立方氮化铝纳米晶的溶剂热合成及其对二甲苯催化性质的研究

Solvent-thermal Synthesis of Cubic AlN Nanocrystals and Their Catalytic Effect on Xylene

低温 (2 80℃ )条件下 ,通过二甲苯中AlCl3 和NaN3 的反应制备出了AlN纳米微粒。 70 0℃退火 4 8h后 ,得到了纯的立方相AlN纳米晶。通过XRD、FTIR和定域电子衍射分析 ,验证了立方相AlN纳米晶的生成。经XRD和TEM分析 ,纳米晶的平均粒度约为 3nm。色质联 (GC MS)检测结果显示 ,由于AlN纳米颗粒对二甲苯的催化作用 ,使二甲苯发生聚合和杂化环反应 ,得到了二联苯、萘、蒽、三甲基咔唑及咔唑胺等多环芳烃。作为对比实验 ,分别研究了NaN3 和AlCl3 对二甲苯的催化性能 。

AlN nanoparticles were successfully synthesized by the reaction of AlCl_3 and NaN_3 in organic solvent at low temperature( 280℃). After sintered at 700℃ for 48h, pure phase cubic AlN nanocrystals were produced. The results of X-ray diffraction, Fourier transformation infrared spectroscopy and selective area electron diffraction confirmed that pure phase cubic AlN was prepared by this method. The morphology shows that the particles are in cubical shape and the average size is about 3 nm. Owing to the catalytic effect of AlN nanocrystals, part of xylene is converted at 280℃ into a series of polymers, mainly including 3,4-dimethyl-1,1'-biphenyl, 3,3',5,5'-tetramethyl-1,1'biphenyl, naphthalene, anthracene and trimethyl-carbazole. As contrastive experiment, the catalytic effects of AlCl_3 and NaN_3 were also studied, and no polymers are found.