翻譯 In the case of Cu/γ-Al2O3, metal particles
In the case of Cu/γ-Al2O3, metal particles, with size in the 3–9 nm range, form quite dense ensemble on the support (figure 1A). Passing to the Cu/Fe2O3 system, Cu particles appeared more homogeneously located on the support, and their size distribution, although spread between the same limit values, exhibited a significantly higher presence of particles with size in the 4–7 nm domain (figure 1B). Finally, the Cu/TiO2 catalyst was found to contain very small Cu particles, highly homogeneously distributed on the TiO2 grains and with size essentially confined between 1 and 3 nm (figure 1C). In all samples the HRTEM analysis indicated the presence of a narrow distribution of quite small Cu particles, averaging 6.0 nm in diameter in the Cu/γ-Al2O3 and Cu/Fe2O3 samples and 2.2 nm in the Cu/TiO2 sample.
The Cu particle sizes are largely are quite small pointing out the powerful of solvated metal atoms in the generation of nanosized supported metal particles homogeneously distributed [27].