Nickel foam supported CuCe mixed metal oxide as monolith catalyst for NO removal

NO reduction by CO had been widely studied for powder catalysts. In this paper, nickel foam (NF) was used as supporter and millimeter-scale molding CuCe metal oxide catalyst was prepared for NO reduction by CO without traditional molding process such as coating, extrusion and 3D printing. Porous nickel foam provided more active sites and had certain mechanical strength. The result showed that CuCe/NF catalyst had good denitrification activity, and CO + NO were all removed at 200 °C. The suitable conditions for CuCe/NF catalyst were calcination temperature of 400 °C and space speed of 25000 h−1. The presence of Cu inhibited particle agglomeration and improves the adsorption capacity of Cu+ to CO. In addition, it can also promote the concentration of Ce3+ ions, and the CuCe bimetallic synergism facilitated the catalytic reduction pair cycle. In situ infrared spectroscopy showed that the catalyst had different reaction paths at different temperatures, and the mixed oxide DFT model further verified our hypothesis that low temperature (100 ∼ 150 °C) followed E-R mechanism and high temperature (≥150 °C) followed L-H mechanism.