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Acetone Sensing and Catalytic Conversion by Pd-Loaded SnO2
Pascal M Gschwend1, Florian M Schenk1, Alexander Gogos2,3
1Particle Technology Laboratory, Department of Mechanical and Process Engineering, Institute of Energy and Process Engineering, ETH Zurich, Sonneggstrasse 3, CH-8092 Zurich, Switzerland.
Adding palladium (Pd) to tin oxide (SnO2) enhances acetone gas sensors. Optimal performance for detecting acetone as a lipolysis marker occurs at low Pd levels and specific temperatures, around 200-262.5 °C.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Noble metal additives enhance metal oxide gas sensor performance.
- Palladium (Pd) on tin oxide (SnO2) is a prominent combination.
- Acetone detection via breath analysis is crucial for monitoring lipolysis.
Purpose of the Study:
- To investigate the effect of varying palladium (Pd) quantities on nanostructured tin oxide (SnO2) gas sensors.
- To determine the optimal operating temperature for acetone sensing.
- To understand the relationship between Pd loading, operating temperature, and catalytic acetone oxidation.
Main Methods:
- Photodeposition of different Pd quantities (0-3 mol%) onto nanostructured SnO2.
- Evaluation of acetone sensing performance (sensitivity, response/recovery times) at various operating temperatures.
- Analysis of catalytic oxidation of acetone using Pd-loaded SnO2 in a packed bed.
Main Results:
- Pd addition can improve or degrade sensor performance based on loading and temperature.
- Optimal Pd loading for acetone sensing is below 0.2 mol%.
- Peak sensor performance is achieved at operating temperatures between 200-262.5 °C with approximately 50% acetone conversion.
Conclusions:
- Optimized Pd loading and operating temperature are critical for effective acetone gas sensing.
- Pd-loaded SnO2 sensors show promise for breath analysis applications.
- Understanding the catalytic oxidation mechanism is key to sensor performance enhancement.
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