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Received August 12, 2015
Accepted November 6, 2015
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Conversion of methanol into light olefins over ZSM-11 catalyst in a circulating fluidized-bed unit
State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266555, Shandong, China 1Dagang Petrochemical Company, PetroChina Corporation, Tianjin 300280, P. R. China
mengxiaojing88@126.com
Korean Journal of Chemical Engineering, March 2016, 33(3), 831-837(7), 10.1007/s11814-015-0234-4
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Abstract
Methanol conversion and the reaction pathway were investigated in a pilot-scale circulating fluidized-bed (CFB) unit over hierarchical ZSM-11 catalyst. Experimental results indicated that ZSM-11 catalyst was highly resistant to external coke due to the formation of mesopores. Elevated temperatures favored the production of propylene and butylene and decreased the yield of ethylene. Additionally, no direct relations were shown between the formation of ethylene and other products under different pressures, suggesting that ethylene was a primary product produced at the initial of the reaction. Methylation-cracking and oligomerization were verified as the main reaction pathway for the formation of C3 + alkenes., Methylation and oligomerization of olefins were dominated under high methanol partial pressure and consequently responsible for the production of higher olefins, while the b-scission of C7= for propene and butylene, and C8 = for butylene were enhanced at low methanol partial pressure.
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