Higher alcohol synthesis from syngas over xerogel-derived Co-Cu-Al2O3 catalyst with an enhanced metal proximity

To improve metal proximity of Co-Cu-Al2O3 catalyst, xerogel-derived mesoporous Co-Cu-Al2O3 catalysts with various Co:Cu molar ratios were prepared by an epoxide-driven sol-gel method and applied to higher alcohol synthesis from syngas

Seung Ju Han

2019

Scholarcy highlights

  • To improve metal proximity of Co-Cu-Al2O3 catalyst, xerogel-derived mesoporous Co-Cu-Al2O3 catalysts with various Co:Cu molar ratios were prepared by an epoxide-driven sol-gel method and applied to higher alcohol synthesis from syngas
  • The CoCuAl-Xe catalyst induced the formation of a composite spinel structure containing Co, Cu, and Al
  • In higher alcohol synthesis from syngas, all the catalysts showed the linear quasi-Anderson Schulz Flory plot of carbon-containing products, which was attributed to the CO insertion mechanism in higher alcohol synthesis
  • The Co-rich CoCuAl-Xe catalyst was disadvantageous in terms of alcohol selectivity because of a lack of CO insertion sites, and the Cu-rich one was disadvantageous in CO dissociation and led to methanol formation
  • The computational study suggests that high Co-Cu proximity favors CHOH* mechanism for CH* formation and promotes CO insertion reaction
  • It was found that the optimal Co/Cu ratio and high Co-Cu proximity is required for high catalytic activity in higher alcohol synthesis

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