Tuning Metal–Support Interactions on Ni/Al2O3 Catalysts to Improve Catalytic Activity and Stability for Dry Reforming of Methane

Processes

Lulu He¹  Bin Yue¹  Yuanhang Ren¹  Heyong He¹  ShikChi Edman Tsang² 

[1] Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China;Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, UK;

关键词: carbon dioxide;    methane;    calcination temperature;    dry reforming;    nickel particles;   

DOI  :  10.3390/pr9040706

来源: DOAJ

【 摘 要 】

Ni-based catalysts supported on alumina derived from the pseudo-boehmite prepared by the impregnation method were employed for catalytic dry reforming of methane reaction at the temperature of 550–750 °C. The effect of calcination temperature on physicochemical properties such as the Ni dispersion, reduction degree, nickel crystallite sizes, and metal–support interaction of the catalysts was investigated. The characterization results show that increasing the catalyst calcination temperature leads to the formation of nickel-alumina spinel, which enhances the metal–support interaction and increases the reduction temperature. The nickel nanoparticle size decreases and the effective dispersion increases with the increasing calcination temperature from 450 °C to 750 °C due to the formation of nickel aluminate. The catalyst calcined at 750 °C exhibits the highest CH₄ and CO₂ conversion owing to the small Ni⁰ active sites and high Ni dispersion. In a 200 h stability test in dry reforming of methane at 700 °C, the Ni/Al₂O₃-750 catalyst exhibits excellent catalytic stability and anti-coking ability.

【 授权许可】

Unknown