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Spectroscopic Monitoring of the Heterogeneous Catalytic Decomposition of Gaseous Ammonia
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Abstract
New generations of electro–optic devices now make possible the relatively low-cost spectroscopic detection of many molecules. As part of our effort to cost-effectively modernize the physical chemistry laboratory curriculum, a 2.2 micron light-emitting diode and photodiode detector have been used to detect gaseous ammonia by infrared spectroscopy. A linear plot of absorbance versus pressure is observed when a stainless steel chamber, constructed from off-the-shelf vacuum hardware and fitted with two glass windows, is filled with ammonia. By installing a tungsten filament in the chamber, the heterogeneous catalytic decomposition of ammonia by a hot metal surface may be monitored. This is a classic example of a reaction that follows zero-order kinetics at relatively high ammonia pressures and moderate temperatures. Linear plots of absorbance versus time during the initial stages of the reaction and the observed independence of slope on ammonia pressure are consistent with a zero-order rate law.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Laboratory InstructionKeywords (Feature):
Advanced Chemistry Classroom and LaboratoryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
CatalysisCiting Articles
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This article has been cited by 2 ACS Journal articles (2 most recent appear below).
Real-Time Monitoring of Heterogeneous Catalysis with Mass Spectrometry
Mark A. YoungJournal of Chemical Education2009 86 (9), 1082Real-Time Monitoring of Heterogeneous Catalysis with Mass Spectrometry
Mark A. YoungJournal of Chemical Education2009 86 (9), 1082Heterogeneous, gas–solid processes constitute an important class of catalytic reactions that play a key role in a variety of applications, such as industrial processing and environmental controls. Heterogeneous catalytic chemistry can be demonstrated in a ...
Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash2007 973 (), 115-151Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash2007 973 (), 115-151Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
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History
- Received: August 03, 2009
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