Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 310, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121240
Keywords
2-chloroethane; Molybdenum; Ceria; Chlorination; Catalytic combustion
Funding
- National Natural Science Foun-dation of China [21976056, 21777043, 21922602]
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MoOx/CeO2 catalysts with different forms of MoOx on CeO2 were prepared for the catalytic oxidation of 1,2-dichloroethane. The acidity and surface oxygen from CeO2 domain play important roles in the activity of the catalysts.
MoOx/CeO2 catalysts prepared by impregnation with (NH4)(6)H8Mo7O28 aqueous solution were applied for catalytic oxidation of 1,2-dichloroethane. MoOx exists on CeO2 fluorite as isolated (O=)(2)Mo(O-Ce)(2), poly MoO4 and nano-particles, of which (O=)(2)Mo(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 T-90 of 280 degrees 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=)(2)Mo(O-Ce)(2) for water dissociation promotes Cl removal, and thus, the chlorination is inhibited completely within experiment temperature. Mo6+=O of (O=)(2)Mo(O-Ce)(2) is highly stable in wet feed, leading to high resistance of MoOx/CeO2 catalysts to water.
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