糠醛加氢制糠醇中Cu-Zn/γ-AL_2O_3催化剂的改性研究  

Study on Modification of Cu-Zn/γ-Al_2O_3 Catalysts of Hydrogenation of Furfural to Furfuryl Alcohol

作　　者：张定国[1] 刘芬[1] 李发亮[1] 杨婥[1] 

机构地区：[1]东华理工大学化学生物与材料科学学院,江西抚州344000

出　　处：《化学反应工程与工艺》2007年第2期136-140,182,共6页Chemical Reaction Engineering and Technology

基　　金：江西省自然科学基金资助项目(0520002);抚州市科技攻关计划项目(2004727)

摘　　要：采用浸渍法制备γ-Al_2O_3负载Cu-Zn催化剂并用Co改性.考察了Cu-Zn负载量、Co用量、反应温度和质量空速对催化剂性能的影响.对催化剂进行100h的稳定性评价实验,并采用X射线衍射仪(XRD)对催化剂进行表征.实验结果表明.当Cu,Zn,Al和Co的摩尔比为1.00:2.00:3.00:0.51时.Cu-Zn/γ-Al_2O_3(Co)的催化性能和稳定性比较好.在413K,氢气流速为0.5mL/s,糠醛空速为2h^(-1)条件下,糠醇的选择性达100%,糠醛转化率达94.6%,比使用单纯Cu-Zn/γ-Al_2O_3催化剂的转化率提高11%。催化剂中Cu晶相是催化活性中心.Co的加入抑制了Cu的氧化.提高了催化剂的活性和稳定性.Cu-Zn/γ-Al2O3 catalysts with Cu and Zn supported on γ-A12O3 were prepared by impregnation method and were modified by adding Co （the modified catalyst was called Cu-Zn/γ-A12O3 （Co））. Effects of amount of Cu, Zn cand Co, reaction temperature and space velocity on the performance of Cu-Zn/γ-A12O3 （Co） were investigated in a fixed-bed and 100 h stability tests of the catalyst were carried out. The experimental results showed that the optimal molar ratio of Cu, Zn, Al to Co in the Cu-Zn/γ-A12O3 （Co） was 1.00：2.00：3.00：0.51. Under the reaction conditions that reaction temperature was 413 K, rate of flow of H2 was 0.5 mL/s and space velocity of furfural was 2 h^-1 , conversion of furfural and selectivity of furfuryl alcohol were 94.6% and 100% respectively. The structure of the catalysts was characterized by X-ray diffraction patterns （XRD）. Cu crystal in Cu-Zn/modified γ-A12O3 was the catalytic activity centre of Cu-Zn/γ-A12O3 catalyst and Co added could suppress oxidation of Cu and improve the activity and stability of the Cu-Zn/γ-A12O3 （Co） catalyst.

关 键 词：铜 锌 钴 负载催化剂 改性 糠醛 糠醇 

分 类 号：TQ426.83[化学工程] O643.38[理学—物理化学]