Production of CO-rich Hydrogen from Methane Dry Reforming Over Lanthania-Supported Cobalt Catalyst: Kinetic and Mechanistic Studies
In this study, the production of CO-rich hydrogen from methane dry reforming over lanthania-supported Co catalyst was investigated. The Co/La2O3 catalyst was synthesized via wet-impregnation method and characterized using instrument techniques such as TGA, FTIR, XRD, FESEM-EDX and N2 adsorption-des...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Elsevier
2016
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/11901/ http://umpir.ump.edu.my/id/eprint/11901/ http://umpir.ump.edu.my/id/eprint/11901/ http://umpir.ump.edu.my/id/eprint/11901/1/ayodele2016.pdf http://umpir.ump.edu.my/id/eprint/11901/7/Production%20of%20CO-rich%20Hydrogen%20from%20Methane%20Dry%20Reforming%20Over%20Lanthania-Supported%20Cobalt%20Catalyst-%20Kinetic%20and%20Mechanistic%20Studies.pdf |
| Summary: | In this study, the production of CO-rich hydrogen from methane dry reforming over lanthania-supported Co catalyst was investigated. The Co/La2O3 catalyst was synthesized
via wet-impregnation method and characterized using instrument techniques such as TGA, FTIR, XRD, FESEM-EDX and N2 adsorption-desorption analysis. The catalytic activity of the Co/La2O3 catalyst tested in a fixed bed stainless steel reactor yielded highest CH4 and CO2 conversion of 50% and 60% respectively at 1023 K and feed ratio of 1.0. The methane dry reforming reaction gave highest H2 and CO yield of 45% and 58% respectively. Furthermore, kinetics and mechanistic behavior of the La2O3 supported Co catalyst in
methane dry reforming reaction was investigated as a function of temperature and partial pressure of reactants (CH4 and CO2). The experimental data obtained from the kinetics measurements were fitted using the empirical power-law rate expression, as well as six different Langmuir-Hinshelwood kinetics models. The six models were then statistically and thermodynamically discriminated. Consequently, the Langmuir-Hinshelwood kinetics model (dual-site associative adsorption of both CH4 and CO2 with bimolecular surface reaction) was adjudged the best representative model. Activation energy values of 96.44 and 98.11 kJ mol�1 were obtained for the CH4 consumptions from the power-law and Langmuir-Hinshelwood models, respectively. A lower activation energy of circa 72 kJ mol�1
obtained for CO2 consumption showed that the rate of consumption of CO2 consumption was speedier than CH4. |
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