Ce0.1+xTi0.5-xAl0.2Y0.1La0.1O1.8材料的制备及在三效催化剂中的应用

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (8): 1625.

Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8材料的制备及在三效催化剂中的应用

王康才, 刘志敏, 王健礼, 蔡黎, 陈耀强, 龚茂初

四川大学化学学院, 绿色化学与技术教育部重点实验室, 成都 610064

收稿日期:2008-10-21 出版日期:2009-08-10 发布日期:2009-08-10
通讯作者: 龚茂初, 男, 博士, 教授, 主要从事催化化学和催化材料研究. E-mail: nic7501@scu.edu.cn
基金资助:
国家“八六三”计划(批准号: 2006AA062347)和国家自然科学基金(批准号: 20773090)资助.

Preparation of Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8 and Its Application in Three-way Catalyst

WANG Kang-Cai, LIU Zhi-Min, WANG Jian-Li, CAI Li, CHEN Yao-Qiang, GONG Mao-Chu*

Key Laboratory of Green Chemistry & Technology Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China

Received:2008-10-21 Online:2009-08-10 Published:2009-08-10
Contact: GONG Mao-Chu. E-mail: nic7501@scu.edu.cn
Supported by:
国家“八六三”计划(批准号: 2006AA062347)和国家自然科学基金(批准号: 20773090)资助.

摘要/Abstract

摘要：

采用共沉淀法制备了Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8(0≤x≤0.4)材料, 并对所制备的材料进行了X射线衍射(XRD)和X射线光电子能谱(XPS)的表征, 测定了材料的比表面积(BET法)和储氧量(OSC), 同时采用氢气程序升温还原(H₂-TPR)和氨气程序升温脱附(NH₃-TPD)研究了材料的还原性能和表面酸性. 研究结果表明, Ce/Ti摩尔比大于1∶2的材料能形成立方萤石结构的固溶体, Ce/Ti摩尔比为1时, 材料表面Ce⁴⁺/Ce³⁺摩尔比达到最大; 随着Ce/Ti摩尔比的增大, 材料的储氧能力先增大后减小, 而TPR还原峰温则是先减小后增大, 当Ce/Ti摩尔比为1时, 材料的储氧量达到最大, 为660 μmol/g; 还原峰峰温最低, 为616 ℃. 以制备的材料为载体制备了一系列Pt/Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8三效催化剂, 并对催化剂进行了活性评价. 活性测试结果表明, 以Ce/Ti比为1的载体材料制成的催化剂对C3H8, CO和NO的起燃温度分别为236, 147和228 ℃, 表现出了优异的温度特性.

关键词: Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8; Ce/Ti摩尔比; 载体材料; 三效催化剂

Abstract:

Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8(0≤x≤0.4) mixed oxides were prepared by co-precipitation method and characterized by means of X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), nitrogen adsorption(BET), oxygen storage capacity(OSC), H₂-temperature programmed reduction(H₂-TPR) and NH₃-temperature programmed desorption(NH₃-TPD). The results of XRD revealed that there was only one single cubic phase in Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8 system when x value increased from 0.2 to 0.4. The results of XPS showed that the ratio of superficial Ce⁴⁺/Ce³⁺ is maximal when x is 0.2. With the increase of Ce/Ti ratio, OSC is increased to a maximum value, and then gradually decreased. When x value is 0.2, the OSC reaches to 660 μmol/g, and the reduction temperature of Ce⁴⁺ is the lowest according to the H₂-TPR test(616 ℃). In this paper, a series of Pt/Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8 three-way catalysts were prepared and the catalytic activities of catalysts were investigated. The results revealed that Pt/Ce_0.3Ti_0.3Al_0.2Y_0.1La_0.1O_1.8 exhibits excellent low-temperature catalytic activity. The light-off temperature of C₃H₈, CO and NO over Pt/Ce_0.3Ti_0.3Al_0.2Y_0.1La_0.1O_1.8 is 236, 147 and 228 ℃, respectively.

Key words: Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8; Molar ratio of Ce/Ti; Support material; Three-way catalyst

TrendMD:

王康才, 刘志敏, 王健礼, 蔡黎, 陈耀强, 龚茂初. Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8材料的制备及在三效催化剂中的应用. 高等学校化学学报, 2009, 30(8): 1625.

WANG Kang-Cai, LIU Zhi-Min, WANG Jian-Li, CAI Li, CHEN Yao-Qiang, GONG Mao-Chu*. Preparation of Ce_0.1+xTi_0.5-xAl_0.2Y_0.1La_0.1O_1.8 and Its Application in Three-way Catalyst. Chem. J. Chinese Universities, 2009, 30(8): 1625.

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