Low-temperature oxidative removal of benzene from the air using titanium carbide (MXene)-Supported platinum catalysts

Chemosphere. 2024 Feb:350:141114. doi: 10.1016/j.chemosphere.2024.141114. Epub 2024 Jan 4.

Abstract

MXenes are an emerging class of two-dimensional (2D) inorganic materials with great potential for versatile applications such as adsorption and catalysis. Here, we describe the synthesis of a platinized titanium carbide MXene (Pt@Ti3C2) catalyst with varying amounts of platinum (0.1%-2 wt.%) for the low-temperature oxidation of benzene, an aromatic volatile organic compound often found in industrial flue gas. A 1% formulation of Pt@Ti3C2-R allowed near-complete (97%) oxidation of benzene to CO2 at 225 °C with a steady-state reaction rate (r) of 0.119 mol g-1·h-1. This low-temperature catalytic oxidation reaction was promoted by an increase in the lattice oxygen (O*)/Pt2+ species (active sites) of 1%Pt@Ti3C2-R from 45.3/34.6% to 71.0/61.1% through pre-thermal reduction under H2 flow, as revealed by X-ray photoelectron spectroscopy, temperature-programmed reduction, and in situ diffuse reflectance infrared Fourier transform spectroscopy analyses. The cataltyic activity of 1% Pt@Ti3C2-R against benzene was assessed under the control of the key process variables (e.g., catalyst mass, flow rate, benzene concentration, relative humidity, and time-on-stream) to help optimize the oxidation reaction process. The results provide new insights into the use of platinum-based 2D MXene catalysts for low-temperature oxidative removal of benzene from the air.

Keywords: Air pollution control; Benzene; Catalytic oxidation; MXenes; Thermodynamics; VOCs.

MeSH terms

  • Benzene* / chemistry
  • Catalysis
  • Nitrites*
  • Oxidation-Reduction
  • Oxidative Stress
  • Platinum* / chemistry
  • Temperature
  • Titanium / chemistry
  • Transition Elements*

Substances

  • Benzene
  • titanium carbide
  • Platinum
  • MXene
  • Titanium
  • Nitrites
  • Transition Elements