Cellulose triacetate (CTA) was first
applied as the catalytic support
to load Pt nanoparticles for low-temperature formaldehyde (HCHO) decomposition.
The room-temperature HCHO decomposition rate of the obtained catalyst
(Pt/CTA) is 13.4 times and 4.3 times as high as that of the microcrystalline
cellulose-supported Pt catalyst and Pt/TiO2 under the parallel
preparation condition, respectively. With facile shaping, the CTA
microsphere-supported Pt catalyst and the CTA film-supported Pt catalyst
could also exhibit similar HCHO decomposition performance to that
of the powdery one. Structural analyses showed that Pt nanoparticles
(∼2.3 nm) could densely disperse on the small-area surface
of Pt/CTA and provide abundant active sites. Moreover, only the HCHO
molecules could slightly adsorb onto CTA, while other HCHO decomposition-related
species absolutely could not. This is beneficial to the coordination
of various steps of HCHO decomposition and the transfer of reaction
species to vicinal active sites of Pt/CTA. HCHO-diffuse reflectance
infrared Fourier transformed spectroscopy studies demonstrated that
no species were accumulated on the Pt/CTA catalyst. Both the good
Pt dispersion and unique adsorption properties of CTA were responsible
for the excellent low-temperature HCHO decomposition performance of
Pt/CTA.
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