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The Initial Stages of NH3 and NO Adsorption On (Mo2O5)2+/HZSM-5 with Two Adjacent Unsaturated fiveFold Mo Sites in SCR Reaction: A Cluster DFT Study

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Abstract

The density functional theory (DFT) has been employed to investigate the initial stages of NH3 and NO adsorption on both Lewis and Brønsted acid sites of (Mo2O5)2+/HZSM-5 by using cluster models. The calculated results reveal that NH3 can strongly adsorb on both Lewis and Brønsted acid sites in the form of coordinated NH3 and NH4 + and the corresponding adsorption energies are − 48.16 and − 37.28 kcal/mol, respectively. Compared with NH3, NO represents much poorer adsorption ability on both Lewis and Brønsted acid sites. Upon NH3 adsorption on Lewis acid site, its connected Mo site converts to sixfold coordination and octahedral structure while the other Mo site still remains fivefold coordination and tetrahedral structure and electronic structure. However, NH3 adsorption on Brønsted acid site leads to the decrease of stability and the increase of reactivity of the two fivefold coordinated Mo sites. Along the proposed reaction mechanisms, the results of NO adsorption on (Mo2O5)2+/HZSM-5 with adsorbed NH3 indicate that NO can be adsorbed on the second unsaturated fivefold Mo site for both Lewis and Brønsted acid sites and be activated, which weaken the interaction between adsorbed NH3 species and (Mo2O5)2+/HZSM-5.

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Acknowledgements

The authors thank reviewers for their valuable suggestions and the financial support from National Natural Science Foundation of China (No. 21073131), State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology (No. MKX201301), the Key Technologies R&D Program of Shanxi Province of China (No. 20140313002-2) and Youth Foundation of Taiyuan University of Technology (No. 1205-04020202).

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Authors and Affiliations

  1. College of Textile Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, People’s Republic of China

    Zhifeng Yan, Sheng Shi, Sha Li & Xiaogang Chen

  2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, People’s Republic of China

    Zhe Li

  3. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, People’s Republic of China

    Zhijun Zuo

  4. School of Materials, University of Manchester, Manchester, M13 9PL, UK

    Xiaogang Chen

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  1. Zhifeng Yan
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Yan, Z., Shi, S., Li, Z. et al. The Initial Stages of NH3 and NO Adsorption On (Mo2O5)2+/HZSM-5 with Two Adjacent Unsaturated fiveFold Mo Sites in SCR Reaction: A Cluster DFT Study. Catal Lett 147, 1006–1018 (2017). https://doi.org/10.1007/s10562-017-2000-1

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