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      Photocatalytic conversion of nitric oxide on titanium dioxide: cryotrapping of reaction products for online monitoring by mass spectrometry

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      Author
      Lu, W.
      Olaitan, A. D.
      Brantley, M. R.
      Zekavat, B.
      Erdogan, D. A.
      Ozensoy, E.
      Solouki, T.
      Date
      2016
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Electronic ISSN
      1932-7455
      Publisher
      American Chemical Society
      Volume
      120
      Issue
      15
      Pages
      8056 - 8067
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Details of coupling a catalytic reaction chamber to a liquid nitrogen-cooled cryofocuser/triple quadrupole mass spectrometer for online monitoring of nitric oxide (NO) photocatalytic reaction products are presented. Cryogenic trapping of catalytic reaction products, via cryofocusing prior to mass spectrometry analysis, allows unambiguous characterization of nitrous oxide (N2O) and nitrogen oxide species (i.e., NO and nitrogen dioxide (NO2)) at low concentrations. Results are presented, indicating that the major photocatalytic reaction product of NO in the presence of titanium dioxide (TiO2) P25 and pure anatase catalysts when exposed to ultraviolet (UV) light (at a wavelength of 365 nm) is N2O. However, in the presence of rutile-rich TiO2 catalyst and UV light, the conversion of NO to N2O was less than 5% of that observed with the P25 or pure anatase TiO2 catalysts.
      Keywords
      Catalysis
      Catalysts
      Mass spectrometry
      Nitric oxide
      Nitrogen oxides
      Oxide minerals
      Oxides
      Partial discharges
      Reaction products
      Spectrometry
      Titanium
      Titanium dioxide
      Catalytic reactions
      Low concentrations
      Mass spectrometry analysis
      Nitrogen dioxides
      Nitrogen oxide species
      Photocatalytic reactions
      Quadrupole mass spectrometer
      Ultraviolet lights
      Titanium oxides
      Permalink
      http://hdl.handle.net/11693/36743
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpcc.5b10631
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