双模板剂合成介孔MoVTeNbO复合金属氧化物及其催化性能研究  

Synthesis of Mesoporous MoVTeNbO Composite Metal Oxides with Dual Templates and Their Catalytic Performance

作　　者：李双明 王宇娇 张杰 陈雅南 王一雯 刘东琦 于三三 LI Shuangming;WANG Yujiao;ZHANG Jie;CHEN Yanan;WANG Yiwen;LIU Dongqi;YU Sansan(Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2023年第5期410-420,共11页Journal of Shenyang University of Chemical Technology

基　　金：辽宁省“兴辽英才计划”科技创新领军人才项目(XLYC2002001);沈阳市中青年科技创新人才支持计划(RC210184)。

摘　　要：分别使用PEG/CTAB以及OP/CTAB为双模板剂,诱导合成了具有介孔结构的MoVTeNbO复合金属氧化物催化剂,并将其应用于丙烯选择性氧化制丙烯酸.结果表明:使用双模板剂CTAB/PEG,且当n(Mo)∶n(V)∶n(Te)∶n(Nb)∶n(PEG)∶n(CTAB)=1∶0.34∶0.22∶0.13∶0.056∶0.047时,能够诱导MoVTeNbO复合金属氧化物形成分布均一的介孔结构,孔径分布集中在4~10 nm,孔容为0.058 cm^(3)/g;采用OP/CTAB为双模板剂时,添加不同比例的模板剂均能诱导合成具有明显介孔结构的MoVTeNbO复合金属氧化物催化剂,而且当n(Mo)∶n(V)∶n(Te)∶n(Nb)∶n(OP)∶n(CTAB)=1∶0.34∶0.22∶0.13∶0.011∶0.044时,合成的OP-2催化剂孔径分布集中在7~14 nm,孔容为0.132 cm^(3)/g;在催化丙烯氧化制丙烯酸反应中表现出良好的催化活性,对丙烯酸的选择性最高可达82%,与不使用OP/CTAB制备的催化剂相比,对丙烯酸的选择性提高了至少22.78%.Cetyltrimethylammonium bromide(CTAB)and polyethylene glycol(PEG),as well as CTAB and polyethylene glycol octylphenylmethylene(OP)were used as dual templating agents to induce the synthesis of MoVTeNbO composite metal oxide catalysts with mesoporous structure.The synthesized catalysts were applied to the selective oxidation of propylene to acrylic acid.The results show that when using the dual template agents CTAB and PEG,MoVTeNbO composite metal oxide can be induced to form a mesoporous structure with uniform pore size distribution concentrated at 4-10 nm and pore volume of 0.058 cm^(3)/g under n(Mo)∶n(V)∶n(Te)∶n(Nb)∶n(PEG)∶n(CTAB)=1∶0.34∶0.22∶0.13∶0.056∶0.047.When CTAB and OP were used as dual template agents with different concentrations,mesoporous MoVTeNbO catalysts could also be induced to synthesize,in which,when n(Mo)∶n(V)∶n(Te)∶n(Nb)∶n(PEG)∶n(CTAB)=1∶0.34∶0.22∶0.13∶0.011∶0.044,the pore size distribution was concentrated in the range of 7-14 nm with pore capacity of 0.132 cm^(3)/g.The synthesized catalyst showed good catalytic activity in the oxidation of propylene to acrylic acid,the selectivity of acrylic acid could reach up to 82%.Compared with the catalyst prepared without CTAB and OP,the selectivity of acrylic acid was increased by at least 22.78%.

关 键 词：MoVTeNbO 双模板剂 介孔结构 丙烯氧化 

分 类 号：TQ230.4[化学工程—有机化工]