Catalysis Today, Available online 29 October 2013, In Press, Corrected
Proof
Inter-conversion of light olefins on ZSM-5 in
catalytic naphtha cracking condition
Dan Liu (a),
(b), Won Choon Choi (a), Na Young Kang (a), You Jin Lee (a), Hun Soo
Park (c), Chae-Ho Shin (d), Yong-Ki Park (a)
a Green Chemistry Division, Korea Research Institute of Chemical Technology,
Daejeon 305-343, Republic of Korea
b School of Environmental and Chemical Engineering, Tianjin Polytechnic
University, Tianjin 300387, PR China
c Heesung Catalyst Corp., Chung-ku, Seoul, Republic of Korea
d Department of Chemical Engineering, Chungbuk National University, Chungbuk
361-763, Republic of Korea
Abstract
Researchers explored the inter-conversion of
light olefins over four types of HZSM-5 based catalysts under cracking
conditions. They observed similar behaviors of light olefin inter-conversion, regardless
the types of catalyst, depending only on conversion of light olefins.
Conversion and selectivity were not influenced
by the presence of hydrogen. This would indicate that light paraffins were
mainly produced from hydrogen transfer during cracking, rather than
hydrogenation of light olefins. If so, then the inter-conversion of light
olefins occurs through oligomerization of light olefins, followed by
re-cracking of the oligomerized products. Consequently, it is necessary to
suppress oligomerization of light olefins during catalytic cracking to
guarantee high light olefin yield in catalytic naphtha cracking.
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