Abstract:

The objective of the research was to explore the optimum conditions to synthesize materials with graded pores and high hydrothermal stability which are potential candidates for catalysts. The methods of synthesizing Micro/mesoporous zeolites were that CTMABr（cetyltrimethylammonium bromide）was used as the template and Y precursors were obtained by degradation of NaY zeolites. The results of  XRD and FTIR suggested that the composites have an interconnected hierarchical micro  meso porous structure, with the mesoporous remains existing after the treatment at 750?℃ in 100% vapor for 2?h. The conclusion is that the materials synthesized in the optimum conditions with graded pores and high hydrothermal stability， are different from those obtained from the process of direct synthesis of precursors， and also degradation of waste zeolites has the advantages of reclaiming waste zeolites and cutting the cost.

Key words: micro/mesoporous zeolite; degradation; tem plates; selfassembly; precursor