制备方法对Ni/Al_2O_3–SiC泡沫结构催化剂Ni分布和苯甲醛加氢性能的影响  

Effect of Preparation Methods on Ni-distribution and Catalytic Performance of Foam Structured Catalyst Ni/Al_2O_3-SiC for Hydrogenation of Benzaldehyde

作　　者：李恺 矫义来[1] 杨振明[1] 张劲松[1] LI Kai;JIAO Yilai;YANG Zhenming;ZHANG Jinsong(Shenyang National Research Center for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]沈阳材料科学国家研究中心中国科学院金属研究所,沈阳110016 [2]中国科学院大学,北京100049

出　　处：《材料研究学报》2018年第11期811-819,共9页Chinese Journal of Materials Research

基　　金：国家重点研发计划重点专项(2017YFB0310405)~~

摘　　要：采用浸渍法和沉积-沉淀法制备了Ni为催化活性组分的Ni/Al_2O_3-SiC泡沫结构催化剂,使用扫描电镜能谱(SEM-EDS)、X射线衍射(XRD)、N2吸附-脱附、透射电镜(TEM)、X射线光电子能谱(XPS)和程序升温还原(H2-TPR)等手段表征结构催化剂,研究了活性组分制备方法对Ni分布、Ni颗粒尺寸、元素价态以及Ni与载体之间相互作用的影响,并考察了用不同方法制备的结构催化剂的苯甲醛液相加氢性能。结果表明,在40℃、160℃和真空冻干三种不同条件下干燥的浸渍型结构催化剂,在其涂层表面出现了不同程度的Ni富集,在160℃干燥的催化剂涂层表面Ni的富集最严重。与浸渍法相比,用沉积-沉淀法制备的结构催化剂其活性组分Ni的分布更均匀,Ni颗粒的尺寸更小,具有更高的苯甲醛加氢性能。The foam structured catalysts of Ni/Al2O3-SiC were prepared via conventional impregnation (IM)and deposition-precipitation (DP)methods.These catalysts were characterized by means of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS),X-ray diffraction (XRD),N2 absorption-desorption,transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS) and H2temperature-programmed reduction (H2-TPR).The effect of preparation methods on the distribution,particle size and valence state of the active component Ni,as well as the interaction between Ni and the supporter was investigated.Furthermore,the catalytic performance of the catalysts prepared by different methods was evaluated for the liquid-phase hydrogenation of benzaldehyde.Results show that the Ni enrichment occurred on the coating surface of three catalysts prepared via impregnating and then dried in air at 40℃ and 160℃,as well as subjected to vacuum freeze-drying,respectively.The foam catalyst dried at 160℃ showed the most serious enrichment of Ni on the coating surface.Compared with the three impregnated foam catalysts,the catalyst prepared by DP method has a uniform Ni distribution and smaller Ni particles size,leading to its higher catalytic performance for hydrogenation of benzaldehyde.

关 键 词：无机非金属材料 催化材料 结构催化剂 AL2O3涂层 Ni分布 苯甲醛加氢 

分 类 号：TQ426[化学工程]