Highly ordered mesoporous silica film nanocomposites containing gold nanoparticles for the catalytic reduction of 4-nitrophenol

• Mohamad Azani Jalani,
• Leny Yuliati,
• Siew Ling Lee and
• Hendrik O. Lintang

Beilstein J. Nanotechnol. 2019, 10, 1368–1379, doi:10.3762/bjnano.10.135

• catalytic reduction of 4-NP to 4-AP. The turnover frequency (TOF) value of [AuNPs]red/silicahex at 210 °C as a thin-film catalyst was calculated to be 0.02 min−1, which is higher than that of [AuNPs]cal/silicahex at 250 °C with a value of 0.01 min−1. Such catalytic activity of the AuNP–film catalyst

Nanostructured, mesoporous Au/TiO₂ model catalysts – structure, stability and catalytic properties

• Matthias Roos,
• Dominique Böcking,
• Kwabena Offeh Gyimah,
• Gabriela Kucerova,
• Joachim Bansmann,
• Johannes Biskupek,
• Ute Kaiser,
• Nicola Hüsing and
• R. Jürgen Behm

Beilstein J. Nanotechnol. 2011, 2, 593–606, doi:10.3762/bjnano.2.63

• increase of the catalytic activity with film thickness indicates that transport limitations inside the Au/TiO2 film catalyst are negligible, i.e., below the detection limit. Keywords: Au catalysis; Au/TiO2; CO oxidation; gold nanoparticles; model catalysts; thin-film catalyst; Introduction There is a

• ) electrons as compared to a dispersed distribution of Au3+ ions and very small Au0 NPs. After calcination, the Au(4f) signal only shows the spin–orbit splitting of the Au(4f) state of Au0 species, without any indication of ionic species. The significantly higher Au content in the Au/TiO2 thin-film catalyst

• to its ‘normal’ value. While this argument appears plausible, definite proof for this hypothesis must wait for in situ IR measurements on the Au/TiO2 thin-film catalyst, which are planned for the future. The fact that the deactivation at 140 °C is still faster than observed on a dispersed Au/TiO2