Materials, Год журнала: 2025, Номер 18(8), С. 1782 - 1782

Опубликована: Апрель 14, 2025

V0.5/Pt/TiO2 tandem catalysts exhibit both an outstanding low-temperature NH3 conversion rate and high N2 selectivity in NH3-SCO reactions, but the mechanism of remains unclear. In this work, Vx/Pt/TiO2 were synthesized through a two-step impregnation–deposition method. The modulating effect V loading mount on performance was evaluated, relevant reaction explored systematically. results demonstrated that synergistic oxidation NH3-SCR reactions could be regulated by changing amount, thereby selectivity. Compared with other previously reported SCO catalysts, catalyst amount 0.5 wt.% exhibited performance, which achieved complete >90% within range 250–450 °C. XPS, NH3-TPD, O2-TPD suggested increase from 0.1 to conducive increasing relative contents Pt0 V5+ species, as well acid sites, oxygen vacancies. Consequently, significantly enhanced, enabling excellent A further 0.9 would bring about opposite above, resulting decline catalytic performance. situ DRIFTS showed beneficial for -NH2 species participate boosting

Язык: Английский