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Synthesis of ZSM-5 by rapid crystallization method for FCC olefins maximization.

机译：通过快速结晶法合成ZSM-5，以最大化FCC烯烃。

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摘要

This research aimed to study the effect of changing ZSM-5 Si/Al ratios on maximizing Fluid Catalytic Cracking (FCC) light olefins. ZSM-5 additives with Si/Al ratios of: 20,140,220, and 370, and with different metallosilicates Si/Fe ratios: 47 and 165, and Si/Ni ratios: 46 and 102 were prepared. ZSM-5 zeolite prepared by rapid crystallization method (RCM) yields small uniform sized crystals to provide better selectivity of light olefins via FCC mainly propylene which is in high demand world wide. All prepared samples were characterized by X-ray diffraction, scanning electron microscopy, and sorption analyzer. The effects of varying Si/Al ratio and the concentration of the additives in the FCC catalyst on the activity and selectivity were assessed in a micro-activity test (MAT) unit. It was found that by increasing Si/Al ratio, the yield of propylene was increased in the range studied in this thesis. This was attributed to the lower acidity of ZSM-5 additives with high Si/Al ratio. An increase of 0.9 wt % in the propylene yield was obtained at highest Si/Al ratio studied. The increase of propylene yield did not affect gasoline yield substantially. In the case of metallosilicates, higher propylene was formed by high Si/Ni ratio by about 1.33 wt % compared with Si/Fe sample. This showed higher activity of Nickel silicate over Iron silicate prepared in this study.
机译：这项研究旨在研究改变ZSM-5 Si / Al比对最大化流化催化裂化（FCC）轻质烯烃的影响。制备了Z / Al比例为20,140,​​220和370，金属硅酸盐不同的Z / Fe添加剂，Si / Fe比为47和165，Si / Ni比为46和102。通过快速结晶法（RCM）制备的ZSM-5沸石可产生小的均一尺寸的晶体，从而通过FCC（主要是丙烯）在世界范围内广受欢迎，从而提供更好的轻烯烃选择性。所有制备的样品均通过X射线衍射，扫描电子显微镜和吸附分析仪进行表征。在微活性试验（MAT）单元中评估了变化的Si / Al比和FCC催化剂中添加剂浓度对活性和选择性的影响。发现通过增加Si / Al比，丙烯收率在本文研究的范围内增加。这归因于具有高Si ​​/ Al比的ZSM-5添加剂的较低酸度。在所研究的最高Si / Al比下，丙烯产率提高了0.9重量％。丙烯收率的增加基本上不影响汽油收率。在金属硅酸盐的情况下，与Si / Fe样品相比，通过高Si / Ni比约1.33wt％形成更高的丙烯。这表明本研究中制备的硅酸镍比硅酸铁具有更高的活性。

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  • 作者

    Al-Gahtani, Hadi Naser.;

  • 作者单位

    King Fahd University of Petroleum and Minerals (Saudi Arabia).;

  • 授予单位 King Fahd University of Petroleum and Minerals (Saudi Arabia).;
  • 学科 Engineering Chemical.
  • 学位 M.S.
  • 年度 2006
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化工过程（物理过程及物理化学过程）;
  • 关键词

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