4.6 Article

Size effect of the CoxMn1-xO precursor for Fischer-Tropsch to olefins over Co2C-based catalysts

Journal

CATALYSIS SCIENCE & TECHNOLOGY
Volume 11, Issue 15, Pages 5232-5241

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cy00893e

Keywords

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Funding

  1. Natural Science Foundation of China [91945301, 22072177]
  2. National Key R&D Program of China [2017YFB0602202]
  3. Program of Shanghai Academic/Technology Research Leader [20XD1404000]
  4. Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [QYZDB-SSW-SLH035]
  5. Transformational Technologies for Clean Energy and Demonstration and Strategic Priority Research Program of CAS [XDA21020600]
  6. Youth Innovation Promotion Association of CAS
  7. Xin Rui Excellent Young Talents Program of SARI [E054881ZZ1]

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By investigating the size effect of CoxMn1-xO precursor, it was found that smaller precursor size promoted the formation of Co2C nanoprisms and facilitated efficient olefin production, offering a practical strategy to enhance catalytic performance for the Fischer-Tropsch to olefins reaction.
The size effect of the CoxMn1-xO precursor on the formation of Co2C nanoprisms and the structure-performance relationship for the Fischer-Tropsch to olefins (FTO) reaction was investigated. CoxMn1-xO precursors with different sizes from 6.5 nm to 16.7 nm were fabricated by calcination at different temperatures. The CoxMn1-xO with small size possessed high concentration of oxygen vacancies, which promoted the dissociation of CO to form active C* species, and more Co2C nanoprisms with small size could be generated. In addition, the catalytic performance also changed with the size of the precursor. The olefin formation rate significantly increased from 3.36 to 12.48 mu mol gCoxMn1-xO-1 h-1 as the CoxMn1-xO size decreased from 16.7 to 6.5 nm. This work clearly elucidates the size effect of the CoxMn1-xO precursor on the structure-performance relationship and may provide a practical and simple strategy to fabricate highly efficient CoMn catalysts for the FTO reaction.

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