Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals
Figure 11
(a) The sensitivities of -based sensors having various combinations of additivities (Ca and Pt) and alumina supported metal catalysts (Pd and Pt) to methane at 658 K as a function of methane concentration. The additivities (0.1 wt.%) were added to by a coprecipitation method, while the supported catalysts (5 wt.%) were mixed with powder. (pure), (Ca), (Ca, Pt), (pure) + Pt:alumina, (pure) + Pd:alumina, and (Ca,Pt) + Pd:alumina. (b) Influences of Pd loading methods on the methane sensitivities at 658 K (net Pd loading: 0.25 wt.%). Impregnation from Pdsolution. Physical mixing of Pd black. Rinsing method. Physical mixing of Pd: alumina.
