Boosting catalytic stability for VOCs removal by constructing PtCu alloy structure with superior oxygen activation...

Area of Science:

• Environmental Chemistry
• Catalysis Science
• Materials Science

Background:

• Volatile organic compounds (VOCs) from industrial processes, like furniture painting, significantly impact air quality.
• Effective catalytic oxidation is crucial for mitigating VOC pollution.
• Developing catalysts with enhanced stability and efficiency is a key challenge.

Purpose of the Study:

• To investigate the catalytic oxidation of a toluene and iso-hexane mixture, common in furniture paint emissions.
• To enhance the catalytic stability of toluene oxidation using novel catalyst formulations.
• To understand the role of active oxygen species in catalyst performance and stability.

Main Methods:

• Preparation and characterization of Pt/M and Pt-Cu/M catalysts.
• Evaluation of catalytic activity and stability for toluene and iso-hexane oxidation.
• Analysis of reaction mechanisms, including Langmuir-Hinshelwood and Mars-van Krevelen pathways.
• Investigation of oxygen activation and active oxygen species formation.

Main Results:

• The Pt-Cu/M catalyst demonstrated superior VOC adsorption and gaseous oxygen activation compared to Pt/M.
• The Pt-Cu alloy structure influenced the active oxygen species involved in toluene oxidation.
• A combination of Langmuir-Hinshelwood and Mars-van Krevelen mechanisms was observed.
• Pt-Cu/M catalysts showed improved stability, partly due to lattice oxygen replenishment.
• Increased reaction temperature facilitated the oxidation of weakly adsorbed iso-hexane, maintaining catalyst stability.

Conclusions:

• A promising Pt-Cu/M catalyst was developed for the catalytic removal of VOCs from the furniture paint industry.
• The study provides a new strategy for generating active oxygen species, enhancing catalyst stability.
• The findings contribute to developing more stable and efficient catalysts for industrial VOC abatement.