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<p>Light olefins, such as ethylene and propylene, are the most widely used chemical monomers in the petrochemical industry; they are currently produced mainly via naphtha steam cracking. Enhancing feed flexibility for olefin production is an important strategy for improving the efficiency of limited resources and increasing feedstock economics. LPG (liquefied petroleum gas) is a relatively underutilized feedstock compared to naphtha because it is mostly used as a fuel to provide heat for the process. We investigated a tandem catalytic dehydrogenation–cracking reaction to convert <i>n</i>-butane into olefins at moderate temperatures, thus increasing its feedstock utilization. The tandem system used two types of catalysts: a Pt-based catalyst for dehydrogenation and ZSM-5 for cracking. This enabled the sequential conversion of butane to butenes and the continuous production of olefins with a lower production of methane. The efficiency of the tandem reaction was maximized by studying the optimal reaction temperature, relative reaction rate, catalyst ratio, and proximity effect of the catalyst layer. At 600&#xa0;°C, light olefin yields of 34–37% were obtained via butane dehydrogenative cracking, which was 5 times higher than that of the thermal cracking (6.8%) and 1.5 times higher than that of butane catalytic cracking (22.5%). In addition, an optimal reactor design and process were proposed while considering the endothermic characteristics of dehydrogenative cracking and the need for periodic catalyst regeneration. This study offers a more efficient and flexible process for converting underutilized LPG into valuable light olefins through tandem catalysis, improving resource utilization, reducing energy consumption, and increasing olefin yields.</p>

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Tandem Catalysis for Dehydrogenative Cracking of n-Butane to Light Olefins with Lower Production of Methane

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Hawon Park,
  • Haeshik Lee,
  • Shokhboz Muxamadqulov,
  • Do Kyoung Kim,
  • Yong Ki Park,
  • Kiwoong Kim,
  • Dae Sung Park

摘要

Light olefins, such as ethylene and propylene, are the most widely used chemical monomers in the petrochemical industry; they are currently produced mainly via naphtha steam cracking. Enhancing feed flexibility for olefin production is an important strategy for improving the efficiency of limited resources and increasing feedstock economics. LPG (liquefied petroleum gas) is a relatively underutilized feedstock compared to naphtha because it is mostly used as a fuel to provide heat for the process. We investigated a tandem catalytic dehydrogenation–cracking reaction to convert n-butane into olefins at moderate temperatures, thus increasing its feedstock utilization. The tandem system used two types of catalysts: a Pt-based catalyst for dehydrogenation and ZSM-5 for cracking. This enabled the sequential conversion of butane to butenes and the continuous production of olefins with a lower production of methane. The efficiency of the tandem reaction was maximized by studying the optimal reaction temperature, relative reaction rate, catalyst ratio, and proximity effect of the catalyst layer. At 600 °C, light olefin yields of 34–37% were obtained via butane dehydrogenative cracking, which was 5 times higher than that of the thermal cracking (6.8%) and 1.5 times higher than that of butane catalytic cracking (22.5%). In addition, an optimal reactor design and process were proposed while considering the endothermic characteristics of dehydrogenative cracking and the need for periodic catalyst regeneration. This study offers a more efficient and flexible process for converting underutilized LPG into valuable light olefins through tandem catalysis, improving resource utilization, reducing energy consumption, and increasing olefin yields.