Effect of process variables on product yield distribution in thermal catalytic cracking of naphtha to light olefins over Fe/HZSM-5 |
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Authors: | Mina Alyani Jafar Towfighi Seyed Mojtaba Sadrameli |
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Affiliation: | (1) Applied Catalysis Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 110, Dalian, 116023, P.R. China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, P.R. China; |
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Abstract: | The effect of temperature, WHSV and Fe loading over HZSM-5 catalyst in thermal-catalytic cracking (TCC) of naphtha for the production of light olefins has been studied. The response surface defined by three most significant parameters is obtained from Box-Behnken design method and the optimal parameter set is found. The results show that ethylene increases with temperature, while propylene shows an optimum at 650 °C. Moderate WHSV is favorable for maximum production of light olefins. Addition of Fe to HZSM-5 has a favorable effect on the production of light olefins up to 6% of loading. Excess amount of loading decreases the conversion of naphtha, which leads to a drop in light olefin yields. The yield of light olefins (ethylene and propylene) at 670 °C, 44 hr−1 and 6 wt% Fe has been increased to 5.43 wt% compared to the unmodified HZSM-5 and reaches to 42.47 wt%. |
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