摘要
以介孔ZrO2为载体,采用湿式浸渍法制备了担载型铜基催化剂,以甲烷催化燃烧为模型反应考察了不同铜含量对催化剂结构和性能的影响,并采用N2吸附-脱附、程序升温还原(TPR)和X射线衍射(XRD)等技术对催化剂进行了表征。结果显示CuO/ZrO2催化剂具有优良的甲烷催化燃烧性能;铜含量为5%质量分率的催化剂表现出最好的低温催化活性和优良的稳定性,甲烷转化率达到90%时对应的反应温度(T90)低至358℃;若铜含量继续增加,活性组分CuO会发生聚集,导致催化剂的低温活性降低。
Mesoporous ZrO2 support was obtained from thermal decomposition of zirconium nitrate, and the supported CuO based catalysts for methane catalytic combustion were prepared by wet impregnation method. The effects of copper loading on catalyst structure and catalytic performance were investigated by using N2 adsorption-desorption, temperature program reduction （TPR）, X-ray powder diffraction （XRD） techniques and methane combustion reaction. It was found that CuO-based catalysts supported on mesoporous zirconia showed excellent catalytic performances for methane catalytic combustion. The Cu5/ZrO2 catalyst with copper loading of 5% mass fraction gave the better low-temperature catalytic activity and stability, and the methane conversion reached 90% at a temperature as low as 358 ℃. With the further increase of copper loading more than 5%, the big-sized CuO crystals were formed and the average particle size of CuO crystals was gradually increased, there was negative effect on low-temperature catalytic activity.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2009年第3期223-227,共5页
Chemical Reaction Engineering and Technology
基金
教育部新世纪优秀人才计划资助(NCET-05-0783)
关键词
氧化铜
介孔二氧化锆
甲烷
催化燃烧
低温活性
copper oxide
mesoporous zirconia
methane catalytic combustion
lower-temperature activity
