Ni nanoparticles supported on Al2O3 + La2O3 yolk-shell catalyst for photo-assisted thermal decomposition of methane

• Published in: Journal of colloid and interface science Vol. 643; pp. 151 - 161
• Main Authors: Bian, Hui, Gani, Terry Z.H., Liu, Jiaolong, Hondo, Emmerson, Lim, Kang Hui, Zhang, Tianxi, Li, Deng, Liu, Shengzhong Frank, Yan, Junqing, Kawi, Sibudjing
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-08-2023
• Subjects: Alumina; Methane decomposition; Ni nanoparticles; Photo-assisted thermal catalysis; Yolk-shell; Ni nanoparticles; Photo-assisted thermal catalysis; Yolk-shell; Alumina; Methane decomposition
• DOI: 10.1016/j.jcis.2023.04.016
• EISSN: 1095-7103
• ISSN: 0021-9797

In this work, we reported our success in regulating dispersion and reducibility of Ni nanoparticles with La2O3 modifier to form Al2O3+La2O3 yolk-shell catalyst structure for effective photo-assisted catalytic decomposition of methane (CMD).
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Catalytic methane decomposition (CMD) has emerged as an appealing technology for large-scale production of H2 and carbon nanostructures from natural gas. As the CMD process is mildly endothermic, the application of concentrated renewable energy sources such as solar energy under a low-temperature regime could potentially represent a promising approach towards CMD process operation. Herein, Ni/Al2O3-La2O3 yolk-shell catalysts are fabricated using a straightforward single-step hydrothermal approach and tested for their performance in photothermal CMD. We show that the morphology of the resulting materials, dispersion and reducibility of Ni nanoparticles, and nature of metal-support interactions can be tuned by addition of varying amounts of La. Notably, the addition of an optimal amount of La (Ni/Al-20La) improved the H2 yield and catalyst stability relative to the base Ni/Al2O3 material, while also favoring base growth of carbon nanofibers. Additionally, we show for the first time a photothermal effect in CMD, whereby the introduction of 3 suns light irradiation at a constant bulk temperature of 500 °C reversibly increased the H2 yield of catalyst by about 1.2 times relative to the rate in the dark, accompanied by a decrease in apparent activation energy from 41.6 kJ mol−1 to 32.5 kJ mol−1. The light irradiation further suppressed undesirable CO co-production at low temperatures. Our work reveals photothermal catalysis as a promising route for CMD while providing an insightful understanding of the roles of modifier in enriching methane activation sites on Al2O3-based catalysts.