Formaldehyde Combustion on Nickel Oxide (Multiplicity, Modeling Fuel, Auto Catalytic)
Foster, James Joseph
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https://hdl.handle.net/2142/69744
Description
Title
Formaldehyde Combustion on Nickel Oxide (Multiplicity, Modeling Fuel, Auto Catalytic)
Author(s)
Foster, James Joseph
Issue Date
1984
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Abstract
The kinetics and mechanism of formaldehyde combustion on nickel oxide at 493 degrees Kelvin were investigated. Formaldehyde was chosen because it has the attributes of a good modeling fuel--it reacts through a series of dehydrogenation and oxidation reactions and its gas phase combustion is extendable to higher order hydrocarbon. Nickel oxide was chosen for its activity in dehydrogenation and oxidation reactions. This activity falls in the middle of all the transition metal oxides.
The catalyst used in the kinetics experiments was oxidized nickel foil. The reaction occurred in a modified Berty reactor and the results were analyzed in the same manner as a constant stirred tank reactor (CSTR). The combustion products were detected with a gas chromatograph.
The combustion reaction had an isothermal multiplicity in oxygen concentration. Additionally, there was a rate enhancement by carbon dioxide adsorbing onto the catalytic surface creating new reaction sites. A nonlinear regression technique was employed to analyze the postulated rate equation using the experimental data. The rate equation best fitting the data was derived and it shows isothermal multiplicity and has a low sum of squares. The equation and the assumptions on the mechanism were well supported by previous researchers.
The kinetic experiments used a silica supported nickel oxide catalyst in conjunction with a Fourier Transform Infra-Red (FT-IR) spectrophotometer meter at 423(DEGREES) Kelvin. These experiments showed carbon dioxide was not adsorbed onto the nickel oxide under the conditions used. The non-adsorption on the nickel oxide/silica catalyst contradicts the results of previous researchers.
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