摘要
以尿素/氯化胆碱形成的离子型低共熔混合物溶剂作为反应介质,采用离子液体热合成法制备磷酸氧钒材料.傅里叶变换红外光谱(IR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、能量弥散X射线谱(EDS)和氧化还原滴定表征结果表明:该材料为无定型的、混合价态的纳米尺寸钒磷酸盐,因此可暴露更多的活性位,从而提高催化活性.将其用于环己醇氧化反应,研究反应时间、温度、反应物配比等因素对反应的影响,最终使环己酮的选择性及收率分别达到93.5%和51.4%.
A vanadium phosphate catalyst was prepared through the ionothermal synthesis method in a deep eutectic solvent( DES) which was composed of urea and choline chloride. The results of FT-IR,XRD,EDS,redox titration and SEM measurements showed that the catalyst was an amorphous,mixed-valences and nano-sized vanadium phosphate. Thus it exhibited excellent performance for the selective oxidation reaction of cyclohexanol to cyclohexanone. Through optimization of the reaction conditions such as the molar ratios of H2O2 to cyclohexanol,reaction times and temperatures,the selectivity and yield of cyclohexanone reached 93. 5% and 51. 4%,respectively.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2014年第2期105-111,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金(21203081)
关键词
离子液体热合成
低共熔混合物
磷酸氧钒
环己醇
环己酮
ionothermal synthesis
eutectic mixture
vanadium phosphate
cyclohexanol
cyclohexanone
