含硫气氛中Ce改性Cu-Mn/Al2O3低温催化氧化CO性能研究
Low-temperature catalytic CO oxidation performance of Ce-modified Cu-Mn/Al2O3 in sulfur-containing atmospheres
王正芳 1高君安 1张傑 1曲令多2
作者信息
- 1. 北京化工大学 化学工程学院,北京 100029
- 2. 淄博齐创新材料科技有限公司,淄博 255100
- 折叠
摘要
为了解决Cu-Mn催化剂在含硫气氛中催化氧化CO时快速失活的问题,以Cu-Mn为活性组分、Ce改性的γ-Al2O3 为载体制备了Ce改性Cu-Mn/Al2O3 催化剂,并采用扫描电子显微镜(SEM)、X射线衍射(XRD)、N2吸附-脱附测试(BET)、氢气程序升温还原(H2-TPR)、X射线光电子能谱(XPS)对其进行了表征,结果表明:CeO2 的加入提高了活性组分的分散度,降低了Cu-Mn/Al2O3 催化剂的还原温度,增加了Cu2+、Mn3+及氧空位的含量.测试了Ce改性Cu-Mn/Al2O3 催化剂的CO催化氧化活性及抗硫中毒性能,发现Ce的加入可以提高催化剂的CO催化氧化性能,采用浸渍法改性(Ce)/Al2O3 载体(Ce负载量为 2％)制备的催化剂(10Cu1 Mn2/2(Ce)/Al2O3)的催化性能较高,可以在130℃下实现CO完全氧化;添加Ce后催化剂的抗硫中毒性能有一定提升,在160℃下通入SO2 后5h,催化剂10Cu1 Mn2/2(Ce)/Al2O3 能够维持57％左右的CO转化率,在300℃下测试25h该催化剂的活性没有下降.
Abstract
In order to solve the problem of rapid deactivation of Cu-Mn catalysts in the catalytic oxidation of CO in sulfur-containing atmospheres,a Ce-modified Cu-Mn/Al2O3 catalyst was prepared by using Cu-Mn as the active component,and Ce-modified γ-Al2O3 as the support.The catalyst was characterized by scanning electron micros-copy(SEM),X-ray diffraction(XRD),N2 adsorption-desorption measurements(BET),hydrogen temperature programmed reduction(H2-TPR)and X-ray photoelectron spectroscopy(XPS).The results show that the addition of CeO2 can improve the dispersion of active components,reduce the reduction temperature of the Cu-Mn/Al2O3 catalyst,and increase the content of Cu2+,Mn3+and oxygen vacancies.The CO catalytic oxidation activity and sulfur poisoning resistance of the Ce-modified Cu-Mn/Al2O3 catalyst were tested.It was found that the addition of Ce improved the CO catalytic oxidation performance of the catalyst.The catalyst 10Cu1 Mn2/2(Ce)/Al2O3 prepared using a(Ce)/Al2O3 support(with a Ce loading of 2％)modified using an impregnation method had higher catalyt-ic performance and could achieve complete oxidation of CO at 130℃.The sulfur poisoning resistance of the catalyst was enhanced after the addition of Ce.After the introduction of SO2 at 160℃for 5 h,the catalyst 10Cu1 Mn2/2(Ce)/Al2O3 maintained a CO conversion of about57％.Furthermore,the activity of the catalyst did not decrease even after 25 h at 300℃.
关键词
CeO2/Cu-Mn/Al2O3/CO催化氧化/抗硫中毒Key words
CeO2/Cu-Mn/Al2O3/CO catalytic oxidation/sulfur poisoning resistance引用本文复制引用
基金项目
国家重点研发计划(2021YFF0307401)
出版年
2024
NETL
NSTL
万方数据