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<p>To achieve a higher light olefin yield for the catalytic cracking of kerosene and diesel, the effect of the Si/Al<sub>2</sub> ratio (SAR) of zeolite beta (BEA) in steam catalytic cracking (SCC) and direct catalytic cracking (DCC) of <i>n-</i>dodecane (<i>n-</i>C12) was investigated in a fixed bed reaction system over zeolite beta with SAR in a range of 25–360. The catalysts were characterized by XRD, NH<sub>3</sub>-TPD, pyridine FT-IR, N<sub>2</sub>-sorption, SEM, and TGA. In both DCC and SCC, <i>n-</i>C12 conversion showed a tendency to decrease linearly as the BA (Brønsted acidity) of the zeolite beta catalyst increased. Both the light olefin yield and the light olefin/paraffin ratio in SCC were higher than that in DCC, where the steam in SCC acts as a diluent, thereby decreasing the partial pressure of the reactants and reducing the formation of paraffins. Through optimization of the operation variables, light olefin yield exceeding 74.3&#xa0;wt% was obtained in SCC using high silica zeolite beta catalysts with SAR = 300 at TOS = 1&#xa0;h, 650&#xa0;°C, and 4.2&#xa0;h<sup>−1</sup>.</p>

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Effect of Si/Al2 Ratio Over Zeolite Beta in Steam and Direct Catalytic Cracking of n-dodecane

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月7日

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  • Arumugam Ramesh,
  • Jun-Hyuk Ahn,
  • Su-Un Lee,
  • Kwang-Eun Jeong,
  • Temur Khujamuratov,
  • Tae-Wan Kim,
  • Chul-Ung Kim

摘要

To achieve a higher light olefin yield for the catalytic cracking of kerosene and diesel, the effect of the Si/Al2 ratio (SAR) of zeolite beta (BEA) in steam catalytic cracking (SCC) and direct catalytic cracking (DCC) of n-dodecane (n-C12) was investigated in a fixed bed reaction system over zeolite beta with SAR in a range of 25–360. The catalysts were characterized by XRD, NH3-TPD, pyridine FT-IR, N2-sorption, SEM, and TGA. In both DCC and SCC, n-C12 conversion showed a tendency to decrease linearly as the BA (Brønsted acidity) of the zeolite beta catalyst increased. Both the light olefin yield and the light olefin/paraffin ratio in SCC were higher than that in DCC, where the steam in SCC acts as a diluent, thereby decreasing the partial pressure of the reactants and reducing the formation of paraffins. Through optimization of the operation variables, light olefin yield exceeding 74.3 wt% was obtained in SCC using high silica zeolite beta catalysts with SAR = 300 at TOS = 1 h, 650 °C, and 4.2 h−1.