Ni-Cu-Mn-K/γ-Al_2O_3高温变换催化剂的结构和性能表征  

Multiple-metal (Ni-Cu-Mn-K/γ-Al_2O_3) Catalysts for High-temperature Water Gas Shift Reaction:Preparation by Equi-volumetic Impregnation and Characterization

作　　者：叶炳火[1] 江莉龙[1] 魏可镁[1] 林诚[2] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福州350002 [2]福州大学化学化工学院,福州350002

出　　处：《无机化学学报》2007年第8期1358-1364,共7页Chinese Journal of Inorganic Chemistry

基　　金：福建省自然科学基金计划资助项目(No.U0650011);福州大学科技育苗基金(No.2005-XY-05)资助项目。

摘　　要：以γ-Al2O3为载体,采用二步等体积浸渍法,制备了Ni-Cu-Mn-K/γ-Al2O3高温水煤气变换催化剂。采用低温氮吸附-脱附,DTA,XRD,H2-TPR等方法对催化剂进行了表征,比较了载体、单组分、双组分、以及多组分浸渍的样品结构及各物种的存在形式,探讨了催化剂的活性相组成。结果表明,所制备的催化剂具有较大的比表面积,孔径呈介孔分布结构;低温时,催化剂活性相主要为高度分散的Cu、Ni、Ni-Cu-O、xCuO·yMnO2和xNiO·yMnO2复合氧化物;高温时,活性相可能为xCuO·yMnO2和xNiO·yMnO2等复合氧化物。经530℃耐热15h后催化活性测试结果分析认为,活性相xCuO·yMnO2和xNiO·yMnO2等复合氧化物提高了该催化剂的热稳定性。　Using γ-Al2O3 as a support,a multiple-metal （Ni-Cu-Mn-K/γ-Al2O3） catalyst for high-temperature water gas shift reaction was prepared by the two-step impregnation method. The physical-chemical properties of the catalyst were studied by means of Low temperature nitrogen adsorption-desorption,XRD,DTA and H2-TPR. It is demonstrated that the catalyst has larger specific surface areas with middle pore structure and that Cu,Ni,Ni-Cu-O,xCuO·yMnO2 and xNiO·yMnO2 etc are the active species at low temperature,while at high temperature,the active species are probably complex oxides like xCuO·yMnO2 and xNiO·yMnO2 etc.,which improve thermal stability of the catalyst and eliminate the deactivation problem of Cu and Ni due to the sintering at high temperature.

关 键 词：水煤气变换 Ni-Cu-Mn-K/γ-Al2O3 等体积浸渍法 催化剂表征 

分 类 号：O643.3[理学—物理化学] O614.3[理学—化学]