甲烷在Cr改性Pd／AI203催化剂上的催化燃烧性能.pdf

学兔兔 化 工 进 展 ·3258· CHEMICAL 1NDUSTRY AND ENGINEERING PROGRESS 2014年第33卷第12期 甲烷在Cr改性Pd／AI203催化剂上的催化燃烧性能 苑兴洲，陈绍云，陈恒，张永春 (大连理工大学化工与环境生命学部，化工学院，精细化工国家重点实验室，辽宁 大连 116023) 摘要：研究了cr改性Pd／Al2O3催化剂上低浓度甲烷的催化燃烧反应，考察了载体 CrA1的制备方法和活性组分 Pd的负载方法对催化剂催化活性的影响以及添加ce对催化剂高温稳定性的影响。采用x射线衍射、程序升温 还原等表征手段分析了催化剂结构和氧化还原性。结果表明，与采用沉淀法制备的载体P—CrA1相比，采用浸渍 法制备的载体I-CrA1具有较高的比表面积和反应活性；用NaBH3对Pd负载过程进行还原处理能明显提高催化 剂活性，其原因是还原过程加强了催化剂上Pd与载体CrA1之间的作用，通过H2一TPR证明了其还原能力得到了 增加；添加ce缓解了A1 03高温条件下的烧结，增强了催化剂的高温稳定性。 关键词：Pd基催化剂；催化剂载体；氧化；催化 (作用)；Cr改性；稳定性 中图分类号：O 643 文献标志码：A 文章编号：1000—6613(2014)12—3258—06 DOI：10．3969／j．issn．1000—6613．2014．12．021 Cr modified Pd／AI203 catalyst for methane combustion YUANXingzhou，CHENShaoyun，CHENHeng，ZHANG Yongchun (State Key Laboratory ofFine Chemicals，School ofChemical Engineering，Faculty ofChemical，Environmental and Biological Science and Technology，Dalian University ofTechnology，Dalian 1 16023，Liaoning，China) Abstract：The effects of CrA1 carrier preparation process and Pd loading methods on the catalytic activity of Cr modified Pd／A1203 catalyst for low concentration methane combustion were investigated，and the influence of Ce addition on the high—temperature stability of catalyst was also tested．X-ray diffraction and temperature programmed reduction were used to characterize the structure and redox ability of catalysts．The I-CrA1 carrier prepared by impregnation had high specific surface area，and the pores were not blocked．Reduction treatment in the process of Pd loading significantly improved the activity of catalysts．Temperature—