Pd-Cu/羟磷灰石的制备及常温常湿CO催化氧化性能  

Preparation and Characterization of Pd-Cu/hydroxyapatite Catalyst and Its Catalytic Performance for Room-temperature CO Oxidation in Humid Circumstances

作　　者：李潇[1,2] 邢莉莎 赵婉君 王永钊 赵永祥[1] LI Xiao;XING Lisha;ZHAO Wanjun;WANG Yongzhao;ZHAO Yongxiang(Engineering Research Center of Ministry of Education for Fine Chemicals;School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学精细化学品教育部工程研究中心,太原030006 [2]山西大学化学化工学院,太原030006

出　　处：《高等学校化学学报》2020年第7期1600-1608,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:U1710221);山西省自然科学基金(批准号:201801D121043)资助.

摘　　要：通过溶胶-凝胶法(SG)和水热法(HT)合成了羟磷灰石载体(HAP-SG,HAP-HT),以浸渍法制备负载型Pd-Cu/HAP催化剂(PC-SG,PC-HT),并考察其常温常湿条件下CO催化氧化反应性能.采用电感耦合等离子体发射光谱(ICP-OES)、N2物理吸附-脱附、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、H2程序升温还原(H2-TPR)、CO2程序升温脱附(CO2-TPD)、X射线光电子能谱(XPS)和CO原位漫反射傅里叶变换红外光谱(in-situ DRIFTS)等手段对Pd-Cu/HAP催化剂进行了表征.结果表明,相比于PC-SG,PC-HT具有较大比表面积和孔容,含有较多的Cu2Cl(OH)3物种且与Pd物种和载体直接产生了较强的相互作用;而且PC-HT表面含有较强CO活化能力的Pd^+物种和更多具有较强氧化还原性质的Cu^+物种,以及较少数量和较低强度的碱性位点,因而表现出更加优异的常温常湿条件下CO催化氧化性能.Hydroxyapatite supports(HAP-SG,HAP-HT)were prepared by sol-gel and hydrothermal methods,respectively.Pd-Cu/HAP catalysts(PC-SG,PC-HT)were synthesized by an impregnation method,and the catalytic activities toward CO oxidation at room temperature and in humid circumstances were investigated.The Pd-Cu/HAP catalysts were characterized by inductively coupled plasma optical emission spectrometry(ICP-OES),N 2-physisorption,X-ray diffraction(XRD),Fourier transform infrared(FTIR),H 2 temperature programmed reduction(H 2-TPR),CO 2 temperature programmed desorption(CO 2-TPD),X-ray photoelectron spectroscopy(XPS)and CO in-situ diffuse reflection using Fourier transform spectroscopy(DRIFTS).The results show that compared with PC-SG,PC-HT possesses the larger specific surface area and pore volume,contains more Cu 2Cl(OH)3 species with stronger interactions with Pd species and support;more importantly,Pd^+species with stronger CO activation ability and more Cu^+species with stronger redox property,as well as fewer and weaker basic sites present in PC-HT,thus PC-HT exhibits more excellent CO catalytic oxidation performance for room-temperature CO oxidation in humid circumstances.

关 键 词：钯-铜/羟磷灰石 常温常湿 一氧化碳催化氧化 氧化还原 钯离子物种 

分 类 号：O643.36[理学—物理化学]