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. 2023 Nov 20;8(48):45474-45482.
doi: 10.1021/acsomega.3c05175. eCollection 2023 Dec 5.

Cerium-Doped CuFe-Layered Catalyst for the Enhanced Oxidation of o-Xylene and N, N-Dimethylacetamide: Insights into the Effects of Temperature and Space Velocity

Zehra Betul Ocal  1   2 , Ramazan Keyikoglu  1   3 , Ahmet Karagunduz  1 , Yeojoon Yoon  4 , Alireza Khataee  1   5
Affiliations

Cerium-Doped CuFe-Layered Catalyst for the Enhanced Oxidation of o-Xylene and N, N-Dimethylacetamide: Insights into the Effects of Temperature and Space Velocity

Zehra Betul Ocal et al. ACS Omega. .

Abstract

Volatile organic compounds (VOCs) are among the most potential pollutant groups that cause air quality degradation because of their toxic effects on human health. Although catalytic oxidation is an effective method for VOC removal, further studies are required to develop more efficient and affordable catalysts. In this study, cerium (Ce) was doped into a CuFe-layered material (Ce-CuFe) to improve the catalytic oxidation efficiencies of N,N-dimethylacetamide (DMAC) and o-xylene. The synthesized catalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analysis. XRD analysis confirmed the successful doping of Ce atoms into the CuFe-layered structure, while in the SEM and TEM images the catalyst appeared as uniformly distributed two-dimensional plate-like particles. The catalytic oxidation performance of the Ce-CuFe was investigated at six temperatures between 200 and 450 °C and three space velocities in the range of 31000-155000 mLh-1g-1 for the oxidation of DMAC and o-xylene, which functioned as polar and nonpolar solvents, respectively. At 200 °C, the Ce-CuFe catalyst performed 50% greater when oxidizing o-xylene while exhibiting a DMAC oxidation efficiency that was 42% greater than that achieved using undoped CuFe. The Ce-CuFe could remove DMAC and o-xylene with an efficiency higher than 95% at 450 °C. Furthermore, Ce-doped CuFe exhibited high resistance against moisture and outstanding reusability performance with only a 5.6% efficiency loss after nine reuse cycles. Overall, the incorporation of Ce into a CuFe-layered material is a promising strategy for the oxidation of various VOCs.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Experimental setup for catalytic oxidation of N,N-dimethylacetamide (DMAC) and o-xylene in the presence of Ce-doped CuFe and CuFe (the Figure was partly generated using Servier Medical Art, provided by Servier, licensed under a Creative Commons Attribution 3.0 unported license).
Figure 2
Figure 2
(a, b) Scanning electron microscopy (SEM) and (c, d) high-resolution transmission electron microscopy (TEM) images of Ce–CuFe.
Figure 3
Figure 3
(a) X-ray diffraction (XRD), (b) energy-dispersive spectroscopy, (c) X-ray photoelectron spectroscopy (XPS), and (d) Fourier-transform infrared (FTIR) analyses of the Ce–CuFe catalyst.
Figure 4
Figure 4
Effect of temperature on the catalytic oxidation of (a) o-xylene and (b) N,N-dimethylacetamide (DMAC) by the Ce–CuFe catalyst at different space velocities.
Figure 5
Figure 5
Performance comparison of CuFe and Ce–CuFe catalyst on the catalytic oxidation of (a) o-xylene (WHSV = 31000 mLh–1g–1) and (b) DMAC (WHSV = 155000 mLh–1g–1) at different temperatures.
Figure 6
Figure 6
Effect of humidity on the catalytic oxidation of N,N-dimethylacetamide (DMAC) by Ce–CuFe oxidation at WHSV = 155000 mLh–1g–1.
Figure 7
Figure 7
(a) Reusability Ce–CuFe catalyst in the catalytic oxidation of DMAC, (b) XRD profile, and (c, d) SEM images of the Ce–CuFe after the ninth use. Experimental conditions: WHSV = 155000 mLh–1g–1 and temperature = 300 °C, reaction duration= 6 h).
See this image and copyright information in PMC

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