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以甲胺水溶液为改性剂,H-Y沸石可在416K下经水热反应制备酸碱双功能甲胺杂化H-Y沸石.X射线粉末衍射(XRD),固体29Si魔角核磁共振(29SiMAS NMR)表征表明甲胺分子与H-Y相互作用导致沸石晶胞体积明显增大,骨架产生新的Si—N键.以热重(TG/DTG)及差热分析(DTA),NH3,CO2程序升温脱附(NH3-TPD和CO2-TPD)研究杂化H-Y沸石的酸-碱性质及其经不同温度焙烧后的变化,结果表明,杂化后沸石的酸/碱量,尤其是后者增加甚大.与H-Y相比,随焙烧温度变化,该酸-碱双功能沸石材料的酸/碱量可分别提高3至7倍和1.5至26倍.
With methylamine aqueous solution as modifier, HY zeolite can be prepared by hydrothermal reaction at 416K for acid-base bifunctional methylamine hybrid HY zeolite.X-ray powder diffraction (XRD) and solid 29Si magic angle nuclear magnetic resonance (29SiMAS NMR) The results showed that the interaction between methylamine and HY resulted in the obvious increase of unit cell volume and the formation of new Si-N bonds in the framework.The thermogravimetry (TG / DTG) and differential thermal analysis (DTA) NH3-TPD and CO2-TPD) were used to investigate the acid-base properties of hybrid HY zeolites and their calcination at different temperatures. The results showed that the acid / alkali content of zeolites increased especially after hybridization, In comparison with the calcination temperature, the acid / base bifunctional zeolitic material can increase the acid / base amount by 3 to 7 times and 1.5 to 26 times respectively.