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21. Enhancement of CO2 activation and coke-resistant ability on Ni/CeO2 catalyst with La doping for dry reforming of methane.

Author

Xu, Yamei, Qiao, Jinshuo, Sun, Wang, Wang, Zhenhua, and Sun, Kening

Subjects
*CERIUM oxides, *SIZE reduction of materials, *CARBON dioxide, *ACTIVATION energy, *CATALYSTS
Abstract

In the dry reforming of methane (DRM), the oxygen vacancies on the surface of Ni/CeO 2 catalyst play an important role in CO 2 activation, catalytic performance and coke resistance. Herein, Ni/CeO 2 catalysts doped with different amounts of La were investigated to reveal the relationship between oxygen vacancies and catalytic behavior. The addition of La leads to the reduction in size of Ni particles and stronger metal-support interaction (SMSI). Furthermore, the highest proportion of oxygen vacancies is found in 10 wt% La doped Ni/CeO 2 catalyst, which is beneficial for CO 2 activation and CH 4 dissociation. The Ni/CeLa10 catalyst shows stable methane conversion during 100 h of stability test, which is maintained at 80% without obvious decrease at 750 °C. Therefore, the catalysts with more oxygen species display outstanding activity for the DRM and assisted ability in carbon resistance. This work aims to provide a molecular understanding of the modification of DRM's inherent surface sites. • A suitable amount of La addition is crucial for the modification of CeO 2 support. • Both the oxygen vacancy and basic support are responsible for CO 2 activation. • The highly Ni dispersion and moderate SMSI decrease CH 4 activation energy over Ni/CeLa10. • The Ni/CeLa10 catalyst shows the lowest carbon deposition during the 100 h of stability test. [ABSTRACT FROM AUTHOR]

Published
2024
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