A simplified approach to determine the activation energies of uncatalyzed and catalyzed combustion of soot

Date

2003-02-10

Author

Dernaika, B
Üner, Deniz

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

172
views

0
downloads

Catalyst screening tests for soot oxidation is usually performed in semi-batch mode under a temperature ramp-up. Due to the complexity of soot combustion process, generally the activation energy data are not reported. Rather, the catalyst performances are compared on the basis of temperatures required to achieve a certain conversion. In this study, the Redhead method [Vacuum, 12 (1963) 203] of activation energy determination for temperature programmed desorption processes was adopted for soot combustion processes. The method was applied to extract loose contact activation energies of catalytic oxidation of soot over pure and 1 wt.% Pt/oxide. The oxides investigated in this study are SiO2, gamma-Al2O3, TiO2, ZrO2, CeO2 and La2O3. The dry air activity of pure oxides was screened by thermo-gravimetric analysis (TGA) while the activity tests on Pt/oxide catalysts were performed in a home built temperature programmed oxidation (TPO) set-up. The activation energies for soot oxidation determined for these catalysts by a differential method, by an integral method and by Redhead method indicated that the Redhead method provides reasonable estimates of activation energies from peak temperature data of the temperature programmed experiments such as TGA or TPO. Comparison of the activation energies determined as such revealed little difference in the soot combustion activities of the oxides in the presence of Pt in dry air atmosphere.

Subject Keywords

Catalytic soot oxidation, Redhead analysis

URI

https://hdl.handle.net/11511/39782

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL

DOI

https://doi.org/10.1016/s0926-3373(02)00152-2

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

A nonintrusive diagnostics technique for flame soot based on near-infrared emission spectrometry Ayrancı Kılınç, Işıl; Selçuk, Nevin; Department of Chemical Engineering (2007) A novel nonintrusive soot diagnostics methodology was developed, validated and applied for in-situ determination of temperature, volume fraction and refractive index of soot aggregates formed inside flames by using near-infrared emission spectrometry. Research was conducted in three main parts, first one addressing development and validation of a comprehensive "direct" model for simulation of line-of-sight radiative emission from axisymmetric sooty flames by coupling sub-models for radiative transfer, radia...
A new baseline for the Newtonian thermal analysis of casting: two-capacitive system baseline Modeling the effects of the thermal capacity of mold Erbas, Kadir Can (2015-01-01) Computer-aided cooling curve thermal analysis for the casting process is usually applied to predict the latent heat of transformation and the solid fraction. In this study, one of the important limitations of the Newtonian thermal analysis for the prediction of the latent heat was determined as the disregard of the thermal capacity of mold. Therefore, a new baseline technique, two-capacitive system baseline (TCSBL), was developed by taking the thermal capacity of the mold into account. This new method was m...
Electrochemical and chemical oxidation of K(C2H5OCS2),[Ni(C2H5OCS2)(2)] and [N(C2H5)(4)][Ni(C2H5OCS2)(3)] Dag, O; Önal, Ahmet Muhtar; Isci, H (1996-06-26) Electrochemical and chemical oxidation of (Et-Xan(-)), [Ni(Et-Xan)(2)] and [Ni(Et-Xan)(3)](-) (Et-Xan(-) = C2H5OCS2- have been studied by Cyclic Voltammetry and in situ UV-Vis spectroscopy in acetonitrile at room temperature. Cyclic Voltammograms (CV) of Et-Xan(-) and Ni(Et-Xan)(2) display one (0.00 V) and two (0.35 and 0.80 V) irreversible oxidation peaks, respectively, referenced to Ag/Ag+(0.10 M) electrode. However, CV of Ni(Et-Xan)(3)(-) displays one reversible (-0.15 V) and two irreversible (0.35, 0.80...
The Characterization of a Tar Sand Sample Using Differential Scanning Calorimeters Senguler, I.; Kök, Mustafa Verşan (2013-01-01) In this study, non-isothermal kinetics and a thermal analysis tar sand sample is studied by differential scanning calorimeter and pressurized differential scanning calorimeter. Differential scanning calorimeter and pressurized differential scanning calorimeter curves revealed two reaction regions in the temperature range of 20-600 degrees C. Effect of pressure was also studied in order to see the thermal behavior of a tar sand sample under different elevated pressures. Two different kinetic methods (ASTM an...
Preparation and morphological characterization of a catalytic soot oxidation SiC foam filter Caglar, Basar; Üner, Deniz (2007-01-01) The coating characteristics of Pb-Co mixed metal oxide soot oxidation catalysts over a SiC foam filter were studied. The coating was done via incipient wetness impregnation of a slurry with Pb/Co weight ratio = 2. The coating was accomplished by 3 consecutive impregnation-drying-calcination cycles. After each cycle surface structure and composition were monitored by scanning electron microscope (SEM). SEM analysis revealed that the surface composition of Pb was high on the high porosity region and surface c...

Citation Formats

B. Dernaika and D. Üner, “A simplified approach to determine the activation energies of uncatalyzed and catalyzed combustion of soot,” APPLIED CATALYSIS B-ENVIRONMENTAL, pp. 219–229, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39782.