Journal of Physical Chemistry C
Journal of Physical Chemistry C
4 years ago

In Situ DRIFTs Investigation of Promotional Effects of Tungsten on MnOx-CeO2/meso-TiO2 Catalysts for NOx Reduction

In Situ DRIFTs Investigation of Promotional Effects of Tungsten on MnOx-CeO2/meso-TiO2 Catalysts for NOx Reduction
Tingting Yan, Hongrui Li, Sixiang Cai, Kaiwen Zha, Hang Hu, Dengsong Zhang, Liyi Shi
In this work, mesoporous TiO2 spheres supported MnCeW mixed oxide catalysts (MnCeW/m-TiO2) for selective catalytic reduction of NOx with NH3 were prepared by a wet impregnation method. It is interesting that the MnCeW/m-TiO2 catalysts exhibited excellent SCR activity and N2 selectivity in a wide temperature range, even under the high gas hourly space velocity. From in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTs) studies of desorption, it could be concluded that the addition of tungsten brought about more Brønsted acid sites and reduced the energy barrier of NOx species adsorbed on the surface. At high temperature range, there were still some Brønsted acid sites and NOx species including bidentate nitrate and nitro compounds in MnCeW/m-TiO2, therefore more intermediates could take part in the SCR reactions as well as better catalytic performance. Besides, the in situ DRIFTs of transient reactions indicated that the formed NH3 species and NOx species of MnCeW/m-TiO2 were more reactive due to the promotional effects of tungsten. A series of traditional characterizations also revealed the promotional effects of tungsten for surface active elements, catalytic redox properties, and acid sites of NH3 adsorption. In a word, all the results confirmed that the introduction of W could enhance active NH3 and NOx species as well as surface active elements, thus contributing to the catalytic performance. The present investigations may open a path for design and application of catalysts with outstanding catalytic activity and selectivity.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b08600

DOI: 10.1021/acs.jpcc.7b08600

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.