An organic-inorganic hybrid acid-basic bifunctional HY zeolite has been prepared at room temperature with methylamine as a modifier. Characterized with X-ray powder diffraction (XRD), solid state ¹³C and ²⁹Si magic angle spinning nuclear magnetic resonance (¹³C and ²⁹Si MAS NMR), it has been observed that the obvious change of the framework and the appearance of new Si—N bonds and Si—OH in the framework. The acid-basic properties of the hybrid zeolite, investigated with TG/DTG and NH₃-TPD or CO₂-TPD, have been proved to be obviously enhanced. As pre-calcination at different temperature, the acid amount and basic amount of the modified zeolite increased obviously. It was confirmed that the enhanced acid and base properties mainly came from the structural defects, such as the species of Si—OH and the Si—N on the framework, respectively.

Key words: high silica Y zeolite, hybridation, acid-base bifunctional, methylamine, modification