...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Deactivation of a hydrotreating catalyst during hydroprocessing of synthetic crude by metal bearing compounds
【24h】

Deactivation of a hydrotreating catalyst during hydroprocessing of synthetic crude by metal bearing compounds

机译：含金属化合物对合成原油加氢处理过程中加氢处理催化剂的失活

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The objective of this study is to investigate the deactivation of CoMo/gamma-Al2O3 catalyst by the metals present in the heavy oils. For this, a synthetic feed is prepared in which coke precursors are minimized. Therefore, de-waxing of a heavy crude is performed which contains very less amount of microcarbon residue (MCR) and asphaltene. A spent catalyst was generated from the hydrotreating of dewaxed oil in a microflow continuous reactor (MFU). The activities of spent (from MFU unit) and regenerated catalysts were compared with the fresh catalyst using the same dewaxed oil in a batch reactor. Detailed characterisations of fresh, spent, and regenerated catalysts were performed using thermogravimetric analysis (TGA), N-2-sorption isotherms, Raman spectroscopy, scanning electron microscopy (SEM), and high resolution-transmission electron microscopy (HR-TEM). Hydrocracking and hydrotreating activities of the catalysts were evaluated with contact time. It has been found that the hydrodesulfurization (HDS) activity of the regenerated catalyst was even lower than that of spent catalyst. This confirmed that the deactivation occurs by metals from the feed. HR-TEM results indicates that low HDS activity of the regenerated catalyst was observed may be due to the phase change from type II to type I Co-Mo-S during the high-temperature regeneration process. Also, the HDS activity of the spent catalysts showed that Ni deposited from the feed perform the autocatalysis function. The higher hydrocracking activity of the regenerated catalyst suggests that bare alumina-support takes part in the cracking activity, particularly at a higher reaction temperature. The amount of MCR and n-heptane analyzed during the reaction at different contact times concluded that sediments are formed during the early stage of the reaction. As the reaction precedes these sediments agglomerated and separated out from the liquid hydrocarbons.
机译：这项研究的目的是研究重油中存在的金属使CoMo /γ-Al2O3催化剂失活。为此，制备了其中焦炭前体最小化的合成进料。因此，进行了重质原油的脱蜡，该重质蜡包含非常少的微碳残余物（MCR）和沥青质。在微流连续反应器（MFU）中对脱蜡油进行加氢处理产生了废催化剂。在间歇反应器中使用相同的脱蜡油，将废催化剂（来自MFU装置）和再生催化剂的活性与新鲜催化剂进行比较。使用热重分析（TGA），N-2-吸附等温线，拉曼光谱，扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HR-TEM）对新鲜，废弃和再生的催化剂进行了详细的表征。通过接触时间评估催化剂的加氢裂化和加氢处理活性。已经发现，再生催化剂的加氢脱硫（HDS）活性甚至低于废催化剂。这证实了失活是由进料中的金属引起的。 HR-TEM结果表明，观察到再生催化剂的HDS活性较低，可能是由于高温再生过程中从II型到I型Co-Mo-S的相变。另外，废催化剂的HDS活性表明，从进料中沉积的Ni具有自动催化功能。再生催化剂的较高的加氢裂化活性表明裸氧化铝载体参与了裂化活性，特别是在较高的反应温度下。在不同接触时间的反应过程中分析的MCR和正庚烷的含量得出结论，认为在反应的早期就形成了沉积物。随着反应的进行，这些沉积物会聚结并从液态烃中分离出来。

著录项

  • 来源
    《Fuel》 |2019年第1期|579-589|共11页
  • 作者

    Kohli K.; Prajapati R.; Maity Samir K.; Sau M.; Sharma Brajendra K.;

  • 作者单位

    Univ Illinois, Illinois Sustainable Technol Ctr, Prairie Res Inst, Urbana, IL 61801 USA|CSIR Indian Inst Petr, Convers & Catalysis Div, Dehra Dun 248005, Uttar Pradesh, India;

    CSIR Indian Inst Petr, Convers & Catalysis Div, Dehra Dun 248005, Uttar Pradesh, India;

    CSIR Indian Inst Petr, Convers & Catalysis Div, Dehra Dun 248005, Uttar Pradesh, India;

    Res & Dev Ctr Indian Oil Corp, Refining Technol 2, Faridabad, India;

    Univ Illinois, Illinois Sustainable Technol Ctr, Prairie Res Inst, Urbana, IL 61801 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dewaxed oil; Resins; CoMo/Al2O3; Catalyst deactivation; Spent catalyst; Regenerated catalyst; Type-I and type-II CoMoS phases;

    机译：脱蜡油;树脂;CoMo / Al2O3;催化剂失活;废催化剂;再生催化剂;I型和II型CoMoS相;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号