Gas sensing and measuring device and process using catalytic gra

Details Gas sensing and measuring device and process using catalytic gra Gas sensing and measuring device and process using catalytic gra

1980-03-24

1981-05-05

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204195S, G01N 2752

Patent

active

042657148

ABSTRACT:
A gas detecting and measuring device and method highly selective for the detection of certain gases is described. The gas detector is capable of detecting and measuring a gas which can be electrochemically oxidized or electrochemically reduced at a voltage of between about 0.6 and 1.5 volts relative to a standard hydrogen electrode. The gas detecting and measuring device and process are highly selective for the oxides of nitrogen (NO.sub.x) and chlorine. The gas detecting device utilizes a hydrated, solid polymer electrolyte ion transporting membrane in electrical contact with an improved catalytic graphite sensing electrode. For detecting an oxidizable gas such as nitric oxide (NO), an improved graphite anode in contact with the solid polymer electrolyte is used with a cathode and a reference electrode as an electrochemical cell, and for detecting a reducible gas such as chlorine (Cl.sub.2) or nitrogen dioxide (NO.sub.2), an improved graphite cathode is used with an anode and a reference electrode as an electrochemical cell. Under an applied voltage, oxidizable gas is oxidized at the graphite anode and is detected or measured by a suitable circuit as a result of the current generated by the oxidation reaction, or reducible gas is reduced at the graphite cathode and is detected or measured by a suitable circuit as a result of the current generated by the reduction reaction.

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