Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Abstract

Ru catalysts have attracted increasing attention in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). However, the development of Ru catalysts with high activity and thermal stability for CVOC oxidation still poses significant challenges due to their restrictive relationship. Herein, a strategy for constructing surface defects on Co3O4 support by acid etching was utilized to strengthen the interaction between active RuO x species and the Co3O4 support. Consequently, both the dispersity and thermal stability of RuO x species were significantly improved, achieving both high activity and stability of Ru catalysts for CVOC oxidation. The optimized Ru catalyst on the HF-etched Co3O4 support (Ru/Co3O4-F) achieved complete oxidation of vinyl chloride at 260 °C under 30 000 mL·g–1·h–1, which was lower than 300 °C for the Ru catalyst on the original Co3O4 (Ru/Co3O4). More importantly, the Ru species on the Ru/Co3O4-F catalyst were hardly lost after calcination at 500–700 °C and even reacting at 650 °C for 120 h. On this basis, the polychlorinated byproducts over the Ru/Co3O4-F catalyst were almost completely effaced by phosphate modification on the catalyst surface. These findings show that the method combining acid etching of the support and phosphate modification provides a strategy for the advancement of catalyst design for CVOC oxidation.

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

“…Among all of the catalysts utilized in the oxidation of CVOCs, the supported Ru nanoparticles (NPs) have been proven as a kind of promising catalysts because of their good performance and stability. ,− Ru NPs exhibit high activity due to their strong redox ability. The oxidation of CVOCs is usually accompanied by the Deacon reaction (HCl + O 2 ⇔ H 2 O + Cl 2 ) and thus result in the transformation of organochlorine to Cl 2 .…”

A Cu(ii) complex supported on Fe3O4@SiO2 as a magnetic heterogeneous catalyst for the reduction of environmental pollutants

“…38,39 One of the most signicant routes of chemical industry improvement is the development of novel effective approaches for the synthesis of catalysts. [38][39][40][41] Among other methods to reduce nitro compounds, the catalytic reduction is considered as an appropriate and renewable technique to eliminate nitro compounds and organic dyes because this method has many advantages such as simple work-up, excellent efficiency, costeffectiveness, and safety. 38,39,[42][43][44][45] For the reduction of organic dyes and nitro compounds, it is very necessary to synthesize appropriate and efficient catalysts.…”

Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

“…On the other hand, the efficient and stable attachment of QDs to noble metals is still challenging due to their weak interactions in general. [22][23][24] In addition, the decoration of noble metals with QDs usually leads to excessive loading and the low utilization of noble metals. To overcome these disadvantages, a suitable porous support should be employed, 25 so that the ratio of noble metal to QDs can be varied over a wide range on the surface of the support.…”