Citation: LI Hong-Mei, LAN Li, CHEN Shan-Hu, LIU Da-Yu, WANG Wei, GONG Mao-Chu, CHEN Yao-Qiang. Preparation of CeO₂-ZrO₂-Al₂O₃ with a Composite Precipitant and Its Supported Pd-Only Three-Way Catalyst[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1734-1746. doi: 10.3866/PKU.WHXB201603235 shu

Preparation of CeO₂-ZrO₂-Al₂O₃ with a Composite Precipitant and Its Supported Pd-Only Three-Way Catalyst

LI Hong-Mei ^1,2,3, ,
LAN Li ^1,2 ,
CHEN Shan-Hu ⁴ ,
LIU Da-Yu ¹ ,
WANG Wei ¹ ,
GONG Mao-Chu ² ,
CHEN Yao-Qiang ²

1.
Faculty of Pharmacy and Bioengineering, Chengdu University, Chengdu 610106, P. R. China;
2.
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
3.
Key Laboratory of Green Chemistry, Sichuan University of Science and Engineering, Zigong 643000, Sichuan Province, P. R. China;
4.
inocat Environmental Protection Co., Ltd., Chengdu 611731, P. R. China

Received Date: 18 January 2016
Revised Date: 22 March 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21173153), National Hi-tech Research and Development Program of China (863) (2015AA034603), and Opening Project of Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education, China (LYJ1407).

Acomposite precipitant composed of ammonia and ammoniumcarbonate was used to prepare CeO₂-ZrO₂-Al₂O₃ (CZA). For comparison, two other CZA samples were prepared using ammonia and ammonium carbonate as the precipitants, respectively. Differences in the textural, structural and redox properties, together with the evolution upon thermal aging treatment and the catalytic performance of the corresponding Pd-only three-way catalysts, were investigated systematically. The choice of precipitant was found to affect the interactions between CeO₂-ZrO₂ (CZ) and Al₂O₃. When ammonia was used as the precipitant, the resulting CZ and Al₂O₃ seemed insusceptible to each other, thus the obtained CZA composite displayed inferior thermal stability due to the weakest interaction between CZ and Al₂O₃. In the case of ammonium carbonate, stronger interaction between CZ and Al₂O₃ enhanced the thermal stability of CZA, but in the meantime, the homogeneity of the CZ solid solution was severely impaired by Al₂O₃, leading to undesirable redox performance. Fortunately, the use of the composite precipitant brought about favorable interaction between CZ and Al₂O₃, leading to excellent textural and structural properties along with the highest thermal stability of the CZA compound. Consequently, the corresponding Pd-based catalyst displayed prominent reducibility and oxygen storage capacity (OSC) performance, as well as superior three-way catalytic performance.
- CeO₂-ZrO₂-Al₂O₃ compound,
- Composite precipitant,
- Pd-only three-way catalyst,
- Interaction,
- Thermal stability
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Preparation of CeO₂-ZrO₂-Al₂O₃ with a Composite Precipitant and Its Supported Pd-Only Three-Way Catalyst