On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable catalysts for selective catalytic reduction of nitrogen oxides by ammonia

Yufeng Yang, Lihong Zhang, Tao Song, Yixing Huang, Xianglan Xu, Junwei Xu, Xiuzhong Fang, Qing Wang, Haiming Liu, Xiang Wang

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Front. Chem. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (11) : 1741-1754. DOI: 10.1007/s11705-023-2332-x
RESEARCH ARTICLE
RESEARCH ARTICLE

On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable catalysts for selective catalytic reduction of nitrogen oxides by ammonia

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Abstract

Based on monolayer dispersion theory, Co3O4/ZSM-5 catalysts with different loadings have been prepared for selective catalytic reduction of nitrogen oxides by ammonia. Co3O4 can spontaneously disperse on HZSM-5 support with a monolayer dispersion threshold of 0.061 mmol 100 m–2, equaling to a weight percentage around 4.5%. It has been revealed that the quantities of surface active oxygen (O2) and acid sites are crucial for the reaction, which can adsorb and activate NOx and NH3 reactants effectively. Below the monolayer dispersion threshold, Co3O4 is finely dispersed as sub-monolayers or monolayers and in an amorphous state, which is favorable to generate the two kinds of active sites, hence promoting the performance of ammonia selective catalytic reduction of nitrogen oxide. However, the formation of crystalline Co3O4 above the capacity is harmful to the reaction performance. 4% Co3O4/ZSM-5, the catalyst close to the monolayer dispersion capacity, possesses the most abundant active O2 species and acidic sites, thereby demonstrating the best reaction performance in all the samples. It is proposed the optimal Co3O4/ZSM-5 catalyst can be prepared by loading the capacity amount of Co3O4 onto HZSM-5 support.

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Keywords

Co3O4/ZSM-5 / NOx-SCR by NH3 / monolayer dispersion threshold effect / surface acid sites / surface active O2 anions

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Yufeng Yang, Lihong Zhang, Tao Song, Yixing Huang, Xianglan Xu, Junwei Xu, Xiuzhong Fang, Qing Wang, Haiming Liu, Xiang Wang. On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable catalysts for selective catalytic reduction of nitrogen oxides by ammonia. Front. Chem. Sci. Eng., 2023, 17(11): 1741‒1754 https://doi.org/10.1007/s11705-023-2332-x

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Competing interests

The authors declare that they have no competing interests.

Acknowledgements

The authors acknowledge deeply the financial supporting by the National Natural Science Foundation of China (Grant Nos. 21962009, 22172071, 22102069, 22062013), the Natural Science Foundation of Jiangxi Province (Grant Nos. 20202BAB203006, 20181ACB20005), the Key Laboratory Foundation of Jiangxi Province for Environment and Energy Catalysis (Grant No. 20181BCD40004).

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Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-023-2332-x and is accessible for authorized users.

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