Application of SnO2 Nanoparticles and Zeolites in Coal Mine Methane Sensors

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 22; no. suppl 1; p. 1
• Main Authors: Abruzzi, Rafael Colombo, Pires, Marçal José Rodrigues, Dedavid, Berenice Anina, Galli, Camila Fensterseifer
• Format: Journal Article
• Language: English
• Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01-01-2019; ABM, ABC, ABPol; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: Carbon dioxide; CO2 filter; coal mine atmospheres; ENGINEERING, CHEMICAL; MATERIALS SCIENCE, MULTIDISCIPLINARY; metal-oxide; METALLURGY & METALLURGICAL ENGINEERING; Methane; Nanoparticles; Operating temperature; Palladium; Pellets; Selectivity; Sensitivity; Sensors; Solid-state sensor; Tin dioxide; Tin oxides; Zeolites; Solid-state sensor; coal mine atmospheres; CO2 filter; zeolites; metal-oxide
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-mr-2018-0818

We evaluated solid-state sensors (MOS) manufactured using nanostructured tin oxide (SnO2) obtained by different synthesis methods for selectivity, response and repeatability at different operating temperatures and methane concentrations. In addition, Zeolite 13X pellets were placed in front of the sensors to improve CH4 selectivity in the presence of CO2. The palladium doped sensor (1.4% w/w) showed the highest sensitivity at 80 ºC (83%) and shorter response times (16 s), whereas non-doped sensors exhibited the best sensitivity (78%) and response times (14 s) for those with smaller particle size (8 nm). Zeolite 13X pellets proved to be efficient at making the sensor more selective for CH4 in the presence of CO2.