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%.
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)
出处
《沈阳化工大学学报》
CAS
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)。
关键词
MoVTeNbO
双模板剂
介孔结构
丙烯氧化
MoVTeNbO
double templating agent
mesoporous structure
propylene oxidation
作者简介
李双明(1982-),男,山西平遥人,副教授,博士,主要从事金属氧化物构效关系的研究;通信联系人:于三三(1971-),男,安徽安庆人,教授,博士,主要从事催化材料设计、制备及催化性能的研究.
