物理化学学报 >> 2006, Vol. 22 >> Issue (05): 584-589.doi: 10.3866/PKU.WHXB20060514

研究论文 上一篇    下一篇

钛铝载体的合成及负载CuO对NO催化性能研究

李惠娟;蒋晓原;郑小明   

  1. 浙江大学理学院化学系催化研究所, 杭州 310028
  • 收稿日期:2005-11-01 修回日期:2005-12-28 发布日期:2006-04-28
  • 通讯作者: 蒋晓原 E-mail:xyjiang@mail.hz.zj.cn

Synthesis of TiO2/[[gamma]]r-Al2O3 and Effect of CuO Loading on NO Reduction

LI Hui-Juan;JIANG Xiao-Yuan;ZHENG Xiao-Ming   

  1. Institute of Catalysis, Faculty of Science, Zhejiang University, Hangzhou 310028, P. R. China
  • Received:2005-11-01 Revised:2005-12-28 Published:2006-04-28
  • Contact: JIANG, Xiao-Yuan E-mail:xyjiang@mail.hz.zj.cn

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摘要： 以TiCl4为原料合成了TiO2/[[alpha]]-Al2O3载体. 在色谱-微反流动法反应装置上考察了CuO/15%(w, 下同)TiO2/[alpha]-Al2O3系列催化剂对NO+CO 的反应性能. 结果表明上述催化剂对NO+CO 反应表现出较好的活性, 其中12%CuO/15%TiO2/[alpha]-Al2O3反应活性最佳. 空气和H2 预处理后, NO 完全转化的温度分别为300C[[deg]]和275C[deg].通过H2-TPR、XRD 和FT-IR 等技术表征, 发现适量TiO2能促进CuO 在钛铝载体上的分散. TPR 结果显示12%CuO/15%TiO2/[alpha]-Al2O3在整个TPR 过程中出现四个还原峰, 琢和酌还原峰分别是钛铝载体表面裸露的TiO2上高度分散的CuO 和晶相CuO 的还原；茁和啄还原峰为钛铝载体上高度分散的CuO 和晶相CuO 的还原. FT-IR实验表明NO和CO 在经H2气氛预处理的催化剂表面上吸附较强, 且生成了N2O 和NO2等物种；NO+CO混合气在经空气和H2预处理的催化剂表面吸附时, 出现了N2O吸收峰, 峰温分别为200C[deg]和150C[deg].

关键词: 12%CuO/15%TiO2/[alpha]-Al2O3, NO+CO反应, CO、NO 和NO+CO 吸附, FT-IR 表征

Abstract: TiO2/[alpha]-Al2O3 was prepared with TiCl4 as starting material, and the catalytic activities of CuO/TiO2/[alpha]-Al2O3 were examined using a GC micro-reactor NO+CO reaction system. The catalysts, especially 12%CuO/TiO2/[alpha]-Al2O3,showed high activities in NO+CO reaction. The NO conversion temperatures(T100%) were 300C[deg]and 275C[deg]for the catalysts pretreated by air and H2, respectively. The structural and reduction properties of CuO/TiO2/[alpha]-Al2O3 catalysts were analyzed using the H2-TPR, XRD, and FT-IR methods. It was found that proper amount of TiO2 increased the CuO dispersion on TiO2/[deg]-Al2O3. The 12%CuO/TiO2/[alpha]-Al2O3 catalyst had four reduction peaks ([alpha], [beta],[gamma] , and [delta]). The [alpha] and [deg]peaks were attributed to the reductions of highly dispersed CuO and crystalline CuO on the exposed TiO2 of TiO2 / [alpha]-Al2O3, respectively. On the other hand, the [beta] and [gamma]peaks were attributed to the reductions of highly dispersed CuOand crystalline CuOon TiO2/[alpha]-Al2O3, respectively. H2-pretreated 12%CuO/15%TiO2/[alpha]-Al2O3 had a strong adsorption of NO and CO, N2O and NO2 were formed. When NO and CO were adsorbed by 12%CuO/15%TiO2/[alpha]-Al2O3 the peak temperatures of N2O absorption were 200[deg]and 150C[deg] for the catalysts pretreated by air and H2, respectively.

Key words: 12%CuO/15%TiO2/[alpha]-Al2O3, NO+CO reaction, CO、NO and NO+CO adsorption, FT-IR