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05. Micro- and Nano-Scale Transport, MEMS

Synthesis of manganese substituted zeolite with Na-P1 framework

Transition metal-doped zeolites have garnered significant interest due to their innovative catalytic applications in oxidation reactions such as the oxidation of benzene to phenol, methane to methanol, and the catalytic decomposition of NO and N2O. These zeolites are created by incorporating transition metal ions such as Fe, Co, Ni, Cu, Ti, and V into their structures, employing both dry solid-phase and hydrothermal methods. Despite the broad research on various transition metals, studies focusing on the structure, catalytic, and redox properties of manganese-containing zeolites remain limited. Furthermore, simplified synthesis methods for these materials have been scarcely explored. Thus, this study aims to synthesize manganese-containing zeolites using a straightforward approach and to elucidate their material and catalytic properties. The experimental procedure involved hydrothermal synthesis under mild conditions, notably excluding sodium hydroxide from the mother liquor. This method successfully yielded GIS-type zeolites, specifically Mn-NaP1, characterized by a high degree of manganese substitution within a short synthesis duration. To inhibit the formation of manganese hydroxides and oxides, oxalic acid was incorporated as one of the reactants during synthesis. The resulting Na-P1 zeolite demonstrated a relatively high cation exchange capacity (CEC) value, with its Si/Al ratio being adjustable based on the synthesis conditions. Notably, the synthesis parameters for Na-P1 closely align with those required for high-CEC zeolites such as Linde type A and Faujasite X. Consequently, the findings of this study are expected to significantly advance the synthetic and catalytic research of NaP1 zeolites with substantial manganese substitution. The synthesized zeolites were thoroughly analyzed for their crystal structure and elemental composition using X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), and thermal analysis. Additionally, the catalytic and redox properties of the zeolites were examined by hydrogen gas reduction and the decomposition of NO and N2O.

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Author Information

Mr.
Yu SHINGAI
Corresponding author, Presenting author
Prof.
Shinfuku NOMURA
Prof.
Shinobu MUKASA
Prof.
Junichi NAKAJIMA