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首页> 外文期刊>RSC Advances >Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co2+
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Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co2+

机译：通过介孔刻蚀的埃洛石纳米管负载的Co2 +将氧有效地将环己烯与氧气有效地无溶剂氧化为烯丙基产物

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One dimensional mesoporous etched halloysite nanotube supported Co ~(2+) is achieved by selective etching of Al _(2) O _(3) from halloysite nanotube (HA) and immersing the etched HA (eHA) into the Co(NO _(3) ) _(2) ·6H _(2) O solution consecutively. By facilely tuning the etching time and the weight ratio of Co(NO _(3) ) _(2) ·6H _(2) O to eHA, the morphology, specific surface area and the supported Co ~(2+) content of the mesoporous material can be tuned. The method for mesoporous material is scaled up and can be extended to other clay minerals. The mesoporous eHA supported Co ~(2+) is used as catalyst for the selective catalytic oxidation of cyclohexene in solvent-free reaction system with O _(2) as oxidant. The results shows the catalytic activity is dependent on etching time, weight ratio of Co(NO _(3) ) _(2) ·6H _(2) O to eHA, calcination treatment and reaction time/temperature. Among them, mesoporous eHA supported Co ~(2+) prepared with 18 h etching time and 2?:?1 Co(NO _(3) ) _(2) ·6H _(2) O/eHA weight ratio without calcination (HA/HCl-18 h/Co ~(2+) -2?:?1) demonstrates the highest catalytic activity under 75 °C reaction temperature and 18 h reaction time (58.30% conversion and 94.03% selectivity to allylic products). Furthermore, HA/HCl-18 h/Co ~(2+) -2?:?1 has exhibit superior cycling stability with 37.69% conversion and 92.73% selectivity to allylic products after three cycles.
机译：通过从埃洛石纳米管（HA）选择性腐蚀Al _（2）O _（3）并将浸蚀后的HA（eHA）浸入Co（NO_（ 3））_（2）·6H _（2）O解。通过轻松地调整蚀刻时间和Co（NO _（3）__（2）·6H _（2）O对eHA的重量比，可以形貌，比表面积和负载的Co〜（2+）含量介孔材料可以调节。介孔材料的方法按比例放大，可以扩展到其他粘土矿物。介孔的eHA负载的Co〜（2+）用作无溶剂反应体系中以O _（2）为氧化剂的环己烯选择性催化氧化的催化剂。结果表明，催化活性取决于刻蚀时间，Co（NO_（3）_（2）·6H _（2）O与eHA的重量比，煅烧处理和反应时间/温度。其中，介孔eHA负载的Co〜（2+）以18 h的蚀刻时间和2？：？1 Co（NO _（3））_（2）·6H _（2）O / eHA的重量比进行了煅烧（在75℃反应温度和18小时反应时间下，HA / HCl-18h / Co〜（2 +）-2′：→1显示出最高的催化活性（转化率58.30％，对烯丙基产物的选择性为94.03％）。此外，HA / HCl-18h / Co〜（2+）-2：→1具有优异的循环稳定性，在三个循环后具有37.69％的转化率和对烯丙基产物的选择性92.73％。

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