Promotional Effect of Tungsten Incorporation on Catalytic Performance of Ti0.8Zr0.2Ce0.2O2.4/Al2O3-TiO2-SiO2 for Selective Catalytic Reduction of NOx by NH3

doi:10.15541/jim20140196

Abstract

Abstract:

Series TZC/ATS catalysts and the tungsten-added samples, with Ti_0.8Zr_0.2Ce_0.2O_2.4 (TZC for short) as active component and Al₂O₃-TiO₂-SiO₂ (ATS for short) as catalyst carrier, were prepared by extrusion method. Effects of tungsten incorporation on catalytic performance and tolerance towards K₂O and CaO poisoning of TZC/ATS for deNO_x by NH₃ selective catalytic reduction (NH₃-SCR) were mainly studied, and anti K₂O and CaO poisoning abilities between the TZCW_0.4/ATS and the V₂O₅(WO₃)/TiO₂ were comparatively analyzed. Moreover, the specific surface, solid-phase structure, morphology and surface acidity of the catalysts were characterized by techniques of N₂-BET, XRD, SEM and NH₃-TPD, respectively. Results showed that the TZCW_0.4/ATS catalyst exhibited the highest catalytic activity and the best stability for deNO_x by NH₃-SCR when the Ti/Zr/Ce/W molar ratio of the active component was 4:1:1:0.4. Furthermore, tungsten incorporation greatly enhanced the anti K₂O and CaO poisoning abilities of the TZCW_0.4/ATS catalyst, and these anti-poisoning abilities of the TZCW_0.4/ATS were much stronger than those of the V₂O₅(WO₃)/TiO₂. The promotional effect on catalytic deNO_x performance was caused by increased specific surface area and enhanced surface acidity of the TZCW_0.4/ATS catalyst after tungsten incorporation.

Key words: Ti0.8Zr0.2Ce0.2O2.4/Al2O3-TiO2-SiO2 catalyst, tungsten incorporation, cement flue gas deNOx, anti K2O poisoning, anti CaO poisoning

CLC Number:

TB34

FU Wei-Liang, SHEN Yue-Song, ZHU She-Min, SHEN Shu-Bao. Promotional Effect of Tungsten Incorporation on Catalytic Performance of Ti_0.8Zr_0.2Ce_0.2O_2.4/Al₂O₃-TiO₂-SiO₂ for Selective Catalytic Reduction of NO_x by NH₃[J]. Journal of Inorganic Materials, 2014, 29(12): 1294-1300.

Figures/Tables 9

References 29

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	Content/ wt%	TZC/ATS	TZCW_0.4/ATS
CaO	0.17	TZC/ATS-Ca_0.17	TZCW_0.4/ATS-Ca_0.17
	0.51	TZC/ATS-Ca_0.51	TZCW_0.4/ATS-Ca_0.51
	0.85	TZC/ATS-Ca_0.85	TZCW_0.4/ATS-Ca_0.85
	1.70	TZC/ATS-Ca_1.70	TZCW_0.4/ATS-Ca_1.70
K₂O	0.23	TZC/ATS-K_0.23	TZCW_0.4/ATS-K_0.23
	0.70	TZC/ATS- K_0.70	TZCW_0.4/ATS-K_0.70
	1.16	TZC/ATS- K_1.16	TZCW_0.4/ATS- K_1.16
	1.76	TZC/ATS-K_1.76	TZCW_0.4/ATS-K_1.76
	2.14	TZC/ATS- K_2.14	TZCW_0.4/ATS-K_2.14

	Content/ wt%	TZC/ATS	TZCW_0.4/ATS
CaO	0.17	TZC/ATS-Ca_0.17	TZCW_0.4/ATS-Ca_0.17
	0.51	TZC/ATS-Ca_0.51	TZCW_0.4/ATS-Ca_0.51
	0.85	TZC/ATS-Ca_0.85	TZCW_0.4/ATS-Ca_0.85
	1.70	TZC/ATS-Ca_1.70	TZCW_0.4/ATS-Ca_1.70
K₂O	0.23	TZC/ATS-K_0.23	TZCW_0.4/ATS-K_0.23
	0.70	TZC/ATS- K_0.70	TZCW_0.4/ATS-K_0.70
	1.16	TZC/ATS- K_1.16	TZCW_0.4/ATS- K_1.16
	1.76	TZC/ATS-K_1.76	TZCW_0.4/ATS-K_1.76
	2.14	TZC/ATS- K_2.14	TZCW_0.4/ATS-K_2.14

Sample	S_BET/(m²·g^-1)	V_pore/(cm³·g^-1)	d_pore/nm
TZC/ATS	84.29	0.185	8.771
TZCW_0.4/ATS	91.11	0.181	7.962
TZCW_0.4/ATS-K_1.76	89.16	0.185	8.297
TZCW_0.4/ATS-Ca_1.70	85.60	0.176	8.231

Sample	S_BET/(m²·g^-1)	V_pore/(cm³·g^-1)	d_pore/nm
TZC/ATS	84.29	0.185	8.771
TZCW_0.4/ATS	91.11	0.181	7.962
TZCW_0.4/ATS-K_1.76	89.16	0.185	8.297
TZCW_0.4/ATS-Ca_1.70	85.60	0.176	8.231

Promotional Effect of Tungsten Incorporation on Catalytic Performance of Ti_0.8Zr_0.2Ce_0.2O_2.4/Al₂O₃-TiO₂-SiO₂ for Selective Catalytic Reduction of NO_x by NH₃

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