open access

https://hdl.handle.net/2115/53117

Effectiveness of nano-scale ZSM-5 zeolite and its deactivation mechanism on catalytic cracking of representative hydrocarbons of naphtha

英語

ZSM-5

2013-07-15

Elsevier Science Bv

Microporous And Mesoporous Materials

175

25-33

The catalytic cracking of representative hydrocarbons of naphtha (n-hexane, cyclohexane, and methyl-cyclohexane) over ZSM-5 zeolite catalysts was examined at reaction temperatures ranging from 823 K to 923 K under atmospheric pressure. It was found that the Si/Al ratio of the zeolite affected the product selectivity and conversion. In order to investigate the effects of the crystal size of the ZSM-5 zeolites on catalyst lifetime, macro- and nano-scale ZSM-5 (Si/Al = 150) with crystal sizes of 2300 nm and 90 nm, respectively, were used for the cracking of representative naphtha hydrocarbons. In the cracking of naphthenes (cyclohexane and methyl-cyclohexane), coke was readily formed from the beginning of the reaction leading to significant deactivation of the catalyst for the macro-scale ZSM-5. In contrast, the nano-scale ZSM-5 exhibited a high conversion and high light olefins yield with stable activity, regardless of the type of reactant. As a result, the application of nano-scale ZSM-5 zeolites to the catalytic cracking of naphtha was effective and gave light olefins with high yield and excellent stable activity. (C) 2013 Elsevier Inc. All rights reserved.

学術雑誌論文

Accepted Manuscript

1387-1811

AA11160707