Cobalt-containing Hydrotalcites Derived Catalysts for Simultaneous Removal of NOx and Soot

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (11): 2226.

• Articles • Previous Articles Next Articles

Cobalt-containing Hydrotalcites Derived Catalysts for Simultaneous Removal of NO_x and Soot

WANG Zhong-Peng^1,2*, ZHANG Zhi-Xiang², SHANGGUAN Wen-Feng²

1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;
2. Research Center for Combustion and Environmental Technology, Shanghai Jiaotong University, Shanghai 200240, China

Received:2009-01-08 Online:2009-11-10 Published:2009-11-10
Contact: WANG Zhong-Peng. E-mail: chm_wangzp@ujn.edu.cn
Supported by:
GM(通用汽车)-中国科学研究基金(批准号: 50222203)和济南大学博士基金(批准号: XBS0825)资助.

Abstract

Abstract:

Cobalt-containing mixed oxides(CAO) were prepared by thermal decomposition of hydrotalcite-like precursors with Co/Al molar ratio varying from 2 to 7. The catalytic activity of the CAO was investigated for the simultaneous catalytic removal of NO_x and diesel soot particulates by temperature-programmed reaction(TPR) technique in a fixed-bed flow reactor. The relationship between the catalyst structure and performance were clarified through ICP, BET, SEM and XPS measurements. The results show that all catalysts exhibit a nonstoichiometric spinel phase. Oxygen species present on the catalyst surface included lattice oxygen, the adsorbed oxygen and(or) the surface hydroxyl species, which acted for different mechanisms in soot oxidation. The catalytic activity was influenced by both Co/Al ratio and calcinations temperature. 4CAO-800 with the Co/Al molar ratio of 4 and calcinations temperature of 800 ℃ show the best activity with a low ignition tempe-rature(t_i=290 ℃) and high selectivity to N₂ formation(S_N2/C=3.5%). During the NO_x-soot reactions, a re-dox mechanism and a spillover mechanism may occur simultaneously for the catalytic soot oxidation.

Key words: Hydrotalcite; Mixed oxide; Soot particle; NO_x; Catalytic removal

TrendMD:

WANG Zhong-Peng*, ZHANG Zhi-Xiang, SHANGGUAN Wen-Feng. Cobalt-containing Hydrotalcites Derived Catalysts for Simultaneous Removal of NO_x and Soot[J]. Chem. J. Chinese Universities, 2009, 30(11): 2226.

References

[1]HE Hong(贺泓), WENG Duan(翁端), ZI Xin-Yun(资新运). Environmental Science(环境科学)[J], 2007, 28(6): 1169—1176
[2]ZHAO Zhen(赵震), ZHANG Gui-Zhen(张桂臻), LIU Jian(刘坚), et al.. Chinese J. Catal.(催化学报)[J], 2008, 29(3): 303—312
[3]Yoshida K., Makino S., Sumiya S., et al.. SAE Paper[OL], 1989. http: //www.sae.org/technical/paper/892046
[4]Milt V. G., Pissarello M. L., Miro E. E., et al.. Appl. Catal. B-Environ.[J], 2003, 41(4): 397—414
[5]Carrascull A., Lick I. D., Ponzi E. N., et al.. Catal. Commun.[J], 2003, 4(3): 124—128
[6]Xiao S., Ma K. W., Tang X. Y., et al.. Appl. Catal. B-Environ.[J], 2001, 32(1/2): 107—122
[7]Kureti S., Weisweiler W., Hizbullah K.. Appl. Catal. B-Environ.[J], 2003, 43(3): 281—291
[8]Matsuoka K., Orikasa H., Itoh Y., et al.. Appl. Catal. B-Environ.[J], 2000, 26(2): 89—99
[9]Shangguan W. F., Teraoka Y., Kagawa S.. Appl. Catal. B-Environ.[J], 1998, 16(2): 149—154
[10]Shangguan W. F., Teraoka Y., Kagawa S.. Appl. Catal. B-Environ.[J], 1996, 8(2): 217—227
[11]Liu J., Zhao Z., Xu C. M., et al.. Appl. Catal. B-Environ.[J], 2008, 78(1/2): 61—72
[12]Vaccari A.. Appl. Clay Sci.[J], 1999, 14(4): 161—198
[13]LIU Ya-Hui(刘亚辉), GUO Yu-Hua(郭玉华), WU Jing-Yi(吴静怡), et al.. Chem. J. Chinese Universities(高等学校化学学报)[J], 2008, 29(6): 1171—1175
[14]Yu J. J., Wang X. P., Li L. D., et al.. Adv. Funct. Mater.[J], 2007, 17: 3598—3606
[15]Cheng W. P., Yu X. Y., Wang W. J., et al.. Catal. Commun.[J], 2008, 9(6): 1505—1509
[16]Wang X. P., Yu J. J., Cheng J., et al.. Environ. Sci. Technol.[J], 2008, 42(2): 614—618
[17]Wang Z. P., Shangguan W., Su J. X., et al.. Catal. Lett.[J], 2006, 112(3/4): 149—154
[18]Wang Z. P., Jiang Z., Shangguan W.. Catal. Commun.[J], 2007, 8(11): 1659—1664
[19]WANG Zhong-Peng(王仲鹏), CHEN Ming-Xia(陈铭夏), SHANGGUAN Wen-Feng(上官文峰). Acta Phys. Chim.Sin.(物理化学学报)[J], 2009, 25(1): 79—85
[20]WANG Zhong-Peng(王仲鹏), ZHANG Zhi-Xiang(张志翔), ZHANG Hai-Rong(张海蓉), et al.. Journal of Molecular Catalysis(分子催化)[J], 2007, 21(Sullp.): 665—666
[21]Shangguan W., Teraoka Y., Kagawa S.. Appl. Catal. B-Environ.[J], 1996, 8(2): 217—227
[22]Harrison P. G., Ball I. K., Daniell W., et al.. Chem. Eng. J.[J], 2003, 95(1—3): 47—55
[23]Kannan S., Swamy C. S.. Catal. Today[J], 1999, 53(4): 725—737
[24]Trifiro F., Vaccari A., Clause O.. Catal. Today[J], 1994, 21(1): 185—195
[25]Zsoldos Z., Guczi L.. J. Phys. Chem.[J], 1992, 96(23): 9393—9400
[26]Fierro G., Lo Jacono M., Inversi M., et al.. Top. Catal.[J], 2000, 10(1/2): 39—48
[27]Khassin A. A., Yurieva T. M., Kaichev V. V., et al.. J. Mol. Catal. A-Chem.[J], 2001, 175(1/2): 189—204
[28]Shangguan W., Teraoka Y., Kagawa S.. Appl. Catal. B-Environ.[J], 1997, 12(2/3): 237—247
[29]ZHU Ling(朱玲). Catalytic Oxidation of Soot on Ce-based Solid Solutions Catalysts(Ce基固溶体催化剂上碳颗粒物的催化氧化)[D], Beijing: Graduate University of the Chinese Academy of Sciences, 2006

Cobalt-containing Hydrotalcites Derived Catalysts for Simultaneous Removal of NO_x and Soot

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 0

Recommended Articles

Metrics

Comments