催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (3): 513-519.DOI: 10.3724/SP.J.1088.2011.01124

• 研究论文 • 上一篇    

Pt/Ce0.8La0.2O1.9 催化剂上巴豆醛选择性加氢

陈萍, 谢冠群, 郑海影, 朱琳, 罗孟飞   

  1. 浙江师范大学物理化学研究所, 浙江省固体表面反应化学重点实验室, 浙江金华 321004
  • 收稿日期:2010-11-23 修回日期:2011-01-06 出版日期:2011-03-04 发布日期:2014-08-01

Selective Hydrogenation of Crotonaldehyde over Pt/Ce0.8La0.2O1.9 Catalysts

CHEN Ping, XIE Guanqun, ZHENG Haiying, ZHU Lin, LUO Mengfei*   

  1. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
  • Received:2010-11-23 Revised:2011-01-06 Online:2011-03-04 Published:2014-08-01

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摘要： 采用浸渍法制备了 Ce0.8La0.2O1.9 固溶体负载 Pt 催化剂, 用于气相巴豆醛选择加氢反应中. 采用 X 射线粉末衍射、程序升温还原、NH3 程序升温脱附和拉曼光谱等技术对催化剂进行了表征. 结果表明, 随着 Pt 负载量增加, Pt/Ce0.8La0.2O1.9 催化剂活性 (TOF) 和巴豆醇选择性均先增加后降低. 当 Pt 负载量为 3% 时, 反应 TOF 值和巴豆醇选择性最高, 分别为 4.01 × 10-3 s-1和 53.6%. 催化剂性能取决于催化剂表面酸性和 Pt 晶粒大小, 反应过程中催化剂表面积炭是导致催化剂活性和选择性下降的主要原因.

关键词: 铂, 负载型催化剂, 巴豆醛, 选择性加氢, 巴豆醇, 积炭

Abstract: The vapor-phase selective hydrogenation of crotonaldehyde was carried out over Pt/Ce0.8La0.2O1.9 catalysts prepared by impregnation. The catalysts were characterized by X-ray powder diffraction, temperature-programmed reduction, NH3 temperature- programmed desorption, and Raman spectroscopy. It was found that with increasing Pt loading in Pt/Ce0.8La0.2O1.9, both the activity (TOF) and selectivity for crotyl alcohol increased first and then decreased a little. The 3%Pt/Ce0.8La0.2O1.9 catalyst showed the highest activity (TOF) and selectivity for crotyl alcohol in hydrogenation of crotonaldehyde (4.01 × 10-3 s-1 and 53.6%, respectively). It was concluded that the catalytic performance of the catalysts depends on the surface acidity and the Pt particle size. Carbon deposition formed on the catalyst surface during the hydrogenaton process may account for the decrease in the catalytic activity and selectivity for crotyl alcohol.

Key words: platinum, supported catalyst, crotonaldehyde, selective hydrogenation, crotyl alcohol, carbon deposition