Catalytic combustion of CVOCs over MoOx/CeO2 catalysts

MoOx/CeO2 catalysts prepared by impregnation with (NH4)6H8Mo7O28 aqueous solution were applied for catalytic oxidation of 1,2-dichloroethane. MoOx exists on CeO2 fluorite as isolated (O=)2Mo(O-Ce)2, poly MoO4 and nano-particles, of which (O=)2Mo(O-Ce)2 presents high acidity and reducibility of Mo, a...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2022-08, Vol.310, p.121240, Article 121240
Main Authors: Zhang, Hao, Gao, Xiaohui, Gong, Binwei, Shao, Shijie, Tu, Chensheng, Pan, Jun, Wang, Yangyang, Dai, Qiguang, Guo, Yanglong, Wang, Xingyi
Format: Article
Language:English
Subjects:
1,2-chloroethane
Acidity
Aqueous solutions
Basicity
Catalysts
Catalytic combustion
Catalytic oxidation
Ceria
Cerium oxides
Chlorination
Dichloroethane
Fluorite
High resistance
Molybdenum
Nanoparticles
Oxidation
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Summary:MoOx/CeO2 catalysts prepared by impregnation with (NH4)6H8Mo7O28 aqueous solution were applied for catalytic oxidation of 1,2-dichloroethane. MoOx exists on CeO2 fluorite as isolated (O=)2Mo(O-Ce)2, poly MoO4 and nano-particles, of which (O=)2Mo(O-Ce)2 presents high acidity and reducibility of Mo, and decreases the basicity of CeO2, leading to the formation of reactive intermediate during 1,2-dichloroethane adsorption. The activity of MoOx/CeO2 catalysts for 1,2-dichloroethane oxidation increases with acidity and surface oxygen from CeO2 domain. The catalyst with 2.6 Mo atom nm−2 presents the highest apparent activity with T90 of 280 °C in feed containing 1000/2000 ppm 1,2-dichloroethane at 60,000 h−1 space velocity. For chlorinated aromatic oxidation, similar high stable activity is observed. The ability of (O=)2Mo(O-Ce)2 for water dissociation promotes Cl removal, and thus, the chlorination is inhibited completely within experiment temperature. Mo6+=O of (O=)2Mo(O-Ce)2 is highly stable in wet feed, leading to high resistance of MoOx/CeO2 catalysts to water. [Display omitted] •MoOx/CeO2 catalysts with various loadings of MoOx were prepared by wet impregnation.•MoOx is identified as forms of isolated (O=)2Mo(O-Ce)2, poly MoO4 and nanoparticle.•(O=)2Mo(O-Ce)2 promotes the reducibility and acidity of MoOx/CeO2 catalysts.•Catalysts with (O=)2Mo(O-Ce)2 are active and stable in 1,2-dichloroethene oxidation.•No chlorination is observed over MoOx/CeO2 catalysts with 2.6 Mo atom nm−2 or higher.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2022.121240