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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 23, 2001
Accepted July 2, 2001

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 unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Coke Formation on the Surface of α-Al2O3 in the Catalytic Pyrolysis of Naphtha

Sang Mun Jeong Young Chang Byun Jong Hyun Chae Won-Ho Lee^†

Chemical Process & Catalysis Research Institute, LG Chemical Ltd./Research Park, 104-1, Moonji-dong, Yusong-gu, Daejeon 305-380, Korea

whlee@lgchem.co.kr

Korean Journal of Chemical Engineering, November 2001, 18(6), 842-847(6), 10.1007/BF02705606

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Abstract

The catalytic pyrolysis of naphtha has been carried out in a quartz reactor loaded with 5 mm α-Al2O3 spheres, The yields of ethylene and propylene exhibit about 10% and 5% higher values compared to the thermal pyrolysis in the absence of α-Al2O3 spheres at the same reaction conditions. The coke formation on α-Al2O3 spheres increased continuously along with the axial length of the reactor as well as with reaction time. Results suggest that the concentration of the coke precursors in the gas phase may increase along with the axial length of the reactor. Coke filled up completely the internal pore of the sphere near the exit of the reactor after reaction for 4 hr. The coke film on the external surface of the sphere grew continuously thicker. The coke formation was influenced strongly by the physical properties of the α-Al2O3 spheres. Coke deposition was the least on the α-Al2O3 sphere with the lowest surface area and pore volume among the tested α-Al2O3 spheres.

Keywords

Catalytic Pyrolysis Naphtha Coke Olefin Yield Physical Property

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