Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1996-09-11
1999-04-27
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204426, 205781, G01N 27407
Patent
active
058977597
ABSTRACT:
The present invention discloses a NOx sensor consisting at least of a pair of the first and the second electrodes formed in touch with an ion conductive solid electrolyte; wherein at least the first electrode is selected from hybrid oxides having perovskite structure expressed by MSnO.sub.3 (M is at least an element selected from Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn and Cd, hybrid oxides having pseudo-perovskite structure expressed by M.sub.2 SnO.sub.4 (M is at least an element selected from Mg, Ca, Sr, Ba, Mn, Co, Zn and Cd) or a substance containing said hybrid oxides and the second electrode is selected from a noble metal or a electro conductive ceramics which does not have electro conductivity in the atmosphere of NOx and the concentration of NOx in the test gas is detected by the change of the electromotive force between the first and second electrodes.
REFERENCES:
patent: 4011149 (1977-03-01), Nozik
patent: 5045170 (1991-09-01), Bullock et al.
patent: 5273628 (1993-12-01), Liu et al.
patent: 5397442 (1995-03-01), Wachsman
patent: 5405718 (1995-04-01), Hashemi
Hideyuki Kurosawa et al., "Solid Electrolyte NOx Sensor Using Oxide Ion Conductor", The 18th Chemical Sensor Meeting, vol. 10, pp. 73-76 (1993) month unavailable.
Lawrenz et al, "Investigations on the determination of NO with galvanic ZrO.sub.2 solid electrolyte cells", Fresenius J. Anal Chem, (1994) month unavailable, pp. 679-683.
Hasei Masaharu
Kurosawa Hideyuki
Miura Norio
Yamazoe Noboru
Kabushiki Kaisha Riken
Tung T.
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