Surface analyses and modelling of rate multiplicity and instabilities

Technical Report · Thu Nov 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/6081617· OSTI ID:6081617

Harold, M P; Conner, W C

Catalytic partial and complete oxidations of chemical species are a quite important class of reactions in the production of many commercial chemicals and in the elimination of environmental pollutants. This research focuses on a sub-class of oxidation reactions in which CO is a key player -- be it a reactant, intermediate, or product -- in the catalytic sequence and chemistry. The first three years of our research has followed two parallel paths which have a common destination and which together provide a framework for the proposed new research. The first path has involved the development of a combined experimental/modelling and analysis methodology for constructing feasible mechanistic sequences and their corresponding kinetic models of catalytic reactions that exhibit multiple rate behavior. The rather well-studied Pt catalyzed CO oxidation served as the test reaction. Our approach involves the measurement of basic kinetic features (apparent reaction orders, activation energy) and multiplicity features (location of ignition and extinction points) over a wide range of conditions (catalyst temperature, total pressure, feed composition), and a kinetic modelling part, in which potential reaction sequences are constructed and screened based on their ability to predict the experimentally observed kinetic and multiplicity features over a wide range of conditions. The second path has involved the development of an under-utilized (in catalysis) spectroscopic technique, Fourier transform infrared emission spectroscopy (FTIRES), to monitor the surface of a catalyst during reaction. Main accomplishments from both studies are summarized.

• Research Organization: Massachusetts Univ., Amherst, MA (USA). Dept. of Chemical Engineering
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG02-87ER13772
• OSTI ID: 6081617
• Report Number(s): DOE/ER/13772-3; ON: DE91005891
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
33 ADVANCED PROPULSION SYSTEMS
CARBON MONOXIDE
OXIDATION
CATALYSTS
SURFACE PROPERTIES
EMISSION SPECTROSCOPY
PERFORMANCE TESTING
PLATINUM
CATALYTIC EFFECTS
ACTIVATION ENERGY
ADSORPTION
ALUMINIUM OXIDES
CATALYSIS
CATALYST SUPPORTS
CHEMICAL REACTION KINETICS
FOURIER TRANSFORMATION
IGNITION
INFRARED RADIATION
INHIBITION
MATHEMATICAL MODELS
NITRIC OXIDE
PRESSURE DEPENDENCE
PROGRESS REPORT
TEMPERATURE DEPENDENCE
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
INTEGRAL TRANSFORMATIONS
KINETICS
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RADIATIONS
REACTION KINETICS
SORPTION
SPECTROSCOPY
TESTING
TRANSFORMATIONS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400102 - Chemical & Spectral Procedures
330702 - Emission Control- Carbon Monoxide