钼/钒-白云石双功能催化剂催化甘油脱水-氢转移制烯丙醇  

Dehydration-hydrogen transfer of glycerol to allyl alcohol over bifunctional molybdenum/vanadium-dolomite catalyst

作　　者：朱保 付超鹏 李科金 裘敏洋 李承苍 周春晖[1] ZHU Bao;FU Chaopeng;LI Kejin;QIU Minyang;LI Chengcang;ZHOU Chunhui(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014

出　　处：《高校化学工程学报》2023年第5期787-797,共11页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(22072136)。

摘　　要：采用浸渍法制备同时具有碱性位点和氧化还原位点的MoO/VO-CD-T(CD为煅烧白云石,T为煅烧温度)双功能催化剂。结果表明,催化剂表面钼/钒氧化物主要由MoO3和V_(2)O_(5)组成;煅烧白云石与钼、钒氧化物之间形成不同的物相,可进一步调节催化剂稳定性和氧化还原性能。在空气气氛下CD-500负载的V_(2)O_(5)催化剂更有利于烯丙醇形成,主要是因为空气中氧气的存在会抑制高价态钒的还原;而CD-500负载钼的氧化物对烯丙醇的活性较低,因为Mo^(6+)的还原能力弱。以质量分数为20%的甘油溶液为原料,在反应温度为320℃的条件下,2%VO-CD-500催化剂(2%为VO的质量分数)催化性能相对最佳,甘油转化率为52.4%,烯丙醇选择性为37.4%。Bifunctional catalysts MoO/VO-CD-T(CD:calcined dolomite and T:calcined temperature)with both basic sites and redox sites were prepared by impregnation method.The results showed that the molybdenum/vanadium oxides on the catalyst surface were mainly composed of MoO3 and V_(2)O_(5),and the formation of different phases between calcined dolomite and molybdenum/vanadium oxides could adjust the stability and redox performance of the catalyst.The allyl alcohol was more favorable to be formed over the VO-CD-500 catalyst in air atmosphere,mainly because the oxygen in air could inhibit the reduction of high-valence vanadium.The MoO-CD-500 catalyst had a low activity to allyl alcohol because the reducibility of Mo^(6+) was weak.2%VO-CD-500 catalyst showed the best catalytic performance under the condition of 20%glycerol solution and reaction temperature of 320℃,with a glycerol conversion of 52.4%and a selectivity to allyl alcohol of 37.4%.

关 键 词：甘油 钼/钒氧化物 脱水-氢转移 烯丙醇 煅烧白云石 

分 类 号：TQ465.92[化学工程—制药化工]