Kinetics of <b><i>o</i></b>‐Xylene Combustion over a Pt/Alumina Catalyst

Manta, Corina Mihaela; Bozga, Grigore; Bercaru, Georgeta; Bîldea, Costin Sorin

doi:10.1002/ceat.201200371

Cited by 12 publications

(14 citation statements)

References 24 publications

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“…As already mentioned, an important issue in the application of the integral method using the fixed‐bed conversion data is the occurrence of axial temperature gradients. The results of Ordóñez et al 25 and some of our previous results 14, 15 demonstrate that, for diluted catalysts, the axial temperature gradients along the catalyst bed arising for VOC conversions up to around 40 % can be neglected. In the present study, the kinetic parameter estimation based on the integral method will be performed in two variants, one using conversion values below 10 % (in comparison with the differential method) and the other for conversions up to 20 % (in order to reduce the influence of measurement errors, keeping the values of the axial temperature gradients negligible).…”

Section: Resultsmentioning

confidence: 66%

“…The catalyst used was Pt/ γ ‐Al 2 O 3 containing 0.5 wt % Pt, produced by Engelhard (ESCAT 26). Previous studies performed on the same catalyst, on the combustion of VOC with comparable reactivity, reported that the influence of internal diffusion on the process kinetics is negligible for catalyst particle sizes lower than 250 μm 14. Hence, all the experiments reported further in this study were performed with catalyst particles in the size range of 50–250 μm.…”

Section: Methodsmentioning

confidence: 93%

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Kinetic Study of Methyl Isobutyl Ketone Combustion over a Commercial Pt/Alumina Catalyst

et al. 2016

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Catalytic combustion of methyl isobutyl ketone (MIBK) in diluted air mixtures over a commercial Pt/Al 2 O 3 catalyst was experimentally investigated in a continuous laboratory setup. The experimental data were used to develop a kinetic model of the MIBK combustion over the Pt/Al 2 O 3 catalyst. Among the available kinetic theories, the Langmuir-Hinshelwood one proved to be the most appropriate for the obtained data. The kinetic parameters of the formulated rate expression were estimated using both differential and integral methods. The adequacy of the proposed kinetic model and the estimated parameter values were tested by statistical criteria and thermodynamic consistency. The computation results indicate that the integral method, based on a heterogeneous reactor model, is the recommended approach in the estimation of the kinetic parameters for catalytic combustion processes involving volatile organic compounds.

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Section: Resultsmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 93%

Kinetic Study of Methyl Isobutyl Ketone Combustion over a Commercial Pt/Alumina Catalyst

et al. 2016

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“…This technology was first used on the Japanese market in 1994, coupled to a lean burn engine [3], and was introduced in Europe by Toyota in 2005, with the diesel particulate NO x reduction (DPNR) designation [9][10][11][12][13][14]. The model NSR catalyst usually contains three components: a NO x storage component such as Ba, a NO x oxidation/reduction precious metal such as Pt, and a high-surface-area support, usually Al 2 O 3 [15][16][17]. A typical NSR consists of fine porous ceramic monoliths containing thousands of parallel channels through which the ex-haust gases are directed.…”

Section: Introductionmentioning

confidence: 99%

Combined Fixed‐Bed Reactor and In Situ DRIFTS Tests of NO Adsorption on a NOx Storage‐Reduction System Catalyst

Wu¹,

Tschamber²,

Limousy³

et al. 2013

Chem Eng & Technol

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International audienceThe effect of water on NOx storage performance of a Pt/BaO/Al2O3 catalyst was investigated. The adsorption capacity of a model NOx storage-reduction system (NSR) catalyst was studied in the presence of NO, oxygen, and water in nitrogen. Fixed-bed and in situ DRIFTS adsorption tests were carried out in order to evaluate the influence of water on the adsorption capacity of the catalyst, adsorbed species on the surface of the catalyst, and stability of these species. The presence of water slightly reduces the NOx storage capacity of the NSR catalyst. A decrease of platinum oxidation activity was observed which was correlated to a slowdown of surface bidentate nitrate formation, detected by in situ DRIFTS tests. On the other hand, surface monodentate nitrates were favored and formation of bulk nitrates was not affected. A set of reactions corresponding to these observations is proposed

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“…The development of a suitable kinetic model for catalytic combustion of VOCs represents a key element in the prediction of the reaction mechanism . The catalytic combustion kinetics must be taken into account for designing a reliable catalytic combustion reactor and improving the catalytic combustion performance of the existing catalyst .…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion kinetics of isopropanol over novel porous microfibrous‐structured ZSM‐5 coating/PSSF catalyst

et al. 2014

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Porous thin-sheet cobalt-copper-manganese mixed oxides modified microfibrous-structured ZSM-5 coating/PSSF catalysts were developed by the papermaking/sintering process, secondary growth process, and incipient wetness impregnating method. Paper-like sintered stainless steel fibers (PSSF) support with sinter-locked three-dimensional networks was built by the papermaking/sintering process, and ZSM-5 coatings were fabricated on the surface of stainless steel fibers by the secondary growth process. Catalytic combustion performances of isopropanol at different concentrations over the microfibrous-structured Co-Cu-Mn (1:1:1)/ZSM-5 coating/PSSF catalysts were measured to obtain kinetics data. The catalytic combustion kinetics was investigated using power-rate law model and Mars-Van Krevelen model. It was found that the Mars-Van Krevelen model provided fairly good fits to the kinetic data. The catalytic combustion reaction occurred by interaction between isopropanol molecule and oxygen-rich centers of modified microfibrous-structured ZSM-5 coating/PSSF catalyst. The reaction activation energies for the reduction and oxidation steps are 60.3 and 57.19 kJ/mol, respectively.

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Kinetics of o‐Xylene Combustion over a Pt/Alumina Catalyst

Cited by 12 publications

References 24 publications

Kinetic Study of Methyl Isobutyl Ketone Combustion over a Commercial Pt/Alumina Catalyst

Kinetic Study of Methyl Isobutyl Ketone Combustion over a Commercial Pt/Alumina Catalyst

Combined Fixed‐Bed Reactor and In Situ DRIFTS Tests of NO Adsorption on a NOx Storage‐Reduction System Catalyst

Catalytic combustion kinetics of isopropanol over novel porous microfibrous‐structured ZSM‐5 coating/PSSF catalyst

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