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Fischer-Tropsch diesel production over calcium-promoted Co/alumina catalyst: Effect of reaction conditions

机译：钙促进Co /氧化铝催化剂上的费托柴油生产：反应条件的影响

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摘要

The effects of reaction conditions on the Fischer-Tropsch activity and product distribution of an alkali-earth metal promoted cobalt based catalyst were studied. The influence of the promoter on the reducibil-ity and cobalt particle size was studied by different techniques, including N_2 adsorption. X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption and acid-base titrations. Experiments were carried out on a bench-scale fixed bed reactor and catalysts were prepared by incipient wetness impregnation. It was observed that addition of a small amount of calcium oxide as a promoter (0.6 wt.%) improved the cobalt oxide reducibility and reduced the formation of cobalt-aluminate species. A positive correlation between basicity and particle size was observed. In terms of FTS results, CO conversion and C_5~+ selectivity were found to be enhanced by the addition of this promoter. It was important to note that the addition of calcium shifted the distribution to mainly C_(16)-_(18) hydrocarbons fraction, which could be greatly considered for a diesel formulation. Furthermore, the variation of the reaction conditions seemed to influence product distribution in a lesser extent than unpromoted catalyst. Also, a displacement of hydrocarbon distribution to higher molecular weight with decreasing space velocity and temperature was observed. Moreover, the addition of calcium to the cobalt based catalyst was found to greatly maintain selectivity to C_5~+ for a wide range of H_2/CO molar ratios.
机译：研究了反应条件对碱土金属助钴基催化剂费-托活性和产物分布的影响。通过包括N_2吸附在内的各种技术研究了促进剂对还原性和钴粒度的影响。 X射线衍射，程序升温还原，程序升温脱附和酸碱滴定。在台式规模的固定床反应器上进行实验，并通过初期湿润浸渍制备催化剂。观察到添加少量的氧化钙作为促进剂（0.6重量％）改善了氧化钴的还原性并减少了铝酸钴物质的形成。观察到碱度和粒度之间呈正相关。就FTS结果而言，发现通过添加该启动子可以提高CO转化率和C_5〜+选择性。重要的是要注意，钙的添加将分布转移到主要是C_（16）-_（18）碳氢化合物馏分，这对于柴油配方来说可能是非常重要的。此外，反应条件的变化似乎对产物分布的影响程度小于未助催化剂的程度。而且，观察到随着空间速度和温度的降低，烃分布向较高分子量的位移。此外，发现向钴基催化剂中添加钙可在很大的H_2 / CO摩尔比范围内极大地保持对C_5〜+的选择性。

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  • 来源
    《Fuel》 |2011年第5期|p.1935-1945|共11页
  • 作者

    A.R. de la Osa; A. De Lucas; A. Romero; J.L Valverde; P. Sanchez;

  • 作者单位

    Chemical Engineering Department, Faculty of Chemistry, University of Castillo-La Mancha, Avda., Camilo jose Cela 12, 13071 Ciudad Real, Spain;

    Chemical Engineering Department, Faculty of Chemistry, University of Castillo-La Mancha, Avda., Camilo jose Cela 12, 13071 Ciudad Real, Spain;

    Chemical Engineering Department, Faculty of Chemistry, University of Castillo-La Mancha, Avda., Camilo jose Cela 12, 13071 Ciudad Real, Spain;

    Chemical Engineering Department, Faculty of Chemistry, University of Castillo-La Mancha, Avda., Camilo jose Cela 12, 13071 Ciudad Real, Spain;

    Chemical Engineering Department, Faculty of Chemistry, University of Castillo-La Mancha, Avda., Camilo jose Cela 12, 13071 Ciudad Real, Spain;

  • 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

    fischer-tropsch synthesis; reaction conditions; calcium; cobalt catalyst;

    机译：费-托合成;反应条件;钙;钴催化剂;

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