Y zeolite crystals is liable to be depolymerized because of the attack of alkali species on its frameworks,which even causes the framework collapse. During the synthesis of the zeolite-zeolite composite composed of FAU and MFI, the dissolution of Y zeolite crystals will change the composition of gel precursors yielding MFI zeolite phase. In present work, Y zeolite crystals, which was mixed with the gel precursors of ZSM-5, were modified with carbon membrane yielded from glucose by hydrothermally treatment a...