Citation: ZHANG Xue-Qiao, TIAN Hao-Qi, YE Zhi-Xiang, CHEN Yao-Qiang. BaO Modified Pd-Based Catalysts: Synthesis by Impregnation/Co-Precipitation and Application in Gasoline-Methanol Exhaust Purification[J]. Chinese Journal of Inorganic Chemistry, ;2015, (1): 166-176. doi: 10.11862/CJIC.2015.002 shu

BaO Modified Pd-Based Catalysts: Synthesis by Impregnation/Co-Precipitation and Application in Gasoline-Methanol Exhaust Purification

1.
1. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
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2. Institute of Catalytic Material Science, Sichuan University, Chengdu 610064, China

Corresponding author: CHEN Yao-Qiang,
Received Date: 24 April 2014
Available Online: 8 September 2014
Fund Project: 国家自然科学基金(No.51408076,11405113) (No.51408076,11405113)四川省教育厅重点科研基金(No.14ZA0163) (No.14ZA0163)成都信息工程学院科研人才基金(No.J201416)资助项目. (No.J201416)

Barium oxide was developed to modify palladium catalysts supported on CeO₂-ZrO₂-La₂O₃-Al₂O₃ (CZLA) compound oxides by impregnation/co-precipitation methods. Low temperature N₂ adsorption-desorption, X-ray diffraction (XRD), H₂-temperature-programmed reduction (H₂-TPR), NH₃-temperature programmed desorption (NH₃-TPD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the influence of the preparation method on physicochemical properties of the catalyst. Catalytic activity performance for methanol, CO, C₃H₈ and NO conversion was evaluated. Catalytic activity results show that the addition of BaO has a positive effect on the conversion of all pollutants, and the best results are achieved by the impregnation method. The light-off temperature decreases by 43, 31, 45 and 35 ℃, respectively. The XRD, H₂-TPR and XPS results confirm that the impregnation method is mainly based on the surface modification. The enrichment of Ba²⁺ strengthens the Pd-Ce interaction in Pd-Ce interface, promoting the reductive ability, thus increasing the catalytic activity at low temperature. The co-precipitation method results in structure disorder and additional anion vacancies accompanied by the formation of more Ce³⁺, which may be beneficial to the conversion of CO.
- barium oxide;palladium;ceria;methanol;catalytic activity removal
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