...
首页> 外文期刊>Catalysis science & technology >The intrinsic effects of shell thickness on the Fischer-Tropsch synthesis over core-shell structured catalysts
【24h】

The intrinsic effects of shell thickness on the Fischer-Tropsch synthesis over core-shell structured catalysts

机译:壳厚度对芯壳结构催化剂的Fischer-Tropsch合成的内在影响

获取原文
获取原文并翻译 | 示例
           

摘要

A series of core-shell catalysts with cobalt nanoparticles coated by silica shells were prepared to provide an insight into the effects of the shell thickness on the Fischer-Tropsch synthesis. The catalysts displayed uniform silica shell thicknesses in the range of 4.3-18.2 nm as ascertained by TEM. From the H2 chemisorption results, increasing the shell thickness did not reduce the number of active sites due to the similar active cobalt surface areas. Even though the reducibility determined by H2-TPR decreased rapidly with the increase in shell thickness, the catalytic activity was not evidently reduced. The hydrocarbon products shifted to shorter chains and the C_(15)-C_(18) selectivity had a volcano-type dependence as the shell thickness increased, which is probably because thicker shells contribute to more severe diffusion limitations of the reactants.
机译:准备一系列带有二氧化硅壳覆盖的钴纳米颗粒的核壳催化剂,以提供对壳厚度对Fischer-Tropsch合成的影响的见解。 如TEM确定的,催化剂显示在4.3-18.2 nm的范围内均匀的二氧化硅壳厚度。 从H2的化学吸收结果中,增加壳厚度并不能减少由于相似的活性钴表面积而导致的活性位点的数量。 即使由H2-TPR确定的可降低性随着壳厚度的增加而迅速降低,但显然不会降低催化活性。 碳氢化合物产物转移到较短的链条,C_(15)-C_(18)选择性随着壳厚度的增加而具有火山型依赖性,这可能是因为较厚的壳会导致反应物的更严重的扩散限制。

著录项

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