摘要
采用微波晶化法合成了三元CuMgAl类水滑石化合物前体,进一步在微波作用下制备了负载VO3-,MoO42-和WO42-的类水滑石催化剂.X射线衍射、红外光谱和扫描电镜结果表明,酸根离子很好地负载在类水滑石表面.苯酚羟化反应结果显示,前体中Cu2+/Mg2+摩尔比为3:1时其催化性能最佳,苯酚转化率达到42.8%,邻/对比接近2:1.负载VO3-后催化剂活性升高,苯酚转化率最高达59.2%,而邻对比降为1.2:1.负载MoO42-的类水滑石与前体相比,苯酚转化率下降了约4%,但对苯二酚的选择性有较大提高,邻/对比达到1:6.而负载WO42-后催化剂活性和选择性明显下降.
Under microwave irradiation, the ternary CuMgAI precursor was synthesized, and furthermore VO3^-, MoO4^2-, and WO4^2- were supported on its surface. The catalysts obtained were characterized by X-ray diffraction, fourier transform infrared spectroscopy, and scanning electron microscopy. The results of phenol hydroxylation indicate that the precursor with the Cu^2＋/Mg^2＋ molar ratio of 3：1 has the highest activity, and the phenol conversion is up to 42.8% with the ratio of catechol to hydroquinone being 2：1. CuMgAl-supported VO3^- can increase phenol conversion up to 59.2% while the ratio of catechol to hydroquinone declines to 1.2：1. CuMgAl-supported Mo4^2- can advantageously improve the selectivity for hydroquinone with the ratio of hydroquinone to catechol over 6：1 while the conversion just decreases about 4%. The conversion and selectivity for phenol hydroxylation catalyzed by CuMgAl-supported WO4^2- are even lower than those of its precursor.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2009年第3期201-206,共6页
基金
中石油吉林石化公司科技开发项目
关键词
类水滑石
微波
负载型催化剂
苯酚
羟化
hydrotalcite-like compound
microwave
supported catalyst
phenol
hydroxylation
