Effectiveness of nano-scale ZSM-5 zeolite and its deactivation mechanism on catalytic cracking of representative hydrocarbons of naphtha
Effectiveness of nano-scale ZSM-5 zeolite and its deactivation mechanism on catalytic cracking of representative hydrocarbons of naphtha
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DOI：
10.1016/j.micromeso.2013.03.016
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发表时间：
2013-07-15
影响因子：
5.2
通讯作者：
Masuda, Takao
中科院分区：
文献类型：
--
作者：
Konno, Hiroki;Tago, Teruoki;Masuda, Takao
考察了正己烷、环己烷和甲基环己烷等代表性碳氢化合物在ZSM-5沸石分子筛催化剂上的常压催化裂化反应。结果表明，沸石的硅铝比影响产物的选择性和转化率。为了考察ZSM-5分子筛的晶粒度对催化剂寿命的影响，将晶粒度分别为2300 nm和90 nm的ZSM-5(Si/Al=150)分子筛用于具有代表性的石脑油烃的裂解。在环己烷(环己烷和甲基环己烷)裂解反应中，反应一开始就容易生成焦炭，导致大规模ZSM-5催化剂的严重失活。相反，无论反应物的类型如何，纳米ZSM-5都表现出高转化率和高低碳烯烃产率，且活性稳定。结果表明，纳米ZSM-5沸石用于石脑油催化裂化是有效的，得到了产率高、稳定性好的低碳烯烃。(C)2013 Elsevier Inc.保留所有权利。
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.