NO.sub.x sensor

Details NO.sub.x sensor NO.sub.x sensor

1998-09-25

2000-02-01

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 205781, G01N 27407

Patent

active

060198818

ABSTRACT:
The present invention discloses a NO.sub.x sensor consisting at least of a pair of the first and the second electrodes formed in touch with an oxygen conductive solid electrolyte; wherein at least the first elelctrode is composed of oxides of an element selected from 7a Group or 8 Group, especially from Mn, Fe, Co, and Ni or a substance containing said oxides or of hybrid oxides (including the one of oxygen deficiency expressed by ABO.sub.3, AB.sub.2 O.sub.4, A.sub.2 BO.sub.4 and ACBO.sub.4 including 7a Group and 8 Group. A NO.sub.x sensor acording to the present invention has a good sensitivity without being affected by the concentration of CO.sub.2 and detects NO.sub.x concentration in an exhaust gas at a temperature above 600.degree. C.

REFERENCES:
patent: 4502939 (1985-03-01), Holfelder et al.
patent: 4587105 (1986-05-01), Bonne et al.
patent: 4720335 (1988-01-01), Fukushima et al.
patent: 5037525 (1991-08-01), Badwal
patent: 5397442 (1995-03-01), Wachsman
Lawrenz et al;"Investigations on the determination of NO with galvanic ZrO.sub.2 solid electrolyte cells"; Fresenius J. Anal Chem.; vol. 349, pp. 679-683, 1994, month unavailable.
Yao et al; "Use of Sodium Nitrite Auxiliary Electrode for Solid Electrolyte Sensor to Detect Notrogen Oxides"; Chem. Letters; pp. 587-590, 1992, month unavailable.
Shimizu et al; "Solid Electrolyte NO.sub.2 Sensors Fitted with Sodium Nitrate and/or Barium Nitrate Electrodes"; Denki Kagaku; vol. 59, No. 6, pp. 465-472, 1991, month unavailable.
Murphy et al, "Foundation of College Chemistry", 2d ed., (1975), p. 90.

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