Confinement effect of Mn nanoparticles encapsulated in zeolite for efficient catalytic ozonation of S-VOCs at room temperature

Catalytic ozonation is potential to eliminate sulfur -containing organic compounds (S-VOCs) with anti -poisoning of sulfur at low temperature. This paper synthesized a popcorn -like catalyst Mn@ZSM293 with confined effect that could combine with ozone to attain 100% conversion of CH3SH at low temperature, ca. 15 degrees C, with a low O3/CH3SH molar ratio of 1.33. Particularly, excellent stability without sulfur poisoning and good water resistance were observed. By contrast, Mn/ZSM293 exhibited agglomeration of Mn nanoparticles that displayed only 70% conversion at same condition and suffered deactivation. Mn@ZSM293 possessed the structures with welldefined large internal voids and surface etchings, which promoted metal -support interaction. The confined effects also brought more oxygen vacancies, larger surface area and pore size, as well as stronger acidity. These properties were favorable for CH3SH adsorption, activation and breakage of C -C and C -S bonds. CH3S-, CH3SO3-, SO42- , and HCOO- based compounds were detected as the critical products by in -situ measurement.