Preparation and Characterization of Ternary SCR Catalysts Consisted of Transition Metal Oxide, Zirconia and Ceira

doi:10.11901/1005.3093.2015.088

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 123-130 DOI: 10.11901/1005.3093.2015.088

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Preparation and Characterization of Ternary SCR Catalysts Consisted of Transition Metal Oxide, Zirconia and Ceira

LIU Haidi^**(

), LI Weiman, LI Wenhui, CHEN Yunfa

(State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China)

Cite this article:

LIU Haidi, LI Weiman, LI Wenhui, CHEN Yunfa. Preparation and Characterization of Ternary SCR Catalysts Consisted of Transition Metal Oxide, Zirconia and Ceira. Chinese Journal of Materials Research, 2016, 30(2): 123-130.

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Abstract

Ternary selective catalytic reduction (SCR) catalysts composed of transition metal oxide M_xO_y (M=Cr, Mn, V, Fe, Cu, Co), zirconia and ceria were prepared. The catalysts were characterized in terms of surface area, pore structure, crystal structure, element valence state, type of acidic sites and redox ability and catalytical properties by means of low-temperature N₂ adsorption (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH₃-temperature programmed desorption (NH₃-TPD) and H₂-temperature programmed reduction (H₂-TPR) methods. The results show that the ternary catalyst of Mn-Zr-Ce oxides exhibited good low-temperature (<200℃) activity, but poor high-temperature (>250℃) activity. The ternary catalyst of Cr-Zr-Ce oxides showed good and stable activity in the whole temperature range 100-300℃. The ternary catalyst of V-Zr-Ce oxides was very poor in catalyzing the SCR reaction at low temperature (<200℃), but exhibited better performance at high temperature (around 300℃). The sulphur-tolerance of the as-made samples were also investigated. All the phenomena observed were explained on the basis of the characterization results of the as-made samples.

Key words: inorganic non-metallic materials ceria zirconia transition metal NOx SCR

Received: 15 February 2015

ZTFLH:

TB321

Fund: *Supported by the Strategic Priority Research Program B of Chinese Academy of Sciences No.XDB05050400, National Natural Science Foundation of China No.21107111, and Knowledge Innovation Project of Chinese Academy of Sciences No.KZCX2-EW-403

About author: **To whom correspondence should be addressed, Tel: (010)82544893, E-mail: liuhaidi@ipe.ac.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.088 OR https://www.cjmr.org/EN/Y2016/V30/I2/123

Table 1 BET surface area, average pore size and pore volume of the as-made samples doped with various metal ions

Fig.1 XRD spectra of sample

Fig.2 Catalytic results of various sample in temperature range of 100-300℃

Fig.3 H_2-TPR profiles of various samples

Fig.4 NH₃-TPD profiles of various samples

Fig.5 2p XPS spectra of various transition metals in as-made samples

Fig.6 3d XPS spectra of Ce in various samples

Fig.7 Sulphur resistance of sample Cr-Zr-Ce (a), Mn-Zr-Ce (b) and V-Zr-Ce (c)

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