Enhanced NOx removal efficiency for SCR catalyst of well-dispersed Mn-Ce nanoparticles on hexagonal boron nitride

Lee, Myeung-jin; Kim, Do-Hyun; Lee, Minwoo; Ye, Bora; Jeong, Bora; Lee, DuckHyun; Kim, Hong-dae; Lee, Heesoo

Enhanced NOx removal efficiency for SCR catalyst of well-dispersed Mn-Ce nanoparticles on hexagonal boron nitride

2019

This research is conducted to improve the dispersion of MnOₓ–CeO₂ catalyst because manganese is easily aggregated during continuous thermal environment at operating temperature. Aggregated MnOₓ particles on the support can be a major reason to degrade the catalyst performance. Therefore, the improved dispersion of MnOₓ particles leads to the enhancement of the catalyst performance by utilizing hexagonal boron nitride (h-BN) which is well known as thermally stable material. Due to the dispersion of MnOₓ–CeO₂ with 5–20 nm particle size, h-BN-supported MnOₓ–CeO₂ catalyst shows the 93% efficiency in NOₓ removal at 200 °C. The structure and properties of MnOₓ–CeO₂/h-BN catalyst are characterized by X-ray diffraction, Fourier transform infrared spectroscopy spectra, and NH₃-temperature programmed desorption. Then, NOₓ removal efficiency of catalyst is evaluated on a fixed bed reactor and h-BN-supported catalyst, (Mn₀.₂–Ce₀.₁)/BN, increases NOₓ removal efficiency up to 20% at 200 °C in spite of 2/3 reduced content of MnOₓ–CeO₂ compared to no-supported catalyst (Mn₀.₃–Ce₀.₁₅).

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