Abstract
Structural formation process of Ni/SiO2 and Cu/SiO2 catalysts prepared by solution exchange of wet silica gel was investigated. Microstructures of Cu/SiO2 and Ni/SiO2 were quite different from each other. In the case of Cu/SiO2, Cu particles with diameter of ca. 3–5 nm dispersed homogeneously at less Cu content, and the particle size of Cu as well as pore size of silica gel support increased with increasing Cu content. In the Ni/SiO2, the Ni particles with diameter of ca. 6–10 nm gathered densely to form aggregates in silica matrix resulting in sea-island structure, whereas the size of Ni particle slightly increased with increasing Ni content. The difference in the structure of the metal-silica composites is probably caused by the difference in interaction between silica gel network and metal ions during drying and heating processes.
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Takahashi, R., Sato, S., Sodesawa, T. et al. Preparation of Cu/SiO2 Catalyst by Solution Exchange of Wet Silica Gel. Journal of Sol-Gel Science and Technology 19, 715–718 (2000). https://doi.org/10.1023/A:1008779226170
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DOI: https://doi.org/10.1023/A:1008779226170