Applied Catalysis B: Environmental
Applied Catalysis B: Environmental
5 years ago

Highly active Pt/NaxTiO2 catalyst for low temperature formaldehyde decomposition

Highly active Pt/NaxTiO2 catalyst for low temperature formaldehyde decomposition
A series of titania nanowires containing different Na content (Na x TiO2) were prepared from sodium titanate by varying the pH value of ion-exchange. They were used to load the Pt nanoparticles for low temperature formaldehyde catalytic oxidation. As prepared samples were systematically characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS), temperature programmed reduction/desorption/oxidation (TPR/TPD/TPO) and so on. The results showed that Na x TiO2 were consisted of anatase and sodium titanate. As pH value increased, the surface area and anatase content of catalyst decreased. Pt particles on Na x TiO2 were more easily oxidized and had smaller size but less exposed atoms compared with those on pure TiO2. The HCHO catalytic oxidation result exhibited that Pt/Na x TiO2 catalysts possessed excellent HCHO catalytic oxidation at ambient temperature that were 8.9–52.8 times the activities as that of Pt/TiO2. Kinetic studies manifested the easy activation of HCHO reaction over Pt/Na x TiO2 catalysts. Structure-performance analysis showed that the enhanced performance of Pt/Na x TiO2 catalysts was mainly attributed to two factors: increase in HCHO adsorption amount and change in HCHO decomposition pathway. According to HCHO-DRIFTS, linearly adsorbed CO generated from formate can react with hydroxyls to be carbonate/bicarbonate over Pt/Na x TiO2 catalysts. Simultaneously, the formate in Pt/Na x TiO2 catalyst with high Na content was also decomposed into a weak adsorbed CO. Both reaction pathways avoided the strong adsorption of CO on Pt/Na x TiO2 catalysts, which can facilitate the HCHO decomposition.

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317307221

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.