浸渍/共沉淀法对BaO改性单Pd催化剂净化甲醇汽油车尾气性能的影响

引用本文: 张雪乔, 田浩杞, 叶芝祥, 陈耀强. 浸渍/共沉淀法对BaO改性单Pd催化剂净化甲醇汽油车尾气性能的影响[J]. 无机化学学报, 2015, (1): 166-176. doi: 10.11862/CJIC.2015.002 shu

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

浸渍/共沉淀法对BaO改性单Pd催化剂净化甲醇汽油车尾气性能的影响

张雪乔 ^1,2, ,
田浩杞 ^1, ,
叶芝祥 ^1, ,
陈耀强 ^{2,
,}

1.
1 成都信息工程学院资源环境学院, 成都 610225;
2.
2 四川大学催化材料科学研究所, 成都 610064

通讯作者: 陈耀强nic7501@scu.edu.cn

基金项目:
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)

摘要: 采用浸渍和共沉淀两种方法分别制备了BaO改性的Pd/CeO₂-ZrO₂-La₂O₃-Al₂O₃催化剂.运用N₂吸附-脱附,X射线衍射(XRD),H₂程序升温还原(H₂-TPR),NH₃程序升温脱附(NH₃-TPD),透射电子显微镜(TEM)和X射线光电子能谱(XPS)对催化剂进行表征,并考察其对甲醇,CO,C₃H₈和NO的催化性能.活性测试结果表明,BaO的引入可明显改善Pd催化剂对甲醇,CO,C₃H₈和NO的催化活性,且浸渍法最佳,起燃温度(T₅₀)分别降低了43,31,45和35℃.XRD,H₂-TPR及XPS结果表明,浸渍法引入BaO主要通过表面改性方式,强化Pd-Ce界面间的相互作用,改善催化剂的还原性能,进而提高催化剂的低温活性;而共沉淀法则是通过结构改性方式增加CeO₂晶格缺陷,加速活性氧物种的流动,Ce³⁺浓度的增加是促使CO氧化活性显著提高的主要原因.

关键词:

氧化钡;钯;铈;甲醇;催化转化

English

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;
2.
2. Institute of Catalytic Material Science, Sichuan University, Chengdu 610064, China

Corresponding author: 陈耀强nic7501@scu.edu.cn

Received Date: 24 April 2014
Fund Project:
国家自然科学基金(No.51408076,11405113)

四川省教育厅重点科研基金(No.14ZA0163)

成都信息工程学院科研人才基金(No.J201416)资助项目.

Abstract: 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.

Key words:

barium oxide;palladium;ceria;methanol;catalytic activity removal

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

浸渍/共沉淀法对BaO改性单Pd催化剂净化甲醇汽油车尾气性能的影响

通讯作者: 陈耀强nic7501@scu.edu.cn

English

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

Corresponding author: 陈耀强nic7501@scu.edu.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

浸渍/共沉淀法对BaO改性单Pd催化剂净化甲醇汽油车尾气性能的影响

通讯作者: 陈耀强nic7501@scu.edu.cn

English

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

Corresponding author: 陈耀强nic7501@scu.edu.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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