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Title: Carbon monoxide sensor and method of use

Abstract

A sensor and method of use for detection of low levels of carbon monoxide in gas mixtures. The approach is based on the change in an electrical property (for example: resistance) that occurs when carbon monoxide is selectively absorbed by a film of copper chloride (or other metal halides). The electrical property change occurs rapidly with both increasing and decreasing CO contents, varies with the amount of CO from the gas stream, and is insensitive to the presence of hydrogen. To make a sensor using this approach, the metal halide film will deposited onto an alumina substrate with electrodes. The sensor may be maintained at the optimum temperature with a thick film platinum heater deposited onto the opposite face of the substrate. When the sensor is operating at an appropriate (and constant) temperature, the magnitude of the electrical property measured between the interdigital electrodes will provide a measure of the carbon monoxide content of the gas.

Inventors:
; ; ;
Publication Date:
Research Org.:
The Ohio State University Research Foundation,Columbus, OH (United States) NexTech Materials, Ltd., Worthington, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175619
Patent Number(s):
6,985,082
Application Number:
09/903,916
Assignee:
The Ohio State University Research Foundation (Columbus, OH); NexTech Materials, Ltd. (Worthington, OH) OSTI
DOE Contract Number:
FG02-99ER 86099
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Dutta, Prabir K., Swartz, Scott L., Holt, Christopher T., and Revur, Ramachandra Rao. Carbon monoxide sensor and method of use. United States: N. p., 2006. Web.
Dutta, Prabir K., Swartz, Scott L., Holt, Christopher T., & Revur, Ramachandra Rao. Carbon monoxide sensor and method of use. United States.
Dutta, Prabir K., Swartz, Scott L., Holt, Christopher T., and Revur, Ramachandra Rao. Tue . "Carbon monoxide sensor and method of use". United States. doi:. https://www.osti.gov/servlets/purl/1175619.
@article{osti_1175619,
title = {Carbon monoxide sensor and method of use},
author = {Dutta, Prabir K. and Swartz, Scott L. and Holt, Christopher T. and Revur, Ramachandra Rao},
abstractNote = {A sensor and method of use for detection of low levels of carbon monoxide in gas mixtures. The approach is based on the change in an electrical property (for example: resistance) that occurs when carbon monoxide is selectively absorbed by a film of copper chloride (or other metal halides). The electrical property change occurs rapidly with both increasing and decreasing CO contents, varies with the amount of CO from the gas stream, and is insensitive to the presence of hydrogen. To make a sensor using this approach, the metal halide film will deposited onto an alumina substrate with electrodes. The sensor may be maintained at the optimum temperature with a thick film platinum heater deposited onto the opposite face of the substrate. When the sensor is operating at an appropriate (and constant) temperature, the magnitude of the electrical property measured between the interdigital electrodes will provide a measure of the carbon monoxide content of the gas.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 10 00:00:00 EST 2006},
month = {Tue Jan 10 00:00:00 EST 2006}
}

Patent:

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  • Carbon monoxide sensors suitable for use in hydrogen feed streams and methods of use thereof are disclosed. The sensors are palladium metal/insulator/semiconductor (Pd-MIS) sensors which may possess a gate metal layer having uniform, Type 1, or non-uniform, Type 2, film morphology. Type 1 sensors display an increased sensor response in the presence of carbon monoxide while Type 2 sensors display a decreased response to carbon monoxide. The methods and sensors disclosed herein are particularly suitable for use in proton exchange membrane fuel cells (PEMFCs).
  • A method of lowering undesirable vehicle exhaust emissions includes preparing a catalyst for use in the exhaust stream of the vehicle. The method includes impregnating one group of alumina substrates with platinum, impregnating another group of alumina substrates with palladium, and then mixing the first and second groups of impregnated substrates.
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  • Only a part of the synthesis gas supply is passed through a first internally cooled catalytic reactor (1) and the hotter gas coming out of it is reunited with the remaining gas supply for passing through an adiabatic reactor (2) that is followed by a heat exchanger (3) on its way to a second internally cooled reactor (4) in which the methanization reaction is completed. Water is heated up to practically the saturated steam temperature in the cooling system of the last mentioned reactor and is converted to saturated steam in the cooling system of the first internally cooled reactor.more » The saturated steam is superheated in the above-mentioned heat exchanger. To make the process run more smoothly a steam drum is provided through which the hot water piping between the cooling systems of the two internally cooled reactors runs and the saturated steam is brought into the steam drum and from it to the heat exchanger before it is superheated. Additional heat exchangers are used for first preheating of the water and for two stages of preheating the synthesis gas. Adjustments of the proportion of the synthesis gas that goes through the first internally cooled reactor makes possible a control that assures that the outlet temperature of the adiabatic reactor will not exceed a safety limit required for the stability of the catalyst. No mechanical propulsion, nor compression, of the gas is necessary at any stage, nor any recycling, nor introduction of steam for control of the process.« less