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Optimization of a single reactor process for the selective conversion of coal to liquid fuels.

机译：优化了将煤选择性转化为液体燃料的单反应器工艺。

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摘要

The conversion of synthesis gas to desirable liquid fuels in gasoline and diesel range in a single reactor process with simultaneous use of FT and cracking catalysts was investigated in this dissertation. Co-based catalyst and ZSM-5 were used as a FT and cracking catalysts, respectively. The structural and textural properties of ZSM-5 were analyzed by XRD, BET and particle size analysis. Following, commercially available FT and cracking catalyst were tested in the newly designed fixed bed dual-zone reactor under 350 psi; syngas with H2/CO ratio in the amount of 2, and flow rate of 70, 100 and 130 smL/min; and 0.5, 1.25 and 2.5 g of ZSM-5. The temperature for the FT Co-based catalyst was maintained constant at 190 °C, whereas, the temperature for the additionally implemented cracking catalyst was varied (250, 300 and 350 °C). The effect of operating reaction conditions such as syngas flow rate, Si/Al molar ratio; temperature and loading of cracking catalyst were investigated. It was shown, that in general, decrease of syngas flow rate, ipso facto increase in residence time, resulted in decrease of gasoline and diesel fuel production, whereas reduction of ZSM-5 loading improved the formation of C5 - C17 paraffins. An enhancement in gasoline and diesel paraffin range formation was also observed with the decrease of cracking temperature. In addition, the effect of variation in operating conditions was evaluated for liquid paraffin production and dominance of chain propagation reactions over cracking and/or isomerizarion reactions with cracking catalyst loading and syngas flow rate was observed. As a consequence, the results employing ZSM-5 showed increased formation of light hydrocarbons and aromatics; and reduction of heavier paraffins production.;Finally, the effect of various Si/Al molar ratios in the amount of 50, 80 and 280 were studied in this research. It was found, that the decrease in acidity of ZSM-5 zeolite enhanced the selectivity towards desirable products as well as heavier paraffins, but suppressed the formation of CH4. Furthermore, the isomerization reactions became favored in expense of cracking reactions.
机译：本文研究了在同时使用FT和裂化催化剂的单反应器工艺中将合成气转化为汽油和柴油范围内所需的液体燃料的方法。 Co基催化剂和ZSM-5分别用作FT和裂化催化剂。通过XRD，BET和粒度分析对ZSM-5的结构和织构特性进行了分析。随后，在新设计的固定床双区反应器中在350 psi下测试了市售的FT和裂化催化剂。 H2 / CO比为2，流速为70、100和130 smL / min的合成气;和0.5、1.25和2.5克ZSM-5。 FT Co基催化剂的温度保持恒定在190°C，而另外实施的裂化催化剂的温度则变化（250、300和350°C）。操作反应条件的影响，例如合成气流速，Si / Al摩尔比；研究了裂化催化剂的温度和负载量。结果表明，一般而言，合成气流速的降低，停留时间的增加（事实上）会导致汽油和柴油燃料产量的降低，而ZSM-5含量的降低会改善C5-C17石蜡的形成。随着裂解温度的降低，还观察到汽油和柴油石蜡范围形成的增加。此外，评估了操作条件变化对液体石蜡生产的影响，并观察到链裂反应和裂化催化剂负载和合成气流速对裂化和/或异构化反应的链增长反应占主导地位。结果，使用ZSM-5的结果表明，轻烃和芳烃的形成增加了。最后，研究了各种Si / Al摩尔比分别为50、80和280的影响。发现，ZSM-5沸石的酸度降低增强了对所需产物以及较重石蜡的选择性，但抑制了CH 4的形成。此外，异构化反应以裂化反应为代价而变得有利。

著录项

  • 作者

    Corsaro, Agnieszka.;

  • 作者单位

    Southern Illinois University at Carbondale.;

  • 授予单位 Southern Illinois University at Carbondale.;
  • 学科 Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 172 p.
  • 总页数 172
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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