【摘要】 以磷钼酸和氯化铯为原料、三嵌段共聚物F127为模板剂制备Keggin型介孔Cs₃PMo₁₂O₄₀（简称m-Cs₃PMo）,通过X射线粉末衍射（XRD）、FT-IR、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、N₂吸附-脱附测试和小角X射线散射（SAXS）对催化剂的组成、结构、形貌进行了表征。结果表明,m-Cs₃PMo属于立方相晶系,具有2.5和6.0 nm的蠕虫状介孔。以m-Cs₃PMo为催化剂考察其水相中D-葡萄糖、D-木糖和L-阿拉伯糖差向异构化反应的催化性能,并研究了反应温度、时间和催化剂用量对D-葡萄糖差向异构化反应的影响以及催化剂的循环使用性能,在循环使用过程中m-Cs₃PMo表现出良好的稳定性。更多还原

【Abstract】 Keggin-type mesoporous Cs₃PMo₁₂O₄₀（m-Cs₃PMo） has been prepared by using H₃PMo₁₂O₄₀and CsCl as starting materials and amphiphilic triblock copolymer F127 as a template.The composition,structure,and morphology were characterized by powder X-ray diffraction （XRD）,FT-IR,field emission scanning electron microscopy（FESEM）,transmission electron microscope （TEM）,N₂ adsorption-desorption test,and small-angle X-ray scattering（SAXS）.The results show that m-Cs₃PMo belongs to the cubic lattice system and owns 2.5 and 6.0 nm wormlike mesoporous pores.The catalytic activity of m-Cs₃PMo in aqueous epimerization of D-glucose,D-xylose,and L-arabinose was investigated.The effects of temperature,time,and catalyst amount on the D-glucose epimerization reaction and the recycling performance of the catalyst were also studied.During the recycling process,the catalyst activity and product selectivity did not decrease significantly,which showed good stability of m-Cs₃PMo.更多还原