沉积-沉淀法制备Pd-Cu/凹凸棒土催化剂及其常温潮湿环境下CO催化氧化性能  

Preparation of Pd-Cu/APT catalyst via deposition-precipitation method and its behaviors for CO oxidation under room temperature and humid circumstances

作　　者：徐亚琳[1] 李潇[1] 吕婷婷[1] 张晋熙 王永钊[1] 赵永祥[1] Xu Yalin Li Xiao Lu Tingting Zhang Jinxi Wang Yongzhao Zhao Yongxiang(School of Chemistry and Chemical Engineering,Engineering Research Center for Fine Chemicals of Ministry of Education, Shanxi University, Taiyuan 030006, Shanxi, Chin)

机构地区：[1]山西大学化学化工学院精细化学品教育部工程研究中心,山西太原030006

出　　处：《工业催化》2017年第5期28-32,共5页Industrial Catalysis

基　　金：国家自然科学基金(21673132)资助项目;山西省重点研发计划(201603D121018-1)资助项目

摘　　要：采用沉积-沉淀法制备Pd-Cu/凹凸棒土(PC/APT)催化剂,以CO氧化为探针反应,在连续流动微反装置上考察其常温潮湿环境下CO催化氧化性能。作为对比,同时采用常规浸渍法制备催化剂。通过N2物理吸附-脱附、XRD、FT-IR和TPR等对催化剂结构和性质进行表征。结果表明,与浸渍法制备的催化剂不同,采用沉积-沉淀法制备的PC/APT催化剂上Cu物种分别以Cu_2Cl(OH)_3和CuO形式存在,其中,Cu_2Cl(OH)_3物种与Pd物种间相互作用较强,催化剂还原性能显著提高,表现出良好的CO催化氧化活性。在空速6 000 h^(-1)、CO体积分数0.5%和水蒸汽体积分数3.3%条件下,采用沉积-沉淀法制备的PC/APT催化剂上CO转化率大于84%的时间不低于160 min。Pd -Cu/attapulgite catalyst （PC/At-） was prepared by deposition -precipitation method and its behaviors for CO oxidation under room temperature and humid circumstances was investigated in a fixed -bed continuous flow reactor using CO oxidation under room temperature and humid circumstances as the probe reaction. Pd - Cu/APT catalyst prepared by impregnation method was used as a reference. Structure and properties of the as - synthesized catalysts were characterized by N2 - physisorption, XRD, FT - IR and TPR. The results showed that, unlike the catalyst prepared by impregnation, Cu species existed as Cu2C1（OH） 3 and CuO, respectively, on PC/APT catalyst prepared by deposition - precipitation. The strong interaction between Pd species and CUzCI（OH） 3 significantly enhanced reducibility of the catalyst, resulting in exeellent catalytic activity for CO oxidation. Under reaction condition of CO 0.5vol% , GHSV 6 000 h^-1 ,water content 3.3vol% and room temperature, CO conversion over PC/APT catalyst prepared by deposition -precipitation remained at more than 84% for not less than 160 min.

关 键 词：催化化学 Pd-Cu/凹凸棒土 沉积-沉淀法 CO催化氧化 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]