Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (5): 684-691.DOI: 10.1016/S1872-2067(14)60026-7

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The production of light olefins by catalytic cracking of the microalga Isochrysis zhanjiangensis over a modified ZSM-5 catalyst

Xinglong Donga,b, Song Xuec, Jinling Zhanga, Wei Huanga, Jiannan Zhouc, Zhaoan Chena, Danhua Yuana,b, Yunpeng Xua, Zhongmin Liua   

  1. a National Engineering Laboratory for Methanol to Olefins, National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China;
    c Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2013-11-15 Revised:2014-01-03 Online:2014-04-18 Published:2014-04-24
  • Supported by:

    This work was supported by Knowledge Innovation Programs of the Chinese Academy of Sciences (KGCX2-YW-223), the Hundred Talent Program of the Chinese Academy of Sciences (A1097), the National Basic Research Program of China (973 Program, 2009CB220004, 2011CBA00803), the Knowledge Innovation Programs of the Chinese Academy of Sciences (KSCX2-YW-G-073, KSCX2-YW-373-2), and the Knowledge Innovation Programs of Dalian Institute of Chemical Physics, CAS (K2010A3).

Abstract:

This study investigated the catalytic cracking of the microalga Isochrysis zhanjiangensis over a modified ZSM-5 catalyst with the aim of producing C2-C4 light olefins. Compared with the thermal cracking process, the catalytic cracking of this microalga displayed higher selectivity for and greater yield of these olefins. The catalytic cracking of extracted lipids and the corresponding residues of the microalga was also examined, and the results showed that the lipids could be efficiently converted to light olefins. The catalytic cracking of lipids extracted by different solvents demonstrated that neutral lipids gave the highest yield of light olefins at 36.7%. The yields of light olefins obtained from catalytic cracking of the extraction residues were much lower than the yields obtained from lipids, and thus the lipids, especially the neutral lipids, are the primary contributors to the generation of light olefins. Isochrysis zhanjiangensis with an elevated neutral lipid content will therefore give the highest yield of light olefins through catalytic cracking.

Key words: Microalgae, Isochrysis zhanjiangensis, Catalytic cracking, ZSM-5, Light olefins