Method for improved detection of carbon monoxide by infrared absorption spectroscopy
AssigneeHRL Laboratories, LLC
InventorsKevin W. Kirby, Amanda C. Phelps, Robert N. Schwartz
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Abstract
A method for detecting the presence and amount of carbon monoxide, comprising the use of infrared spectroscopy to compare the spectra of the test gas containing carbon monoxide and the reference gas. The reference gas is the test gas from which carbon monoxide had been removed by conversion using catalysts. The presence and quantity of carbon monoxide is determined by deducting the spectrum of the reference gas from the spectrum of the test gas. The catalysts comprise nanoparticles of gold precipitated on a metal oxide or hydroxide carrier. An apparatus implementing this method.
Claims34
A method for detection of carbon monoxide in a gas feed stream mixture containing carbon monoxide in between about 10 to about 100 parts per million and between about 40% and about 50% by volume of hydrogen, comprising the steps of:
- (a) periodically directing said feed gas stream mixture through one or more beds of a layer of a catalyst so as to eliminate or substantially reduce said carbon monoxide and to produce a reference gas;
- (b) directing said reference gas through an instrument capable of measuring carbon monoxide;
- (c) measuring carbon monoxide in said reference gas and adjusting the instrument to make measurement (c) the zero point reference measurement;
- (d) directing said gas feed stream mixture to said instrument;
- (e) measuring carbon monoxide in said feed gas stream mixture, wherein measurement (e) is corrected using the, zero point reference measurement calculated in step (c).
A method for detection of carbon monoxide in a gas feed stream mixture containing carbon monoxide in between about 10 to about 100 parts per million and between about 40% and about 50% by volume of hydrogen, comprising the steps of:
- (a) periodically directing said feed gas stream mixture through one or more beds of a layer of a catalyst so as to eliminate or substantially reduce said carbon monoxide and to produce a reference gas;
- (b) directing said reference gas through an instrument capable of measuring carbon monoxide;
- (c) measuring carbon monoxide in said reference gas and adjusting the instrument to make measurement (c) the zero point reference measurement;
- (d) directing said gas feed stream mixture to said instrument;
- (e) measuring carbon monoxide in said feed gas stream mixture, wherein measurement (c) is corrected using the zero point reference measurement calculated in step (c);
- and
- (f) adding small amounts of ambient air to the sample of gas in the appropriate place of the sequence of steps.
Dependencies are inferred from the claim text.