Harnessing Strong Metal-Support Interaction to Proliferate the Dry Reforming of Methane Performance by In Situ
Ok Sung Jeon1,2, Hyesung Lee1, Kug-Seung Lee3
1Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea.
ACS Applied Materials & Interfaces
|March 3, 2022
Summary
A new mild reduction method using dry methane enhances strong metal-support interaction (SMSI) in nanocatalysts. This improves nickel-cerium oxide catalyst performance for dry reforming of methane (DRM) reactions.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Strong metal-support interaction (SMSI) is crucial for nanocatalyst stability, preventing nanoparticle aggregation and carbon deposition.
- Traditional preparation methods involving heat treatment and harsh reduction conditions can weaken SMSI and deactivate catalysts.
- Enhancing surficial metal-doped sites is key to retaining SMSI and boosting catalytic activity.
Purpose of the Study:
- To develop a mild reduction process to improve SMSI in nickel-cerium oxide nanocatalysts.
- To investigate the impact of mild reduction on the chemical state of Ni-CeO2 catalysts.
- To enhance catalytic activity and stability for the dry reforming of methane (DRM) reaction.
Main Methods:
- A novel mild reduction process using dry methane (CH4/CO2) gas was employed.
- The process was applied to nickel (Ni) and cerium oxide (CeO2) nanocatalysts.
- The chemical state of Ni in the Ni-CeO2 catalyst was analyzed post-reduction.
Main Results:
- The mild reduction process effectively suppressed nanoparticle aggregation.
- It significantly increased the exposed interface between Ni and CeO2, enhancing SMSI.
- A substantial amount of Ni3+ phase was formed at the catalyst surface, indicating enhanced SMSI.
Conclusions:
- Mild reduction using dry methane is an effective method to improve SMSI in Ni-CeO2 nanocatalysts.
- The enhanced SMSI leads to superior catalytic performance in the dry reforming of methane (DRM).
- The catalyst demonstrated a high CH4 conversion rate (~60%) and stable operation for 550 hours at 600 °C.
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