Graphene aerogel loaded with CeO2 as a catalyst for selective catalytic reduction of NOx with NH3 at low temperature

NH3 selective catalytic reduction (NH3-SCR) has been a common method for eliminating nitrogen oxides (NOx) from the flue gas. The low-temperature denitrification has sparked widespread concern. Here, a CeO2/ graphene aerogel (CeO2/GA) catalyst material was synthesized by a one-step hydrothermal method using a three-dimensional (3-D) porous graphene aerogel structure as a carrier for NH3-SCR at low-temperature. The presence of nanoparticle CeO2 inhibited agglomeration between graphene sheets, while the graphene aerogel as a carrier produced a porous structure and improved nanoparticle dispersal. The specific surface area of composite catalyst material was 178.68 m2/g. Catalysts with efficient charge transfer and abundant chemisorbed oxygen promoted redox reactions, more acidic sites were essential to improving catalytic activity. At 270 degrees C, the NOx conversion (94.9%) of this catalyst was 2.9 times higher than that of pure CeO2 and it demonstrated good N2 selectivity and catalytic stability.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, a CeO2/graphene aerogel catalyst material was synthesized and used for low-temperature NH3 selective catalytic reduction (NH3-SCR) to eliminate nitrogen oxides (NOx) from flue gas. The catalyst exhibited excellent catalytic performance and stability.