Synthesis of Mesoporous Composite Oxides for the Catalysis of NH3-SCR

doi:10.15541/jim20150100

Abstract

Abstract:

A novel mesoporous ZrO₂-TiO₂ (ZT) based multi-component composite oxide catalyst V₂O₅-WO₃-CuO- Al₂O₃/ZrO₂-TiO₂ (VWCuAl/ZT) was successfully synthesized by one-pot hydrothermal method using both Brij-35 and P123 as composite template. The results indicated that the active species of V₂O₅, WO₃, CuO and Al₂O₃ could be homogeneously dispersed into mesoporous ZrO₂-TiO₂ catalyst carrier. Compared with the reference samples of non-mesoporous I-VWCuAl/ZT and the traditional commercial catalyst V₂O₅-WO₃/TiO₂(V-W/Ti), the prepared VWCuAl/ZT showed a superior low-temperature catalytic activity and high stability over the reaction of NH₃-SCR of NO, especially high catalytic efficacy for NO reduction within a wide temperature range of between 200℃ to 500℃.

Key words: hydrothermal, mesoporous ZrO2-TiO2, VWCuAl/ZT, NH3-SCR, NO

CLC Number:

TQ174

CHEN Ying, ZHOU Xiao-Xia, WANG Jin, XIE Zhi-Guo, CHEN Hang-Rong. Synthesis of Mesoporous Composite Oxides for the Catalysis of NH₃-SCR[J]. Journal of Inorganic Materials, 2015, 30(11): 1155-1160.

Figures/Tables 8

Fig. 1 N2 adsorption/desorption isotherms of different catalysts and catalyst support ZT

Table 1 Texture properties of different catalysts and catalyst support ZT

Sample	ZT	VWCuAl/ZT	I-VWCuAl/ZT
S_BET/(m²•g^-1)	99	102	42
Pore size /nm	35.8	14.9	-
V_total/(cm³•g^-1)	0.71	0.36	-

Fig. 2 XRD patterns of mesoporous ZT support and VWCuAl/ ZT catalyst

Fig. 3 Typical TEM images and the corresponding selected area electron diffraction (SAED) pattern (inset) of mesoporous ZT support (a) and VWCuAl/ZT catalyst (b), and EDS spectrum (c) corresponding to (b) as well as elements weight percentage of VWCuAl/ZT (inset)

Fig. 4 (a) SEM image, (b) STEM image and (c) corresponding elements mapping of VWCuAl/ZT catalyst

Fig. 5 H2-TPR profiles of the prepared VWCuAl/ZT and commercial catalysts

Fig. 6 Comparison of NO conversion over the VWCuAl/ ZT, references commercial catalyst and I-VWCuAl/ZT catalyst

Fig. 7 Reusability of the sample VWCuAl/ZT

References 21

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Synthesis of Mesoporous Composite Oxides for the Catalysis of NH₃-SCR

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