Abstract
This work presents an attempt to apply the undoped n-type semiconductor CeO 2 in the detection of gases — acetone and NO — in an oxygen containing environment. However, in such gas mixture chemical reactions may take place at and near the hot sensor surface, changing the composition of the gas environment. The effect of CeO 2 — its catalytic activity — was studied in the oxidation of acetone and NO during their detection. For this purpose, a particular experimental set-up was planned and built: a special, flow type quartz microreactor connected to a mass spectrometer, offering the possibility for simultaneous resistance measurement and analysis of the near sensor gas composition. The sensor was operated both in self- and oven-heated mode between 20–900°C. The maximum sensitivity of CeO 2 was found between 350–450°C for both gases. While acetone causes a well measurable resistance change, the signal due to NO is quite small. The CeO 2 surface proved to be catalytically active in the oxidation of acetone resulting in the formation of CO 2. Surprisingly, the same surface led to the reduction of NO.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
