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US 5,965,451 AGranted
Use of a gas sensor for the selective detection of hydrocarbons in low-oxygen gases
AssigneeDornier GmbH LHG
InventorsCarsten Plog, Werner Maunz
Life of this patent
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Abstract
The invention provides a gas sensor for selective detection of hydrocarbons in low-oxygen gases, having a capacitive element and a gas-permeable sensitive layer as a dielectric. The sensitive layer is a precious-metal-doped zeolite which has a regular crystalline structure made of primary pores whose diameter is in the order of the gas-kinetic diameter of the gas molecules to be detected.
Claims12
A method for selectively detecting a hydrocarbon in a gas, comprising:
- contacting said gas with a gas sensor, said gas sensor comprising a capacitive element and a gas-permeable sensitive dielectric layer in the form of a precious metal-doped zeolite having a regular crystalline structure made of primary pores having a diameter on the order of a gas-kinetic diameter of gas molecules to be detected;
- catalytically partially oxidizing said hydrocarbon at a sensor operating temperature;
- applying an alternating voltage;
- and
- measuring an impedance of the sensor,
- wherein said gas has an oxygen concentration of less than 10,000 ppm.
3 more elements
Dependencies are inferred from the claim text.