Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Abstract

Adjusting the structure and surface profiles of CeO2 could significantly modify its catalytic performance for CVOCs.

Silica‐Confined Ru Species Highly Dispersed on the Porous Ce‐Modified ZrO2 Matrix with Different Redox and Acidity Properties for the Catalytic Combustion of 1,2‐Dichloroethane

“…As the HCl product was easily converted to Cl 2 by Deacon reaction over Ru‐based catalysts, especially at high temperature, the HCl selectivity decreased. The RuO 2 @Ce 0.1 Zr 0.9 O 2 −SiO 2 catalyst showed relatively low HCl selectivity among all the catalysts, which was attributed to the strong redox properties [12,35] . Except for HCl and Cl 2 , several chlorinated byproducts were also detected at the outlet, such as vinyl chloride (VC) and dichloroethylene (Figure 7(d)).…”

“…The RuO 2 @Ce 0.1 Zr 0.9 O 2 À SiO 2 catalyst showed relatively low HCl selectivity among all the catalysts, which was attributed to the strong redox properties. [12,35] Except for HCl and Cl 2 , several chlorinated byproducts were also detected at the outlet, such as vinyl chloride (VC) and dichloroethylene (Figure 7(d)). VC was the intermediate, which formed by the dehydrochlorination of DCE on the Lewis acid sites and was first observed at about 200 °C.…”

“…[31] The redox ability of catalysts could rapidly remove the inorganic chlorine species adsorbed on the active sites in the form of Cl 2 to avoid catalyst poisoning via the Deacon reaction and facilitate the deep oxidation of intermediate. [12,37] Cerium oxide (CeO 2 ) catalyst has attracted intensive interest due to its high oxygenstorage capacity and facile cycle of Ce 4 + /Ce 3 + . However, CeO 2 also exhibits inevitable rapid deactivation relating to its easy redissociation and the strong adsorption of inorganic chlorine species (ICs) on the active sites, which could be solved through doping with transition metals or Ru species.…”

“…[11] The HCl formed by the dehydrochlorination reaction of DCE was easily converted into Cl 2 via the Deacon reaction (4HCl + O 2 !2H 2 O + 2Cl 2 ) on the surface of Ru species at high temperature. [12,13] Ru-based catalysts have outstood stability by limiting chlorination and enhancing the HCl-and Cl 2 -resistance ability. [14] However, Rubased catalysts have many deficiencies, such as easy deactivation and high cost.…”

“…Ru‐based catalysts possess high activity for oxidation‐reduction reaction and superior resistance to poisoning by Cl species [11] . The HCl formed by the dehydrochlorination reaction of DCE was easily converted into Cl 2 via the Deacon reaction (4HCl+O 2 →2H 2 O+2Cl 2 ) on the surface of Ru species at high temperature [12,13] . Ru‐based catalysts have outstood stability by limiting chlorination and enhancing the HCl‐ and Cl 2 ‐resistance ability [14] .…”