Photocatalytic conversion of nitric oxide on titanium dioxide: cryotrapping of reaction products for online monitoring by mass spectrometry
Author
Lu, W.
Olaitan, A. D.
Brantley, M. R.
Zekavat, B.
Erdogan, D. A.
Ozensoy, E.
Solouki, T.
Date
2016Source 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
ArticleItem 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
CatalysisCatalysts
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