Citation: HUANG Li-Hua, CHEN Yao-Qiang. Effect of Calcination Temperature on Three-Way Catalytic Performance of Pd/Ce_0.65Zr_0.35O₂ Prepared by Soft-Hard Template Method[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(11): 2145-2156. doi: 10.11862/CJIC.2020.227 shu

Effect of Calcination Temperature on Three-Way Catalytic Performance of Pd/Ce_0.65Zr_0.35O₂ Prepared by Soft-Hard Template Method

HUANG Li-Hua ¹ ,
CHEN Yao-Qiang ^2,,

1.
Institute of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
2.
College of Chemistry, Sichuan University, Chengdu 610064, China

Corresponding author: CHEN Yao-Qiang, nic7501@scu.edu.cn
Received Date: 23 March 2020
Revised Date: 22 June 2020

Figures(8)

High thermal stability Ce_0.65Zr_0.35O₂(CeZr) was prepared by soft-hard template method. The influence of calcination temperature on properties of Ce_0.65Zr_0.35O₂ and its corresponding Pd based three-way catalyst (TWC) was investigated. The samples were analyzed by X-ray diffraction, surface area analysis, Raman spectrum, X-ray photoelectron spectroscopy, oxygen storage capacity and H₂-temperature-programmed reduction. The results indicate that the structure and redox properties are strongly influenced by calcination temperature. The structure properties, for instance, BET (Brunaner-Emmett-Teller) surface area declined along with the rise of temperature, but the BET surface area of the sample calcinated at 1 000℃ was 61 m²·g^-1, which was significantly higher than that calcinated direct in air at the same temperature. The OSC and reduction property of Ce_0.65Zr_0.35O₂ increased with the rise of calcination temperature because of phase rearrangement at high temperature. The redox property of their corresponding catalysts decreased due to descending of Pd dispersion, which results in decline of three-way catalytic activity at last. Although high temperature sintering led to decrease of catalytic performance, the catalyst prepared by soft-hard template method calcinated at 1 000℃ still had excellent activity. The light-off temperature for C₃H₈, CO and NO was 274, 175 and 133℃, respectively, which was significantly lower than catalyst calcined direct in air at the same temperature. Redox property and dispersity of Pd are significant factors affecting activity of catalyst.
- Ce_0.65Zr_0.35O₂,
- high thermal stability,
- catalytic performance
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Calcination Temperature on Three-Way Catalytic Performance of Pd/Ce0.65Zr0.35O2 Prepared by Soft-Hard Template Method

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通讯作者: 陈斌, bchen63@163.com

Effect of Calcination Temperature on Three-Way Catalytic Performance of Pd/Ce_0.65Zr_0.35O₂ Prepared by Soft-Hard Template Method