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Behavior of Cholesterol and Catalysts in Supercritical Water

机译:胆固醇和催化剂在超临界水中的行为

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摘要

Cholesterol reacted over 5 wt % Pt/C, 5 wt % Pd/C, and HZSM-5 in supercritical water at 400 degrees C. The major products with the Pt/C and Pd/C catalysts are cholesterobderived steroids, polynuclear aromatic compounds, aliphatic hydrocarbons, and gases (H-2, CH4, and C2H6), resulting from hydrogenation, dehydrogenation, and cracking reactions. HZSM-5 favored initial dehydration of cholesterol to form cholesta-3,5-diene and then catalyzed further isomerization and cracking reactions. The presence of H-2 had little or no effect, except when the catalyst was absent, in which case added H-2 led to higher cholestadiene yields and lower cholesterol, conversion. Increasing the catalyst loading resulted in higher yields of lower Molecular weight products but also significantly lower carbon recoveries. Characterization of the Pt/C and Pd/C catalysts showed carbon support gasification and particle growth after exposure to supercritical water.
机译:胆固醇在400摄氏度的超临界水中以超过5 wt%的Pt / C,5 wt%的Pd / C和HZSM-5反应。使用Pt / C和Pd / C催化剂的主要产物是胆固醇衍生的类固醇,多核芳族化合物,氢化,脱氢和裂解反应产生的脂肪族烃和气体(H-2,CH4和C2H6)。 HZSM-5有利于胆固醇的初步脱水形成cholesta-3,5-diene,然后催化进一步的异构化和裂解反应。除了不存在催化剂外,H-2的存在几乎没有影响,甚至没有影响,在这种情况下,加入H-2会导致胆甾二烯产率更高,胆固醇转化率更低。催化剂负载量的增加导致较低分子量产物的更高产率,但也显着降低了碳回收率。 Pt / C和Pd / C催化剂的表征显示,碳载体气化和暴露于超临界水后颗粒生长。

著录项

  • 来源
    《Energy & fuels》 |2016年第10期|7937-7946|共10页
  • 作者单位

    Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA;

    Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA|Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-18 00:39:58

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