Scholarlink

<p>The promotional effects of Cu on precipitated Fe–K–SiO<sub>2</sub> catalysts were systematically investigated using a series of Cu-free (0Cu) and Cu-promoted catalysts (1Cu, 3Cu, 5Cu, and 7Cu). Comparative studies of the 0Cu and 5Cu catalysts under both fixed and variable activation times provided direct evidence that Cu promotion shortens the induction period and enhances steady-state CO conversion. This effect is attributed to facilitated formation of the active iron carbide phase (χ-Fe<sub>5</sub>C<sub>2</sub>) via hydrogen spillover on the copper surface. When product selectivities were compared at similar CO conversion levels, only marginal differences were observed between the two catalysts. Extending the analysis to the whole catalyst series under sufficiently activated conditions revealed that CO conversion increased with Cu loading, reaching a maximum of 90.8% at 5Cu before decreasing at higher Cu contents. Increasing Cu loading also slightly reduced the olefin-to-paraffin ratio and heavy hydrocarbon selectivity, though the changes were not substantial. Overall, these findings demonstrate that optimal Cu promotion (5Cu in this study) is crucial for minimizing induction periods without significantly affecting product selectivity.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Promotional Effects of Cu on Precipitated Fe–K–SiO2 Catalysts: Activation Behavior and Catalytic Performance in the Fischer–Tropsch Synthesis

  • 期刊论文

  • 发表日期：

    2025年11月19日

查看全文
  • Gyoung Woo Lee,
  • Geun Bae Rhim,
  • Kwang Young Kim,
  • Young Eun Kim,
  • Yeon Hee Ro,
  • Hyeon Song Lee,
  • Yejin Lee,
  • Min Hye Youn,
  • Kwan-Young Lee,
  • Dong Hyun Chun

摘要

The promotional effects of Cu on precipitated Fe–K–SiO2 catalysts were systematically investigated using a series of Cu-free (0Cu) and Cu-promoted catalysts (1Cu, 3Cu, 5Cu, and 7Cu). Comparative studies of the 0Cu and 5Cu catalysts under both fixed and variable activation times provided direct evidence that Cu promotion shortens the induction period and enhances steady-state CO conversion. This effect is attributed to facilitated formation of the active iron carbide phase (χ-Fe5C2) via hydrogen spillover on the copper surface. When product selectivities were compared at similar CO conversion levels, only marginal differences were observed between the two catalysts. Extending the analysis to the whole catalyst series under sufficiently activated conditions revealed that CO conversion increased with Cu loading, reaching a maximum of 90.8% at 5Cu before decreasing at higher Cu contents. Increasing Cu loading also slightly reduced the olefin-to-paraffin ratio and heavy hydrocarbon selectivity, though the changes were not substantial. Overall, these findings demonstrate that optimal Cu promotion (5Cu in this study) is crucial for minimizing induction periods without significantly affecting product selectivity.