Citation: CUI Ya-Juan, FANG Rui-Mei, SHANG Hong-Yan, SHI Zhong-Hua, GONG Mao-Chu, CHEN Yao-Qiang. Effect of Support Materials on Property and Catalytic Performance of Pd-Only Three-Way Catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2015, (5): 989-1002. doi: 10.11862/CJIC.2015.120 shu

Effect of Support Materials on Property and Catalytic Performance of Pd-Only Three-Way Catalyst

CUI Ya-Juan ¹ ,
FANG Rui-Mei ² ,
SHANG Hong-Yan ² ,
SHI Zhong-Hua ^3,4,5 ,
GONG Mao-Chu ^3,4,5 ,
CHEN Yao-Qiang ^1,2,3,4,5,,

1.
1 College of Architecture and Environment, Sichuan University, Sichuan, Chengdu 610065, China;
2.
2 College of Chemical Engineering, Sichuan University, Sichuan, Chengdu 610065, China;
3.
3 Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Sichuan, Chengdu 610064, China;
4.
4 Center of Engineering of Vehicular Exhaust Gases Abatement, Sichuan Province, Sichuan, Chengdu 610064, China;
5.
5 Center of Engineering of Environmental Catalytic Material, Sichuan Province, Sichuan, Chengdu 610064, China

Corresponding author: CHEN Yao-Qiang,
Received Date: 8 November 2014
Available Online: 13 February 2015
Fund Project: 国家自然科学基金(No.21173153) (No.21173153)四川省科技厅科技支撑项目(2011GZ0035)资助。 (2011GZ0035)

Four kinds of support materials, i.e. a thermally stable material La₂O₃-Al₂O₃(LA), three oxygen storage materials CeO₂-ZrO₂-La₂O₃-Al₂O₃(CZLA), CeO₂-ZrO₂-La₂O₃+La₂O₃-Al₂O₃(CZL+LA) and CeO₂-ZrO₂-La₂O₃(CZL) with ceria content of 15%, 33% and 47%, respectively, were prepared by co-precipitation. The corresponding Pd-only catalysts Pd/LA, Pd/CZLA, Pd/CZL+LA and Pd/CZL were obtained by wet-impregnation and further fabricated as three-way catalysts in a monolith form. The support materials were characterized by low temperature nitrogen adsorption-desorption and H₂-temperature programmed reduction (H₂-TPR). The catalysts were characterized by H₂-TPR and XPS, and were evaluated with a simulated automobile exhaust in terms of the relationships of three way performance with the air/fuel operation window and with temperatures. The results indicate that the support material CZLA integrates the advantages of ceria-based and alumina-based materials effectively thus having superior textural property, thermal stability and reduction property. Additionally, Pd/CZLA catalyst shows little difference in low temperature reducibility, surface elemental distribution and elemental oxidation states before and after aging treatment. As a result, Pd/CZLA exhibits the widest air/fuel operation window and the lowest light-off temperature among the four catalysts, especially after aging treatment, the light-off temperature of C₃H₈, NO_x and CO is 370 ℃, 257 ℃, 223 ℃, respectively. Then material CZLA is the most suitable support for Pd-only three-way catalyst compared with the other three supports.
- palladium;catalysts;Heterogeneous catalysis;support materials;textural properties;thermal stability;Pd-only three-way catalysts;catalytic performance
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