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Analyzing Loose Contact Oxidation of Diesel Engine Soot and Ag/CeO2 Catalyst Using Nonlinear Regression Analysis

1Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

2Department of Chemical Science and Engineering, Tokyo National College of Technology, 1220-2 Kunugida-cho, Hachioji, 193-0997, Japan

Received: 18 Jul 2016; Revised: 12 Sep 2016; Accepted: 20 Sep 2016; Available online: 13 Feb 2017; Published: 30 Apr 2017.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2017 by Authors, Published by BCREC Group under

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Loose contact (LC) oxidation kinetics of carbon black (CB) model soot and Ag/CeO2 catalyst was deduced from thermogravimetric analysis (TG) experiments. In the LC mode at ≧750 K, CB particles were likely to be combusted also by non-catalyzed oxidation, especially those particles located far from the catalyst surface, as well as Ag/CeO2-catalyed oxidation. Since the non-catalyzed oxidation is not due to catalytic activity, in order to deduce the catalytic activity from TG data, a nonlinear regression analysis method was proposed in this study to extract only the catalyzed oxidation part of the TG data. It was verified that this was successfully done with the equations used by the very good curve fits to the experimental TG data, and the catalytic activity was correctly obtained from LC samples with various degrees of physical contact between the CB and catalyst. 

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Keywords: soot oxidation; Ag/CeO2; loose contact; nonlinear regression analysis; curve fitting

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