采用油菜花粉为生物模板、LDHs晶核溶液为前驱体,通过共沉淀、辅助微波晶化方法,经原位生长和煅烧,简单温和地合成了ZnAlCe三元复合氧化物多孔材料。采用SEM、FT-IR、XRD、EDX、XPS和N2吸附-脱附分析等对其进行形貌与结构的表征,并对其催化H2O2-α-蒎烯环氧化反应进行了测定。结果表明, ZnAlCe三元复合氧化物能复制花粉模板表面的微纳米结构,多级孔有序排列,孔径分布在2~150 nm 范围的介孔与大孔尺寸之间,比表面积达112.94 m2/g,具有良好的结晶度,晶型规整；当α-蒎烯/H2O2摩尔比为1：1.4、催化剂用量为15.0 mg、溶剂(乙酸乙酯/H2O体积比=4：1)为2 mL、30℃下反应4 h时,α-蒎烯转化率可达61.81%,产物2,3-环氧蒎烷、马鞭草烯醇和马鞭草烯酮的选择性分别为40.54%、27.36%、32.10%。
Porous ZnAlCe ternary composite oxide was successfully prepared by a simple and mild technology based on microwave-crystallization and co-precipitation through in situ growth and calcination using rape pollen as biotemplate and LDHs as precursors. Morphology and structure of the as-prepared sample were characterized by SEM, FT-IR, XRD, EDX, XPS and N2 adsorption and desorption analysis. The results show that the synthesized ZnAlCe ternary composite oxide can copy micro and nano structure of the rape pollen surface and form hierarchical holes with the pore size within 2–150 nm, between mesoporous and macroporous, and the specific surface area at 112.94 m2/g. Moreover, ZnAlCe ternary complex oxide has good crystallinity and crystal structure. The porous com-plex oxide ZnAlCe was then applied to catalyzeα-pinene oxidation using 30wt%hydrogen peroxide as oxidant. It is showed that theα-pinene conversion rate reaches 61.81%, and the selectivity of 2, 3 epoxypinane, verbenol, verbe-none is 40.54%, 27.36% and 32.10%, respectively, under the α-pinene/H2O2 molar ratio of 1∶1.4 using 15.0 mg ZnAlCe as catalyst being dissolved in 2 mL ethyl acetate/H2O (volume ratio was 4∶1) at 30℃ for 4 h.
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