Sequential growth reveals multi-spinel interface promotion for methane combustion over alumina supported palladium catalyst

作者：Zou, Xuelin; Chen, Junfei; Rui, Zebao; Ji, Hongbing

来源：Applied Catalysis B: Environmental , 2020, 273: 119071.

DOI：10.1016/j.apcatb.2020.119071

• Methane oxidation
• PdO
• Spinel interface
• NiCo2O4
• NiAl2O4

Tailoring of active components/metal oxides interface is an effective strategy to improve the performance of supported noble metal catalysts. However, the trade-off between activity and stability accompanies with the modification process. Herein, we propose a facile multi-spinel interface promotion way for simultaneous improvement in activity and stability of Pd/Al2O3 for methane oxidation. Multi-spinel NiCo2O4/NiAl2O4 interface is introduced over gamma-Al2O3 support through sequential growth, and then acts as a structural template for the growth and dispersion of PdO nanoparticles to obtain Pd/NiCo2O4/NiAl2O4/Al2O3. The reducible property of NiCo2O4, and structural matching between NiCo2O4/NiAl2O4 and PdO lead to the enhanced performance during catalytic methane oxidation with respect to a low CH4 activation energy, high turnover frequency value and Pd utilization efficiency as well as long-term stability. Such a multi-spinel interface promotion strategy provides a new way to design efficient supported noble metal catalysts.

• 单位
  东莞理工学院; 茂名学院; 中山大学