催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (6): 1040-1045.DOI: 10.3724/SP.J.1088.2011.10145

• 研究论文 • 上一篇    下一篇

尿素水解法制备降解地表臭氧的 Pd-MnOx/Al2O3 催化剂

潘浩, 周丽娜, 朱艺, 彭娜, 龚茂初, 陈耀强*   

  1. 四川大学绿色化学与技术教育部重点实验室, 四川成都 610064
  • 收稿日期:2011-01-24 修回日期:2011-03-03 出版日期:2011-06-21 发布日期:2014-10-31

Ground-Level Ozone Decomposition over Pd-MnOx/Al2O3 Catalyst Prepared by Urea Hydrolysis

PAN Hao, ZHOU Lina, ZHU Yi, PENG Na, GONG Maochu, CHEN Yaoqiang*   

  1. Key Laboratory of Green Chemistry and Technology of Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2011-01-24 Revised:2011-03-03 Online:2011-06-21 Published:2014-10-31

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摘要： 采用尿素水解法制备了 Pd-MnOx/Al2O3催化剂, 运用低温 N2 吸附-附和 X 射线衍射对其进行了表征, 并评价了其催化降解地表 O3 反应活性, 考察了 Pd, MnOx 焙烧时间和 MnOx 含量对催化剂活性的影响. 结果表明, 在高空速 (660000 h-1)、高相对湿度 (85%~90%) 条件下, MnOx 焙烧时间为 6 h 且 MnOx 含量为 80% 的 Pd-MnOx/Al2O3催化剂于低温 (20~25 ºC) 就表现出较高的催化活性, 20 ºC 时 O3 转化率就高达 91.7%, 其完全转化温度为 24 oC. 可以预知该催化剂涂覆在汽车水箱散热片上, 于室温就可完全降解地表 O3, 尤其适用于汽车冷启动和冬季时净化 O3.

关键词: 钯, 锰氧化物, 尿素水解法, 相对湿度, 地表臭氧, 催化降解, 完全降解

Abstract: The Pd-MnOx/Al2O3 catalyst has been prepared by the urea hydrolysis method and characterized by low temperature nitrogen adsorption-desorption and X-ray diffraction. Its catalytic activity for decomposing ground-level ozone has been studied. The catalyst showed a high activity at low temperature and high relative humidity. At gas hourly space velocity (GHSV) of 660000 h-1 and relative humidity of 85%–90%, the ozone conversion over the catalyst reached 91.7% at 20 °C and the temperature for complete decomposition of ozone was only 24 °C. Furthermore, the prepared catalyst can completely decompose ground-level ozone when it is coated on the wave shaped heat patches of automobile water tanks.

Key words: palladium, manganese oxide, urea hydrolysis method, relative humidity, ground-level ozone, catalytic decomposition, completely decompose