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Selection of highly active and stable Co supported SiC catalyst for Fischer-Tropsch synthesis: Effect of the preparation method

机译：费-托合成中高活性和稳定的钴负载SiC催化剂的选择：制备方法的影响

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摘要

Co3O4 supported on SiC (Co3O4/SiC) composites were prepared by incipient wetness impregnation (IWI), sol-gel (SG) and precipitation (PCT) methods, respectively. Their physicochemical properties were investigated by XRD, low-temperature N-2 adsorption, TEM, XPS, H-2-TPR and H-2-TPD, and the catalytic activity and selectivity of these composites after reduction (Co/SiC) were tested for Fischer-Tropsch synthesis (FTS). The results exhibit that the methane selectivities on all Co/SiC catalysts are lower than 9% and the preparation methods remarkably affect their catalytic performance. Among the three catalysts prepared by different methods, the catalyst obtained by the SG method shows the highest catalytic activity and C5+ selectivity for FTS, and their catalytic activities obey the order of SG IWI PCT. The excellent catalytic performance of Co3O4/SiC (SG) was analyzed and attributed to the appropriate Co3O4 grain size and cobalt-support interaction and the high reducibility and dispersion of Co oxide, which result in the suitable Co grain size and large concentration of surface Co active sites. Furthermore, the Co/SiC catalyst prepared by the SG method presents a highest stability after being used for 110 h when the FTS was conducted at 220 degrees C in a fixed-bed reactor that uses H-2/CO syngas as a feed at 2M ratio and 2 MPa total pressure. This study is of great guiding significance for synthesizing highly active and stable catalysts for FTS.
机译：分别通过初期湿润浸渍法（IWI），溶胶凝胶法（SG）和沉淀法（PCT）制备了负载在SiC（Co3O4 / SiC）复合材料上的Co3O4。通过XRD，低温N-2吸附，TEM，XPS，H-2-TPR和H-2-TPD研究了它们的理化性质，并测试了它们在还原后对Co / SiC的催化活性和选择性。用于费托合成（FTS）。结果表明，所有Co / SiC催化剂的甲烷选择性均低于9％，制备方法对催化剂的催化性能有明显影响。在用不同方法制备的三种催化剂中，用SG法制得的催化剂对FTS表现出最高的催化活性和C5 +选择性，其催化活性遵循SG> IWI> PCT的顺序。分析了Co3O4 / SiC（SG）的优异催化性能，归因于合适的Co3O4粒度和钴-载体相互作用以及Co氧化物的高还原性和分散性，从而导致了合适的Co粒度和高表面Co浓度活动站点。此外，当在220℃，以H-2 / CO合成气为原料，以2M作为进料的固定床反应器中进行FTS时，通过SG方法制备的Co / SiC催化剂在使用110小时后表现出最高的稳定性。比率和2 MPa的总压力。这项研究对于合成高活性和稳定的FTS催化剂具有重要的指导意义。

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  • 来源
    《Fuel》 |2018年第1期|144-150|共7页
  • 作者

    Song Huanqiao; Zhao Qingzhu; Zhou Xing; Cao Ziye; Luo Mingsheng;

  • 作者单位

    Beijing Inst Petrochem Technol, Coll Chem Engn, Beijing 102617, Peoples R China;

    Beijing Inst Petrochem Technol, Coll Chem Engn, Beijing 102617, Peoples R China;

    Beijing Inst Petrochem Technol, Coll Chem Engn, Beijing 102617, Peoples R China;

    Beijing Inst Petrochem Technol, Coll Chem Engn, Beijing 102617, Peoples R China;

    Beijing Inst Petrochem Technol, Coll Chem Engn, Beijing 102617, Peoples R China;

  • 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

    Co/SiC; Fischer-Tropsch synthesis; Catalyst preparation; High activity; High stability;

    机译：Co / SiC;费托合成;催化剂制备;高活性;高稳定性;

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