High Selectivity to HCl for the Catalytic Removal of 1,2-Dichloroethane Over RuP/3DOM WO_x: Insights into the Effects of P-Doping and H₂O Introduction

Abstract

Ru-based catalysts for catalytic combustion of high-toxicity Cl-containing volatile organic compounds are inclined to produce Cl2 instead of ideal HCl due to the Deacon reaction. We herein reported that the three-dimensionally ordered macroporous (3DOM) WO x -supported RuP nanocatalyst greatly improved HCl selectivity (at 400 °C, increased from 66.0% over Ru/3DOM WO x to 96.4% over RuP/3DOM WO x ) and reduced chlorine-containing byproducts for 1,2-dichloroethane (1,2-DCE) oxidation. P-doping enhanced the number of structural hydroxyl groups and Brønsted acid sites. The isotopic 1,2-DCE temperature-programmed desorption experiment in the presence of H2 18O indicated the generation of a new active oxygen species 16O18O that participated in the reaction. Generally, P-doping and H2O introduction could promote the exchange reaction between Cl and hydroxyl groups, rather than oxygen defects, and then benefit the production of HCl and reduce the generation of other chlorine species or Cl2, via the reaction processes of C2H3Cl → alcohol → aldehyde → carboxylic acids.

Catalytic activity, water resistance and stability of hematite nanomaterials in oxidative removal of polychlorinated aromatic hydrocarbons can be simultaneously enhanced through facet engineering

“…S8 †), corroborating the weaker interaction between NR-{110} and the adsorbed H 2 O. [40][41][42] Overall, the above results indicated that the water resistance of α-Fe 2 O 3 might be controlled by modulating exposed facets to minimize the adsorption affinity of water molecules.…”

Engineering Ru/MnCo3Ox for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H2O and Reaction Mechanism

“…Similarly, doped Ru species in MnCO 3 O x generate more −CH 2 –/–CH–/–CH 3 groups associated with acetaldehyde, acetic acid, and catecholate-type species under humid conditions, which can be quickly converted into CO 2 and H 2 O and expedite the 1,2-DCE destruction. Thus, it can be seen that the promotion or inhibition of H 2 O molecular on the oxidation of 1,2-DCE is directly related to the presence of active species (Mn, Co, and Ru species) and catalytic performance of the catalysts, which can force manipulate the desorption of chlorine species and chlorinated intermediates …”

Atomically dispersed Ru catalysts for polychlorinated aromatic hydrocarbon oxidation

“…7c, the reduction temperature of Ru species (125 °C) in Ru ADCs was comparable with that of 124 °C for Ru NPs (inset figure). 36 However, the reduction temperature for WO X reduction (>700 °C (ref. 36)) in Ru ADCs (705 °C) was significantly lower than that of 713 °C in Ru NPs, suggesting that the reducibility of WO X was enhanced due to the interaction between atomically dispersed Ru and Nb–WO X .…”

“…36 However, the reduction temperature for WO X reduction (>700 °C (ref. 36)) in Ru ADCs (705 °C) was significantly lower than that of 713 °C in Ru NPs, suggesting that the reducibility of WO X was enhanced due to the interaction between atomically dispersed Ru and Nb–WO X . According to previous reports, we have known that Nb–WO X was enriched with oxygen vacancies.…”