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Emission Control Science and Technology
Published in: Emission Control Science and Technology 2/2023

18-05-2023

An Experimental Study on the Conversion of CaO to CaSO4 During Diesel Particulate Filter Regeneration

Authors: Kotaro Tanaka, Yasuyuki Sakai, Yudai Ishii, Yusuke Yokobayashi, Satoshi Sakaida, Mitsuru Konno

Published in: Emission Control Science and Technology | Issue 2/2023

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Abstract

The deposition of ash on a diesel particulate filter (DPF) results in an increase in pressure drop across the aftertreatment system, which leads to reduced capacity for soot and an increase in frequency of regeneration to eliminate the soot. To estimate the amount of ash and design a reduction method for the accumulated ash on the DPF, a deeper understanding of the ash generation mechanism is required. Previous studies have found that ash sampled at exhaust manifolds comprises metal sulfate and some oxides, whereas ash accumulated on DPFs primarily comprises typical metal sulfates. Although metal oxides are converted to the metal sulfates, the conversion mechanism is not well understood. Herein, the formation mechanism of calcium sulfate (CaSO4), which is the main component of ash on DPFs, from calcium oxide (CaO) was investigated using a flow reactor. CaO was made to react with SO2, SO3, O2, and H2O, when passed through a diesel oxidation catalyst. Quantitative analysis of the ash components in the products was performed using ion chromatography. The concentrations of SO2, SO3, and H2O during the reaction were analyzed by Fourier-transform infrared spectroscopy. Based on the experimental results, it was found that CaSO4 mainly formed from the reaction of CaO with SO2 and SO3; whereas, H2O inhibited CaSO4 formation owing to the change in physicochemical properties of CaO.
previous article Simulating Catalytic Reaction and Soot Oxidation in Coated Particulate Filters: a Simplified Modelling Framework Including Diffusion Effects
next article Particle Number Emission for Periodic Technical Inspection in a Bus Rapid Transit System

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Metadata
Title
An Experimental Study on the Conversion of CaO to CaSO4 During Diesel Particulate Filter Regeneration
Authors
Kotaro Tanaka
Yasuyuki Sakai
Yudai Ishii
Yusuke Yokobayashi
Satoshi Sakaida
Mitsuru Konno
Publication date
18-05-2023
Publisher
Springer International Publishing
Published in
Emission Control Science and Technology / Issue 2/2023
Print ISSN: 2199-3629
Electronic ISSN: 2199-3637
DOI
https://doi.org/10.1007/s40825-023-00227-y

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