Commercialization research of a metal DOC based on Fe-Cr-Ni substrate

• Metal DOC based on a Fe-Cr-Ni substrate was well activated at a low temperature.
• The performance reduction was not large upon excessive hydrothermal aging.
• We guess the performance decline according to aging temperature and time.
• Metal DOC on the basis of this study shows potential for commercialization.

The aim of this study is to investigate the possibility of commercialization through the evaluation of hydrothermal aging durability of diesel oxidation catalyst (DOC) catalysts based on a metal substrate that has higher thermal conductivity, larger physical strength and better performance at a high space velocity compared to a ceramic substrate. In the case of hydrothermal aging for 45 h at 800 °C, Pt had a maximum size of 200 nm and higher activation energy was required; eventually, there was a decrease in the activation point of the catalyst, leading to a decline in the catalyst performance. The harmful gases reached the light-off temperature (LOT 50) in the order: CO, NO, and THC respectively (ranked according to ascending temperature), while CO with low activation energy did not show a significant temperature difference upon reaching LOT 50 depending on hydrothermal aging conditions. A additionally, it was possible to approximate the a trend in performance decline by monitoring the aging temperature and time needed to reach LOT 50 and the maximum NO maximum conversion. The harmful gas reduction characteristics of the DOC based on a Fe-Cr-Ni substrate were well activated at a low temperature, and no substantial performance decline was observed upon excessive hydrothermal aging, leading the way to future commercialization of the catalyst.

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