| 性能优异的SrO改性Pd-Rh双金属催化剂的制备 |
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| 引用本文： | 兰丽,向军淮,黄隆,黄心,周伟奇,李红梅,朱艺,陈山虎.性能优异的SrO改性Pd-Rh双金属催化剂的制备[J].稀有金属材料与工程,2022,51(4):1231-1238. |
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| 作者姓名： | 兰丽 向军淮 黄隆 黄心 周伟奇 李红梅 朱艺 陈山虎 |
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| 作者单位： | 江西科技师范大学 材料与机电学院，江西 南昌 330013;成都大学 食品与生物工程学院，四川 成都 610064,江西科技师范大学 材料与机电学院，江西 南昌 330013,江西科技师范大学 材料与机电学院，江西 南昌 330013,成都大学 机械工程学院，四川 成都 610064,成都大学 机械工程学院，四川 成都 610064,成都大学 食品与生物工程学院，四川 成都 610064,玉溪师范学院 化学生物与环境学院，云南 玉溪 653100,江西科技师范大学 化学化工学院，江西 南昌 330013 |
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| 基金项目： | Key Research and Development Program of Sichuan Science and Technology Department (2019YFS0513); the National Natural Science Foundation of China (21962021) |
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| 摘 要： | 在浸渍到Al2O3载体材料上之前，通过将Sr的前驱体引入到贵金属Pd和Rh的混合盐溶液中，即采用共浸渍法制备了一系列SrO改性的Pd-Rh/Al2O3催化剂。结果表明，由于SrO的扩散障碍效应，适量SrO（1%~2%，质量分数）的引入有利于促进Pd，Rh的分散，并且能提高催化剂的水热稳定性。水热老化之后，催化剂能保持更高的Pd，Rh分散度，并且Pd，Rh能稳定在活性更好的氧化态。因此，适量SrO改性的Pd-Rh/Al2O3催化剂具有更好的还原性能和三效催化活性。然而，当向催化剂中引入过量的SrO，由于SrO占据了过量的Al2O3的表面，而且老化后会出现新的物相SrAl2O4，反而会对催化剂的性能产生不利的影响。总的来说，2% SrO改性的催化剂具有最优异的三效催化活性，水热老化之后，相比于空白的Pd-Rh/Al2O3催化剂，2%SrO改性的催化剂使CO，HC和NO的起燃温度分别降低了23，15和27 ℃。
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| 关 键 词： | SrO Pd-Rh/Al2O3催化剂 分散度 氧化态 三效催化活性 |
| 收稿时间： | 2021/2/19 0:00:00 |
| 修稿时间： | 2021/3/23 0:00:00 |
Synthesis of Sr-modified Pd-Rh Bimetallic Catalyst with Advanced Three-Way Catalytic Performance |
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| Lan Li,Xiang Junhuai,Huang Long,Huang Xin,Zhou Weiqi,Li Hongmei,Zhu Yi and Chen Shanhu.Synthesis of Sr-modified Pd-Rh Bimetallic Catalyst with Advanced Three-Way Catalytic Performance[J].Rare Metal Materials and Engineering,2022,51(4):1231-1238. |
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| Authors: | Lan Li Xiang Junhuai Huang Long Huang Xin Zhou Weiqi Li Hongmei Zhu Yi and Chen Shanhu |
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| Affiliation: | College of Materials and Mechatronics, Jiangxi Science and Technology Normal University, Nanchang 330013, China;College of Food and Bioengineering, Chengdu University, Chengdu 610064, China,College of Materials and Mechatronics, Jiangxi Science and Technology Normal University, Nanchang 330013, China,College of Materials and Mechatronics, Jiangxi Science and Technology Normal University, Nanchang 330013, China,College of Mechanical Engineering, Chengdu University, Chengdu 610064, China,College of Mechanical Engineering, Chengdu University, Chengdu 610064, China,College of Food and Bioengineering, Chengdu University, Chengdu 610064, China,College of Chemistry Biology and Environment, Yuxi Normal University, Yuxi 653100, China,College of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China |
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| Abstract: | A series of SrO-modified Pd-Rh/Al2O3 catalysts were synthesized by co-impregnation technique, i.e., Sr precursor was introduced into the mixed salt solution of Pd and Rh prior to their impregnation on Al2O3 powders. The results reveal that owing to the diffusion barrier effect of SrO, the introduction of appropriate amount of SrO (1wt%~2wt%) can increase the dispersion of Pd and Rh, as well as improve the hydrothermal stability of the catalyst. After hydrothermal aging treatment, higher dispersion and more active oxidation state of Pd and Rh are maintained. Consequently, modified reduction capability and improved three-way catalytic performance can be obtained for the appropriate SrO-modified Pd-Rh/Al2O3 catalyst. However, when excessive amount of SrO is introduced, plenty of surface sites on Al2O3 support will be occupied, and new SrAl2O4 phase is generated, leading to adverse effect instead. To sum up, the catalyst modified by 2wt% SrO exhibits the best three-way catalytic performance, by which after hydrothermal aging treatment, the light-off temperatures of CO, HC and NO are 23, 15 and 27 °C lower than those by bare Pd-Rh/Al2O3 catalyst. |
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| Keywords: | SrO Pd-Rh/Al2O3 catalysts dispersion oxidation state three-way catalytic performance |
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