不同形貌的Cu/MgO一步气相法催化合成MIBK  

One-step vapor phase synthesis of MIBK over different shapes of Cu/MgO

作　　者：宁静 胡子圆 NING Jing;HU Zi-yuan(Western Metal Materials Co.,Ltd.,Xi’an 710201,China)

机构地区：[1]西部金属材料股份有限公司,陕西西安710000

出　　处：《化学研究与应用》2023年第6期1377-1386,共10页Chemical Research and Application

基　　金：西安市博士后创新基地资助项目资助;陕西省科学技术协会青年人才托举计划项目(NYHB202202)资助。

摘　　要：使用三种不同形貌的氧化镁纳米材料(纳米片、纳米盘、纳米纤维)分散铜,高分辨透射电子显微镜(HRTEM)分析表明,CuO在三种载体上以高度分散的无定型形式存在。将Cu/MgO催化剂用于丙酮气相缩合和选择性加氢制甲基异丁基酮(MIBK)的反应,结果发现其催化性能与CO_(2)-TPD测量结果以及MgO纳米材料上铜物种的分散性相关。催化剂表面碱性位的总数和密度遵循以下大小顺序:Cu/MgO纳米片>Cu/MgO纳米盘>Cu/MgO纳米纤维。催化丙酮转化时,Cu/MgO纳米片的丙酮转化率和反应速率远高于Cu/MgO纳米盘和纳米纤维,这主要归功于其表面大量的碱性位位点,同时,Cu/MgO纳米片最大的Cu的比表面积提高了其MIBK产率。Three different morphologies of MgO nanomaterials(MgO nanosheets,nanodisks,nanofibers)were used as supports to disperse copper.HRTEM(high-resolution transmission electron microscopy)results showed that CuO species were highly dispersed on the three supports.The vapor phase condensation and selective hydrogenation of acetone to methyl isobutyl ketone(MIBK)were carried out on Cu/MgO catalysts and the catalytic properties are correlated with the results of CO_(2)-TPD measurements and also with the dispersion of the copper species supported on MgO nanomaterials.The total number and the surface density of the basic sites followed the order Cu/MgO nanosheets>Cu/MgO nanodisks>Cu/MgO nanofibers.When being used to catalyze the conversion of acetone,the Cu/MgO nanosheets showed much higher acetone conversion and reaction rate than the Cu/MgO nanodisks and nanofibers,primarily because of its largest numbers of surface basic sites.And the highest Cu surface area of Cu/MgO nanosheets enhanced its MIBK yield.

关 键 词：丙酮加氢 甲基异丁基酮 碱性位 铜比表面积。 

分 类 号：O614.1[理学—无机化学]