Transition metal oxide based calorimetric non-methane hydrocarbo

Details Transition metal oxide based calorimetric non-methane hydrocarbo Transition metal oxide based calorimetric non-methane hydrocarbo

1996-03-27

1998-04-07

Warden, Jill

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 83, 422 94, 422 95, 422 97, 422 98, 436133, 436134, 436137, 436141, 436143, 436147, 436149, 436152, 65 605, 65 6052, 4271263, 4271266, G01N 2716

Patent

active

057361045

ABSTRACT:
A transition metal oxide based calorimetric non-methane hydrocarbon sensor (100) is constructed by disposing a transition metal based catalyst (105), preferably chromium oxide (Cr.sub.2 O.sub.3), onto a carrier (101). A temperature measurement device (103) is positioned thermally coupled to the transition metal based catalyst (105). A preferred application includes sensing non-methane heavy hydrocarbons in an automotive exhaust gas stream (803) by exposing a transition metal oxide catalyst based sensor (805) to the exhaust gas stream (803) and providing a signal (811) indicative of a concentration of non-methane heavy hydrocarbons and carbon monoxide (CO). Then, exposing a compensating sensor (807) to the same exhaust gas stream (803) and providing a compensating signal (813) indicative of a concentration of carbon monoxide (CO). By combining the signal (811) and the compensating signal (813), a measure of non-methane heavy hydrocarbons can be provided.

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Allan Symons, Catalytic Gas Sensors, 1992, pp. 169-185.

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