Mn-containing NaP1-type zeolites with high manganese substitution ratios were synthesized using a hydrothermal synthesis method. The synthesis procedure, structural evaluation, and catalytic properties of the resulting materials were investigated in detail. The synthesis was carried out by mixing water glass with pure water, sodium aluminate with pure water, and a solution containing oxalic acid, aluminum nitrate, and manganese acetate. These mixtures were vigorously stirred and heated. After the heating process, the product was washed with pure water and dried to obtain the desired NaP1-type zeolite. The resulting NaP1-type zeolite exhibited a high cation exchange capacity (CEC), and its Si/Al ratio could be adjusted depending on the synthesis conditions. The structural features and elemental distribution of the synthesized zeolite were thoroughly evaluated using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FT-IR). The decomposition behavior of N₂O was measured, revealing that higher manganese substitution ratios led to improved decomposition performance of nitrogen oxides. This suggests the potential of this material as an effective environmental purification catalyst.
WATANABE et al. (Wed,) studied this question.