Template-free synthesis of mesoporous X–Mn (X = Co, Ni, Zn) bimetal oxides and catalytic application in the room temperature removal of low-concentration NO

Authors:
Publisher website
Google Scholar
Abstract
Three types of Mn-based bimetal oxides (Co–Mn, Ni–Mn and Zn–Mn oxides) with well-defined mesoporosities and high specific surface areas were facilely synthesized by a template-free strategy of decomposing self-made single-phase bimetal oxalate. These bimetal oxides, featuring tunable compositions (spinel manganates) and a mesoporous structure, were applied for the first time in the room temperature catalytic removal of low-concentration (10 ppm) NO, a concerning pollutant in road tunnels and indoor parks. They demonstrated substantially enhanced efficiencies in NO removal as compared with corresponding single-metal oxides (MnOx, Co3O4, NiO, ZnO), and complete conversion in up to 1.8 h at an extraordinarily high space velocity of 120 000 mL g−1 h−1 was achieved, which was proposed to be a result of not only the spinel manganates but also the oxygen vacancies in the amorphous Co (or Ni, Zn)-doped MnOx framework. NO was revealed to be catalytically oxidized into NO2 and then fixed in the bimetal oxides by forming nitrite and nitrate species.

This publication has 45 references indexed in Scilit: