Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 304, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.121002
Keywords
2-dichloroethane; Catalytic selectivity; Stability; Reaction mechanism
Funding
- National Natural Science Foundation of China [21922606, 21876139]
- Shaanxi Natural Science Fundamental Shaanxi Coal Chemical Joint Fund [2019JLM-14]
- K.C. Wong Education Foundation
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A Cr-modified RuO2/TiO2 catalyst was fabricated and showed enhanced activity and selectivity for 1,2-dichloroethane decomposition. The presence of Cr2O3 improved the Lewis acid sites concentration and redox ability of RuO2/TiO2, promoting the deep destruction of 1,2-DCE and inhibiting the formation of byproducts. This catalyst exhibited excellent durability under simulated conditions and can be a promising candidate for industrial CVOC catalytic degradation.
Ru-based catalysts with increased attention for CVOC purification still have huge challenges in promoting their low-temperature activity and durability. Here, a Cr-modified RuO2/TiO2 catalyst was fabricated and employed for 1,2-dichloroethane (1,2-DCE) destruction. The synergy of Cr2O3 and RuO2/TiO2 enhances the exposure of surface Ru, generating abundant reducible Cr6+ and Ru4+ species and chemically adsorbed oxygen, which promote the activity and CO2/HCl selectivity in 1,2-DCE decomposition evidently. 1,2-DCE primarily activates on the Lewis acid sites (LAS) over RuO2/Cr2O3 /TiO2 with C-Cl cleavage. Meanwhile, C-C cleavage occurs along with the dehydrochlorination and chlorination reactions. The presence of Cr2O3 greatly improves the LAS concentration and redox ability of RuO2/TiO2, accelerating the deep destruction of 1,2-DCE and inhibiting the formation of CH2Cl2, C2HCl3 and CHCl3. Cr species with superior chlorine resistance elevate the durability of RuO2/Cr2O3 /TiO2 under simulated conditions toward H2O, SO2, and chlorine species, making it a promising candidate for industrial CVOC catalytic degradation.
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