分级结构卷心菜叶形磷酸铈材料的制备及性能

以β-环糊精(β-CD)为结构导向剂,通过水热处理合成出具有分级结构的卷心菜叶形磷酸铈纳米纤维。通过X射线衍射、扫描电子显微镜、透射电子显微镜、傅里叶红外光谱和氮气吸附对材料进行表征。结果表明:合成的磷酸铈是六方和单斜晶型共存的混晶相;具有分级结构的"卷心菜叶"形貌,每个叶片是由宽约5 nm,长达几百到近千纳米不等的纳米纤维组成;推测生长机理为协同自组装控制的定向连接生长;磷酸铈纳米纤维材料作为催化剂在丙烷氧化脱氢制丙烯的催化反应中表现出优秀的催化活性和稳定性。

Preparation and catalytic activity of hierarchical interlinked structure of cabbage-leaf-like cerium phosphate materials

Cerium phosphate nanofibers were synthesized by thermal treatment with the help of the β-cyclodextrin (β-CD) as structure-director. Cerium phosphate materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and N₂ sorption. The results showed that the synthesized cerium phosphate material was mix-crystal of hexagonal and monazite. Cerium phosphate with cabbage-leaf-like morphology was composed of nano-fibers with the width of 5 nm and the length of several of hundreds to thousands nanometer. The proposed formation mechanism was the cooperative self-assembly formation-controlled through oriented attachment growth mechanism. Thus, cerium phosphate materials as catalysts were applied for the oxidative dehydrogenation (ODH) of propane and exhibited significant catalytic performance and stability.