Oxygen defective bimodal porous Ni-CeO2−x-MgO-Al2O3 catalyst with multi-void spherical structure for CO2 reforming of CH4. (April 2022)

• Record Type: Journal Article
• Authors: Kim, Beom-Jun; Seo, Jeong-Cheol; Kim, Dong-Hyun; Lee, Yeol-Lim; Lee, Kyubock; Roh, Hyun-Seog
• Is Part Of: Journal of CO₂ utilization. Volume 58(2022)
• Publication Date: 2022-04
• Subjects: Dry reforming of methane -- Spray pyrolysis -- Bimodal porosity -- Dextrin content -- Oxygen storage capacity; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.101917
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: Ni-CeO2 -MgO-Al2 O3 catalysts with bimodal meso-macropores have been synthesized by one-pot spray pyrolysis using dextrin as a structuring agent for dry reforming of methane. The formation of macropores originating from phase segregation and the decomposition of dextrin positively affects both the physical and chemical features of the catalysts, and therefore, the bimodal porous catalysts outperform the dense catalysts in catalytic activity and stability. The volume and size of macropores in a bimodal porous catalyst are dependent on the concentration of dextrin. Based on diverse characterization results, this morphological change has been revealed to induce the distortion of the CeO2 lattice and embedding of Ni nanoparticles, resulting in the strong interaction between the metal and support/promoter and high oxygen storage capacity. The catalyst with balanced bimodal pore structures and optimized physicochemical parameters showed the best performance, considering both catalytic activity and stability with high sintering/coking resistance in the dry reforming of methane. Graphical Abstract: Morphological changes by dextrin addition have been revealed to induce the distortion of the CeO2 lattice and embedding of Ni nanoparticles, resulting in catalytic stability of the catalyst for DRM. ga1 Highlights: The hierarchical porous catalyst was synthesized by spray pyrolysis using dextrin. The volume of the macropores was controlled by the concentration of dextrin. This morphological change induced distortion of CeO2 lattice and embedding of Ni. The distortion of CeO2 lattice and embedding of Ni result to the high OSC and SMSI. The optimized catalyst showed stable activity with high sintering/coke resistance.