Exhaust gas treatment catalysts for ammonia-fueled engines

Presented on November 16, 2022 during the Ammonia Energy Conference 2022

Authors Issei Tsuji Tomoo Ikoma Hiroki Okamoto Nobuyuki Aoi Toshiya Nashida Yasushi Fujimura Nikki-Universal

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Abstract

Ammonia is expected to be a promising zero-emission fuel because it does not emit CO2 during combustion. However, the exhaust gas from the actual ammonia-fueled engines contains unburned ammonia, nitrogen oxides (NOx), and nitrous oxide (N2O), and there is a need to develop technologies to remove these harmful substances. Unburned ammonia can be removed by a catalytic combustion method using a conventional oxidation catalyst, but NOx and N2O are simultaneously generated as byproducts. Therefore, Nikki-Universal has developed a new catalyst that can remove ammonia at high efficiency while reducing the generation of NOx and N2O. We have also developed a SCR-DeNOx catalyst, which can effectively remove both N2O and NOx. The drawback of the SCR catalyst is that it requires the injection of ammonia as a reducing agent. We are also developing a direct N2O destruction catalyst that can directly decompose N2O into N2 and O2 without ammonia injection.

Topics Ammonia Combustion Ammonia Engine Catalysts NOx Emissions

Authors Issei.Tsuji Tomoo.Ikoma Hiroki.Okamoto Nobuyuki.Aoi Toshiya.Nashida fujimura.yasushi@jgc.com