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Catalytic and Engine Exhaust Characterization Utilizing Gas Phase FTIR for Real Time Feedback*

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Catalytic and Engine Exhaust Characterization Utilizing Gas Phase FTIR for Real Time Feedback*

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Fourier Transform Infrared Spectroscopy (FTIR) based instruments have the advantage over many analyzers of a direct measurement that speciates components within the sample matrix without removing water from the gas stream. Testing confirms that the FTIR analyzer correlates very well to conventional emission analyzers used for total Nitrogen Oxides (NOx), CH4 , CO, CO2 and it also provides direct measurement of H2 O in the gas stream. The FTIR Total Hydrocarbon (THC) values calculated from the sum of the speciated components compares very well for fuels that have fewer higher hydrocarbon species, such as natural gas. With the use of surrogate compounds for longer chain hydrocarbons and correction factors that compensate for reduced FID responses to oxygenated species, the FTIR can also be used to estimate THC and NMOG for more complex exhaust gas samples.

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