decomposition (H₂S → HS* + H* → H₂ + S*), a comparative analysis of the results for the decomposition of H₂S on the Ti/Ti₂CO₂ and V/Ti₂CO₂ surfaces was carried out. The catalytic dissociation behavior of H₂S is explained as follows: once H₂S is adsorbed on the V/Ti₂CO₂ or Ti/Ti₂CO₂ surface, it spontaneously dissociates into HS*/H* without any energy barrier on the catalyst surface. Subsequently, the V atoms would not only promote the cleavage of the H-S bond, but also play a major role in the formation of S atoms. Moreover, the rate-limiting step for the entire process proceeded on the Ti/Ti₂CO₂ surface with an energy barrier of 0.86 eV, while that for V/Ti₂CO₂ was 0.28 eV, indicating that the H₂S molecules easily dissociated into S and H₂ on the V/Ti₂CO₂ surface at room temperature. The reaction time for H₂S decomposition on the V/Ti₂CO₂ surface at 500 K was 65.79 ns, which was almost two orders of magnitude higher than that at room temperature. Thus, the decomposition of H₂S on the V-doped Ti₂CO₂ surface is associated very fast kinetics. Furthermore, the S atoms can form elemental sulfur with aggregation on the V/Ti₂CO₂ surface to promote recycling reactions. Compared with previously reported catalytic systems, the single-atom catalyst (SAC) V/Ti₂CO₂ catalyst has greater application prospects in terms of sustainable economy or removal efficiency for H₂S treatment. Our results suggest that V-doped Ti₂CO₂ is an excellent candidate for a highly effective non-noble metal catalyst applicable to H₂S decomposition.
- MXene,
- SACs,
- H₂S dissocoation,
- Ti₂CO₂,
- DFT
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DFT Study of the Decomposition Mechanism of H₂S on V-Decorated Ti₂CO₂ Single-Atom Catalyst