[1E04-06] International sess. 2

[1E04] Role of acid sites for selective catalytic oxidation of NH₃: the case of niobium oxide supported precious metals catalysts

○Mingyue Lin¹, Baoxiang An¹, Takashi Takei¹, Tetsuya Shishido¹, Tamao Ishida¹, Masatake Haruta¹, Toru Murayama^1,2 (1. Tokyo Metropolitan University, 2. Yantai University)

Ammonia is a strong odor that has negative impacts on human health and the environment. Selective catalytic oxidation (SCO) of NH₃ is an ideal method for its removal due to its environmental-friendly products of N₂ and H₂O. However, the developed catalysts either need high reaction temperatures or suffer the second pollution of the byproduct of N₂O. Thus, the development of low-temperature effective catalyst that exhibits high N₂ selectivity is very necessary. In this work, niobium oxide with a deformed orthorhombic structure was synthesized as the acidic metal oxide support for precious metals (Pt, Pd, and Au) for NH₃-SCO. High levels of N₂ selectivity (>95% at full conversion) were obtained in this study. The role of acid sites in improving N₂ selectivity was investigated. This study will provide a new concept for the design of catalyst for NH₃-SCO with high N₂ selectivity.