Template-free synthesis of hierarchically macro-mesoporous Mn-TiO<sub>2</sub> catalysts for selective reduction of NO with NH<sub>3</sub>

doi:10.1007/s11705-017-1679-2

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (1) : 43-49 https://doi.org/10.1007/s11705-017-1679-2

RESEARCH ARTICLE

Template-free synthesis of hierarchically macro-mesoporous Mn-TiO₂ catalysts for selective reduction of NO with NH₃

Zhao Peng¹, Li-Hua Chen¹(

), Ming-Hui Sun¹, Pan Wu¹, Chang Cai¹, Zhao Deng¹, Yu Li¹, Wei-Hong Zheng², Bao-Lian Su^1,^3,⁴

¹. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
². State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
³. Laboratory of Inorganic Materials Chemistry, Univernisity of Namur, Namur B-5000, Belgium
⁴. Clare Hall, University of Cambridge, Cambridge, CB2 1EW, UK

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Abstract

This study described a template-free method for the synthesis of hierarchically macro-mesoporous Mn-TiO₂ catalysts. The promoting effect of Mn doping and the hierarchically macro-mesoporous architecture on TiO₂ based catalysts was also investigated for the selective reduction of NO with NH₃. The results show that the catalytic performance of TiO₂ based catalysts was improved greatly after Mn doping. Meanwhile, the Mn-TiO₂ catalyst with the hierarchically macro-mesoporous architecture has a better catalytic activity than that without such an architecture.

Keywords titania hierarchically macro-mesoporous structure Mn-doping selective catalytic reduction

Corresponding Author(s): Li-Hua Chen,Wei-Hong Zheng,Bao-Lian Su

Just Accepted Date: 17 August 2017 Online First Date: 31 October 2017 Issue Date: 26 February 2018

Cite this article:

Zhao Peng,Li-Hua Chen,Ming-Hui Sun, et al. Template-free synthesis of hierarchically macro-mesoporous Mn-TiO₂ catalysts for selective reduction of NO with NH₃[J]. Front. Chem. Sci. Eng., 2018, 12(1): 43-49.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-017-1679-2
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I1/43

Fig.1 SEM images of (a, b) hierarchically macro-mesoporous TiO₂ and (c, d) hierarchically macro-mesoporous Mn-TiO₂-0.15

Fig.2 (a) TEM image, (b) HRTEM micrographs, and (c?f ) EDS mapping of Mn-TiO₂-0.15

Fig.3 XRD patterns of Mn-TiO₂ samples with different molar ratios of Mn to Ti. (A) Pure hierarchically maco-mesoporous TiO₂; (B) Mn-TiO₂-0.05; (C) Mn-TiO₂-0.1; (D) Mn-TiO₂-0.15; (E) Mn-TiO₂-0.2; (F) Mn-TiO₂-0.25; (G) Mn-TiO₂-0.3; (H) Con-Mn-TiO₂-0.15

Tab.1 Porous structure parameters of Mn-TiO₂—x catalysts

Fig.4 (a) N₂ adsorption-desorption isotherms and (b) the corresponding size distribution curves of the Mn-TiO₂ samples. (A) Mn-TiO₂-0; (B) Mn-TiO₂-0.05; (C) Mn-TiO₂-0.1; (D) Mn-TiO₂-0.15; (E): Mn-TiO₂-0.2; (F) Mn-TiO₂-0.25; (G) Mn-TiO₂-0.3

Fig.5 XPS spectra of Mn-TiO₂–0.15. (a) Full; (b) Mn 2p

Fig.6 Catalytic activity measurements for the NO conversion over Mn-TiO₂-x

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