Ru纳米颗粒包覆ITO纳米线热解纤维素性能研究

Pyrolysis Properties of Cellulose by ITO Nanowires Coated with Ru Nanoparticles

以阳极氧化铝(AAO)膜为模板,采用真空机械压注法制备铟锡(InSn)合金纳米线(NWs),然后采用“原位放电还原”方法在InSnNWs表面包覆Ru颗粒。随后,将复合材料在空气中进行热处理,合成RuO2/ITONWs。最后,在H2气氛下还原RuO2/ITO NWs获得Ru/ITO NWs。结果表明,InSn纳米线直径约为40 nm,2~5 nm的Ru纳米颗粒均匀地包覆在ITO NWs的表面。此外,检测了所得Ru/ITO NWs对纤维素的催化热解性能,所得产物为1,6-脱水吡喃葡萄糖、乙醇醛和羟基丙酮,对比无催化剂、ITO NWs,Ru/ITO NWs所得产物,可以发现Ru/ITO NWs催化剂减少了1,6-脱水吡喃葡萄糖的产生,表明Ru纳米颗粒加剧了热解过程中氧桥的断裂,加速生成乙醇醛和羟基丙酮,提高纤维素热解效率。同时对存在醚键的壬基酚聚氧乙烯醚也进行了热解分析,结果表明Ru/ITO NWs对醚键的断裂起明显的催化作用,减少中间态纤维素的产生,实现快速热解纤维素的目的。

Indium tin(InSn)alloy nanowires(NWs)were prepared using anodic aluminum oxide(AAO)film as template by vacuum mechanical injection method.Ru particles were then coated on the surface of InSn NWs by the“in situ discharge reduction”method.Subsequently,the RuO2/ITO NWs was obtained by heat treatment for the composite material.Finally,RuO2/ITO NWs were reduced in H2 atmosphere to obtain Ru/ITO NWs.The results indicate that the diameter of InSn NWs is about 40 nm and Ru nanoparticles of 2-5 nm are uniformly coated on the surface of ITO NWs.In addition,the catalytic pyrolysis of cellulose by Ru/ITO NWs is tested and the main products are 1,6-anhydropyranose,glycolaldehyde,and hydroxyacetone.Compared the catalysate of ITO NWs without catalysts,Ru/ITO NWs catalyst reduces the production of 1,6-anhydropyranose,which indicates that Ru nanoparticles exacerbate the fracture of oxygen bridges during pyrolysis,accelerate the generation of glycolaldehyde and hydroxyacetone,and thus improve the pyrolysis efficiency.At the same time,the pyrolysis of nonylphenol polyoxyethylene ether with ether bonds was also carried out,and the result shows that Ru/ITO NWs plays a significant role in the fracture of ether bonds,which reduce the formation of intermediate cellulose and realizes the rapid pyrolysis of cellulose.