Al_2O_3填充对Pt/CeO_2催化剂热稳定性的影响  

The Influence of Al_2O_3 on the Thermal Stability of Pt/Ceo_2 Catalyst

作　　者：李经纬 赵建国[1] 潘启亮[1] 邢宝岩[1] 陈栋栋 李宁 乔俊[1] 蒋尚 庞明俊 LI Jing-wei1, ZHAO Jian-guo1＊, PAN Qi-liang1, XING Bao-yan1, CHEN Dong-dong2, LI Ning1QIAO Jun1, JIANG Shang1, PANG Ming-jun1(1. Institute of Carbon Materials Science, Shanxi Datong University, Datong Shanxi, 037009;2. Lv Liang University, Lv Liang Shanxi, 03300)

机构地区：[1]山西大同大学炭材料研究所,山西大同037009 [2]吕梁学院,山西吕梁033000

出　　处：《山西大同大学学报（自然科学版）》2018年第3期1-4,共4页Journal of Shanxi Datong University(Natural Science Edition)

基　　金：山西省石墨烯产业化应用技术协同创新中心;山西省石墨烯功能材料工程技术研究中心项目[201705D141034];山西省人才专项(优秀人才科技创新)[201705D211010];山西省重点研发计划(工业项目)[201703D121037-2];大同市应用基础研究[2017123]

摘　　要：Pt/CeO_2是一类重要的贵金属-稀土氧化物催化剂,在许多化工生产过程中有着广泛应用,但其热稳定性较差、使用寿命短的问题始终没有得到有效解决。本文利用仲丁醇铝水解在Pt/CeO_2催化剂中填充纳米Al_2O_3作为抗扩散层,比较了填充与未填充Al_2O_3抗扩散层的Pt/CeO_2催化剂经500~800℃高温老化后的烧结程度,并以CO氧化作为探针反应来考查Al_2O_3抗扩散层的填充对Pt/CeO_2催化剂抗烧结性能的影响。结果表明,Pt/CeO_2催化剂在800℃老化5 h后对CO的完全转化温度由120℃提高到380℃;而Pt/CeO_2@Al_2O_3催化剂经相同条件老化后对CO的完全转化温度仅由190℃提升至220℃。Pt / CeO2 is an important precious metal-rare earth oxide composite catalyst, which was utilized in various industrialprocesses. However, the problem of its poor thermal stability and short service life has not been effectively solved. In this paper, Al2O3was employed as anti-diffusion layer by the hydrolysis of aluminum tri-sec-butoxide, and the sintering degree of the catalysts beforeand after the addition of Al2O3 was also compared. The oxidation of CO was used as a probe to examine the effect of Al2O3 on the sinterresistance of Pt/CeO2 catalysts. The results showed that after aging at 800 ℃ for 5 h, for Pt/CeO2 catalyst, the temperature for CO com？plete oxidation increased from 120℃ to 380℃, while the activity of Pt/CeO2-rod@Al2O3 catalyst barely changed after aging and the tem？perature for CO complete oxidation increased from 190 ℃ to 220 ℃.

关 键 词：Pt/CeO2催化剂 AL2O3 热稳定性 

分 类 号：O643.36[理学—物理化学]