Abstract
A series of ZSM-5 zeolite has been synthesized with ultrasonic energy and their catalytic activity has been investigated in catalytic cracking of light naphtha. ZSM-5 zeolites have been synthesized from rice husk ash without using the organic template. Effect of ultrasound power (100, 200 and 300W) on physichochemical properties of synthesized zeolite was investigated. It was found that with varying of the ultrasound irradiation power, the physico-chemical properties of prepared ZSM-5 changed significantly. The XRD analysis showed that the applying ultrasound energy led to decrease the crystal size and crystalinity of ZSM-5. The FESEM analysis showed that the morphology of synthesized ZSM-5 changed from micro-scale hexagonal-shaped to much smaller rough spheres. Furthermore, the external surface area and meso pore volume of ZSM-5 depend on the ultrasound power. Results of catalytic activity test showed that the ultrasound power has great influence on the activity of ZSM-5 and the sample which synthesized with ultrasound power of 200W showed the highest catalytic activity. TGA-DTG analysis of spent catalyst showed that the amount of coke deposited on the samples is depended on the acidity of catalysts. Furthermore, synthesized catalyst with ultrasound power of 200W showed the highest structure stability after 12hr catalytic test.
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