PREPARATION OF HIERARCHICAL POROUS ZSM-5 ZEOLITE AND ITS CATALYTIC CRACKING PERFORMANCE

Abstract

Abstract:

Hierarchical porous ZSM-5 zolites were prepared by direct synthesis and post modification and characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption and temperture-programmed desorption of ammonia (NH3-TPD), respectively. The catalytic cracking performance of the samples was evaluated in a micro fixed-bed reactor. The results indicate that compared with conventional ZSM-5, the hierarchical porous ZSM-5 zeolites have the advantages in higher surface area, mesoporous volume and ratio of meso/micro. The propylene yield is increased because the mesopores are introduced in the modified sieve, which make the product more easily to diffuse and th effectively suppress the hydrogen transfer reaction. Over the nanolayered NZSM-5-300 with the highest ratio of meso/micro, the selectivity of ethylene and reaches 15.8% and 40.1%,respectively. The test results indicate that with increase of meso/micro ratio, the sample exhibits better stability and lower deactivation rate as well as longer.

Key words: hierarchical porous zeolite, ZSM-5, meso/micro ratio, catalytic cracking, propylene selectivity

References

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