| Autor: |
Mateo Rosado, Yamily, Ledoux, Alain, Balland, Laurent, Polaert, Isabelle |
| Předmět: |
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| Zdroj: |
Journal of Thermal Analysis & Calorimetry; Mar2024, Vol. 149 Issue 6, p2631-2642, 12p |
| Abstrakt: |
A new experimental method for the estimation of kinetic parameters using the signal of the heat flow from a differential scanning calorimeter is presented. An isothermal gas solid reaction was carried out in a differential scanning calorimeter (DSC) in continuous flow on a fixed bed of catalyst in the crucible. An instantaneous energy balance in steady state was made for estimate the total heat flow produced by the reaction and deduce the kinetics parameters. Hydrogenation of CO2 on Ni/Al2O3 solid catalyst was used to produce methane as base reaction. This reaction was chosen because it is very exothermic, and also a well-known reaction in terms of kinetics. A large range of stochiometric and non-stochiometric operating conditions were studied with ratios of reactants H2/CO2 between 3 and 7, diluted with N2 at different isothermal conditions in an interval of temperature between 573 and 673 K for different flow rates of mixture of gases. CO2 methanation involves several reactions in parallel where the main ones are the Sabatier reaction and the reverse water gas shift (RWGS) reaction. To keep the isothermicity of the catalytic bed, a theorical analysis of heat and mass transfer limitations was carried out to determine the absence of the internal and external limitation in the kinetic data. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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