WASET
    Jianwen Li and  Hongfang Ma and  Haitao Zhang and  Qiwen Sun and  Weiyong Ying,  Catalytic Cracking of Butene to Propylene over Modified HZSM-5 Zeolites.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
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    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/9998777.