Journal
JOURNAL OF CATALYSIS
Volume 424, Issue -, Pages 152-161Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2023.05.019
Keywords
Photodeposition; Metal-support interaction; Rutile; Catalytic oxidation; Formaldehyde
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By increasing the irradiation intensity, the interaction between Pt and TiO2 is strengthened, resulting in enhanced activity for HCHO oxidation. The balanced electronic and spatial structure promote the activation of oxygen species, facilitating both the conversion of dioxymethylene to HCOO- and the subsequent decomposition of HCOO-.
The metal-support-interaction (MSI) has been attracting close attention for HCHO oxidation due to its specific electronic and structural effects. Here, we report a mild photochemical strategy for the modulation of the MSI between Pt and rutile TiO2. By increasing the irradiation intensity, more electrons were enriched on Pt and the contact between Pt and TiO2 became stronger, and even induce the encapsulation of Pt nanoparticles by TiO2. The apparent activation energies were 45.4 and 38.8 kJ/mol over the samples with weaker (P40) or stronger (P500) MSI, while decreased to 9.1 kJ/mol on the sample (P120) with moderate MSI. The promoted activity was much higher than that of most reported anatase and P25-based Pt/ TiO2 catalysts. The balanced electronic structure and spatial structure favor the activation of oxygen species, thus promoting both the conversion of dioxymethylene to HCOO- species and the following decomposition of HCOO-.
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