NH4F改性Mo/HZSM-5催化剂上的甲烷无氧芳构化反应:预处理温度影响的进一步研究

 进一步研究了HZSM-5分子筛的NH4F预处理温度对制得的Mo/HZSM-5催化剂的影响. X射线衍射和魔角旋转固体核磁共振(27Al MAS NMR)的表征结果表明, NH4F预处理后的HZSM-5分子筛上发生了部分脱铝,在 27Al MAS NMR谱中δ=-12.7 处出现了宽化峰,可归属为AlO6-xFx的特征峰. Mo/HZSM-5样品的NH3程序升温脱附与 27Al MAS NMR结果均表明, MoO3与经NH4F预处理的HZSM-5的相互作用增强,而且该作用随NH4F预处理温度的升高而加大. 经NH4F预处理的Mo/HZSM-5催化剂显示出良好的抗积碳性能,这不仅与载体B酸量的减少有关,而且与催化剂上MoCx/MoCxOy与载体B酸量的匹配有关.     

Metal-Free and Mild Synthesis of 2,4-Diarylquinolines

We have developed a useful method to synthesize quinoline derivatives, which required no transition metals, no peroxides, and no high temperatures. This method provides a novel and gentle synthetic route for various multifunctional 2,4-diarylquinolines with good yields.