Facile preparation of Fe-Beta zeolite-supported transition metal oxide catalysts and their catalytic performance for the simultaneous removal of NOx and soot

Diesel engine exhaust comprises nitrogen oxides (NOx) and soot particles, which cause serious air pollution. However, owing to the contradictory nature of NOx reduction and soot oxidation, a trade-off exists in the simultaneous removal of NOx and soot. Consequently, catalytic technology has become a hot research topic. This study prepared MOd/Fe-Beta (M = Fe, Co, Ni, Mn, Cu) catalysts through incipient wetness impregnation using Fe-Beta as the support and explored the catalytic performance of the above catalysts. The results exhibited the good performance of the prepared catalysts. The introduction of Mn resulted in a lower peak temperature of soot combustion for the catalyst, and slightly decreased deNOx performance of Fe-Beta. The soot combustion temperature was as low as 422 degrees C, and the temperature window for 80% NO conversion was 164-423 C. The interaction between MnOd and zeolite can regulate the acid sites and produce sufficient active oxygen species for the catalyst. The catalytic activity of the MnOd/Fe-Beta catalyst is due to its strong redox property, the appropriate number of acid sites, and sufficient number of active oxygen species. In addition, the catalyst had good stability and water and sulfur resistance, therefore it had great potential for future application in the simultaneous removal of NOx and soot from diesel engine exhaust. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.