碳化木负载聚苯胺型微波响应催化剂用于高效5-甲基糠醛合成（英文）

Natural wood templated polyaniline catalysts for energy efficient saccharide-HMF conversion

笔者成功合成碳化木负载聚苯胺复合催化剂用于微波援助果糖催化转化反应。碳化木的表面性质经过空气氧化法和化学氧化法改性,从而提升聚苯胺在载体表面的稳定。通过利用多种表征手段,研究了碳载体和催化剂的结构演变以及聚苯胺的表面形貌、组成。通过结合空气氧化和化学氧化过程,聚苯胺的负载量从原始的1%显著提升到8%。试验结果显示,碳载体表面的羟基不仅促进了聚苯胺在表面的生长,且提高了碳载体在水中的吸波能力。在微波援助果糖催化转化反应中,复合催化剂表现了较好的吸波特性,从而提升其反应温度。在30 min内复合催化剂使得5-甲基糠醛的产率达到70%。这种整体型催化剂易于回收与再生,具有优异的重复使用性。

Wood templated carbon/polyaniline (PANI) hybrid catalyst was successfully synthesized through microwave-assisted fructose conversion reactions.The surface property of carbonized wood was modified via a series of oxidation and carbonization processes to improve the anchoring of polyaniline on the surface.Various characterization techniques were used to study the microstructure evolution and surface composition of carbon frame as well as the polyaniline morphology and composition .By coupling air oxidation and chemical-treatment of carbon support,the PANI loading significantly enhanced from about 1 wt% to 8 wt%.The results showed that the presence of the hydroxyl groups on carbon support not only promoted the PANI deposition on the carbon frame but also enhanced its microwave absorption ability in the aqueous media.In the fructose dehydration reaction,the hybrid showed better microwave absorption and consequently about 36% higher reaction temperature.The hybrid catalyst achieved 70% 5-hydroxymethylfurfural yield within 30-min reaction.In addition,the bulk catalyst can be easily recycled and conveniently reactivated for multiple reaction cycles.