Confinement and synergy effect of bimetallic Pt-Mn nanoparticles encapsulated in ZSM-5 zeolite with superior performance for acetone catalytic oxidation

• Published in: Applied catalysis. B, Environmental Vol. 309; p. 121224
• Main Authors: Yang, Lizhe, Liu, Qingling, Han, Rui, Fu, Kaixuan, Su, Yun, Zheng, Yanfei, Wu, Xueqian, Song, Chunfeng, Ji, Na, Lu, Xuebin, Ma, Degang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.07.2022; Elsevier BV
• Subjects: Acetic acid; Acetone; Bimetal; Bimetals; Carbon dioxide; Catalyst; Catalysts; Catalytic activity; Catalytic oxidation; Chemical synthesis; Confinement; Dichloromethane; Durability; Ethyl acetate; Nanoparticles; Oxidation; Toluene; VOCs; VOCs oxidation; Volatile organic compounds; Water resistance; Zeolite; Zeolites; VOCs oxidation; Confinement; Zeolite; Catalyst; Bimetal
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2022.121224

Catalytic oxidation is one of the most promising methods to remove VOCs. Herein, a zeolite-confined PtMn bimetal catalyst (PtMn0.2 @ZSM5) was synthesized using a ligand-assisted hydrothermal method, which showed extraordinary catalytic activity with a T95 of 165 ℃ for the acetone oxidation in the presence of 5 vol% water. Thanks to the zeolite confinement and bimetallic synergy effect, the PtMn0.2 @ZSM5 exhibited small nanoparticle sizes, abundant acid sites, higher active Pt0 content, and sufficient active oxygen species. These excellent properties promoted the adsorption of VOC, the deep oxidation of VOC, and the desorption of CO2. In-situ DRIFTS proposed an L-H mechanism for acetone oxidation over PtMn0.2 @ZSM5. Significantly, the PtMn0.2 @ZSM5 presented good durability and water resistance under high GHSV conditions. Also, it was confirmed effective for various VOCs oxidation, such as toluene, ethyl acetate, propane, and dichloromethane, showing a promising industrial prospect for eliminating VOCs. [Display omitted] •A zeolite-confined PtMn0.2@ZSM5 catalyst was successfully synthesized.•The PtMn0.2@ZSM5 showed excellent catalytic performance for VOCs oxidation.•Zeolite confinement effect and Pt-Mn synergy effect was verified to be the keys.•An L-H mechanism for acetone oxidation over PtMn0.2@ZSM5 was proposed.