《PdNaZSM-5负载型催化剂上CO完全氧化研究》.pdf.pdf

.】629 化学学报 ACTA CHIMICA S州ICA Vd No —1629 Pd/*06^ (中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室兰州730000) 摘要采用浸渍法制备了一系列Pd/NaZSM-、反应温度、Pd含量及预还原等对c0 :制备条件和反应条件对催化活性均有较大影响,催化剂的活性随着焙烧温度的增加而降低,,TEM结果表明催化剂中Pd组分处于高分散状态;表面XPS分析证实催化剂表面Pd物种Pd02和PdO在反应过程中发生明显的表面化学变化,高价Pd物种随反应的进行逐步被c0 还原为低价Pd物种,. 关键词Pd/NaZSM-5催化剂,CO完全氧化,活性 Studies plete Oxidation over Pd/NaZSM-5 Supported Catalysts BI,Yu—Shin LIU,Jian-Fu -Xuan。(StateJ研Laboratoryfor Oxo Synthesis andSelective凸彘‘锄n,厶阿如u ofChemical ChineseAcademy矿& 730000) Abslract A series ofNaZSM一5 supported palladium catalysis havebeen严删by impregnation method. Influences ofthe caleinationtemperature,reaction teml)erature,Pd content andreduction on CO oxidationhave been foundthatthecatalyticaetivity decreased withtheinci'ease ofthecalcination temperature. thehi曲er reactiontemperature or Pd content resultedinthehighercatalyticpeIfjHn∞ce forCO oxidation,and H2 reduction on catalystresulted resultsofXRD and TEM show thatPd species ale highlydispersed over NaZSM一5 zeolite,which dependent on thepretreatment temperatures and reaction ofthesurfaceby XPS Dmves thatPd02 easily reduced PdO and Pdby CO andH,.whieh related thedeactivationofPd/NaZSM一5 catalyst forCO