Catalytic Combustion of the Stoichiometric n-Butane/Air Mixture on Isothermally Heated Platinum Wire |
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Authors: | Dumitru Oancea Octavian Staicu Valentin Munteanu Domnina Razus |
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Affiliation: | (1) Department of Physical Chemistry, University of Bucharest, 4-12 Bd. Elisabeta, 030018 Bucharest, Romania;(2) “Ilie Murgulescu” Institute of Physical Chemistry, Roumanian Academy, 202 Spl. Independentei, 060021 Bucharest, Romania |
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Abstract: | The catalytic combustion of the stoichiometric n-butane–air mixture per se or diluted with N2, on a platinum wire at different initial pressures (10–70 kPa) and temperatures (690–1,080 K) was studied. The chemical heat
flow rate, dQ
r/dt, of the surface reaction was measured in isothermal and isobaric conditions and the overall kinetic parameters were evaluated
for both steady state and initial transient catalytic combustion. At low total pressure (10 kPa), the temperature dependence
of dQ
r/dt indicated a normal (Arrhenius) behavior for 690 < T < 900 K, while at higher temperatures, over 900 K, an anti-Arrhenius behavior was found. The obtained results are consistent
with a diffusion-controlled process, accompanied by reactant depletion around the catalytic surface, at higher temperatures. |
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Keywords: | Catalytic combustion Kinetics Platinum wire Isothermal regime n-Butane |
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