摘要
采用共沉淀法合成了 SiO_3^(2-)柱撑的含 Cu 类水滑石化合物(Cu-HTLcs-SiO_3)。X 射线衍射、透射电子显微镜和傅里叶变换红外光谱表征结果显示,Cu-HTLcs-SiO_3具有类水滑石结构,且层板间距大于 Cu-HTLcs-CO_3;Cu-HTLcs-SiO_3具有较好的网状结构,但其晶粒形貌和纹理特征受 n(Mg):n(Al)和n(SiO_3^(2-)):n(OH)的影响,Cu-HTLcs-SiO_3晶粒间的团聚严重影响其催化活性。以苯酚/H_2O_2羟基化为探针反应时发现,Cu-HTLcs-SiO_3的催化性能优于Cu-HTLcs-CO3,以在 Cu 摩尔分数为22.00%、n(Mg):n(Al)=3 00、n(SiO_3^(2-)):n(OH)=0.50的条件下合成的 Cu-HTLcs-SiO_3为催化剂,苯酚的转化率可达31.2%。
The SiO3^2- -pillared Cu-containing hydrotalcite （Cu-HTLcs-SiO3 ） were synthesized by coprecipitation and were characterized by means of XRD, TEM and FrlR. The prepared Cu-HTLcs- SiO3 showed a hydrotalcite-like structure with a larger interlayer space than CO3^2- -pillared Cu-containing hydrotalcite （Cu-HTLcs-CO3 ）, and distinct reticulated texture. However, the granule morphology and reticulated texture of the Cu-HTLcs-SiO3 are affected by mole ratios of Mg to Al and SiO3^2- to OH^-. Aggregation of Cu-HTLcs-SiO3 crystalline granules impacts seriously its catalytic properties. Catalytic activity of Cu-HTLcs-SiO3 is higher than that of Cu-HTLcs-CO3 in phenol hydroxylation with H2O2. Phenol conversion is 31.2% on Cu-HTLcs-SiO3 when mole fraction of Cu 22.00 %, n（Mg）： n（Al） 3.00 and n （ SiO3^2-） ： n （ OH ^- ） 0.50.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2008年第12期1242-1247,共6页
Petrochemical Technology
基金
四川省教育厅青年基金项目(2006C032)
成都信息工程学院发展基金项目(KYTZ20060902)
