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. 2023 Jun 14;13(12):1859.
doi: 10.3390/nano13121859.

Weak Metal-Support Interaction over CuO/TiO2 Catalyst Governed Low-Temperature Toluene Oxidation

Meilin Zou  1 , Mingyue Wang  1 , Jingge Wang  1 , Danrui Zhu  1 , Jiaying Liu  1 , Junwei Wang  1 , Qingchao Xiao  2 , Jianjun Chen  1
Affiliations

Weak Metal-Support Interaction over CuO/TiO2 Catalyst Governed Low-Temperature Toluene Oxidation

Meilin Zou et al. Nanomaterials (Basel). .

Abstract

Regulating the metal-support interaction is essential for obtaining highly efficient catalysts for the catalytic oxidation of volatile organic compounds (VOCs). In this work, CuO-TiO2(coll) and CuO/TiO2(imp) with different metal-support interactions were prepared via colloidal and impregnation methods, respectively. The results demonstrated that CuO/TiO2(imp) has higher low-temperature catalytic activity, with a 50% removal of toluene at 170 °C compared to CuO-TiO2(coll). Additionally, the normalized reaction rate (6.4 × 10-6 mol·g-1·s-1) at 160 °C over CuO/TiO2(imp) was almost four-fold higher than that over CuO-TiO2(coll) (1.5 × 10-6 mol·g-1·s-1), and the apparent activation energy value (27.9 ± 2.9 kJ·mol-1) was lower. Systematic structure and surface analysis results disclosed that abundant Cu2+ active species and numerous small CuO particles were presented over CuO/TiO2(imp). Owing to the weak interaction of CuO and TiO2 in this optimized catalyst, the concentration of reducible oxygen species associated with the superior redox property could be enhanced, thus significantly contributing to its low-temperature catalytic activity for toluene oxidation. This work is helpful in exploring the influence of metal-support interaction on the catalytic oxidation of VOCs and developing low-temperature catalysts for VOCs catalytic oxidation.

Keywords: CuO/TiO2; toluene catalytic oxidation; weak metal–support interaction.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Catalytic activity in terms of toluene conversion of catalysts; (b) normalized reaction rates of samples for toluene catalytic oxidation at 160 °C, 180 °C and 200 °C; (c) Arrhenius plot and (d) stability test of CuO/TiO2(imp) at 240 °C.
Figure 2
Figure 2
(a) N2 adsorption–desorption isotherm and (b) BJH pore-size distributions of samples.
Figure 3
Figure 3
(a) XRD patterns of CuO-TiO2(coll) and CuO/TiO2(imp) catalysts and (b) partially magnified profiles.
Figure 4
Figure 4
(a) Raman spectra of catalysts and (b) partially magnified profiles.
Figure 5
Figure 5
SEM-EDX mapping of Cu over (a,b) CuO-TiO2(coll) and (c,d) CuO/TiO2(imp).
Figure 5
Figure 5
SEM-EDX mapping of Cu over (a,b) CuO-TiO2(coll) and (c,d) CuO/TiO2(imp).
Figure 6
Figure 6
TEM images of (a) CuO-TiO2(coll) and (b) CuO/TiO2(imp) catalysts; grain particle sizes distribution of (c) CuO-TiO2(coll) and (d) CuO/TiO2(imp) catalysts.
Figure 6
Figure 6
TEM images of (a) CuO-TiO2(coll) and (b) CuO/TiO2(imp) catalysts; grain particle sizes distribution of (c) CuO-TiO2(coll) and (d) CuO/TiO2(imp) catalysts.
Figure 7
Figure 7
XPS spectra of catalysts: (a) Cu 2p; (b) partially magnified profile of Cu 2p3/2; (c) partially magnified profile of Cu 2p1/2; (d) O 1s; (e) Ti 2p.
Figure 8
Figure 8
UV-vis spectroscopy of different catalysts.
Figure 9
Figure 9
H2-TPR profiles of samples.
See this image and copyright information in PMC

References

    1. Kamal M.S., Razzak S.A., Hossain M.M. Catalytic oxidation of volatile organic compounds (VOCs)—A review. Atmos. Environ. 2016;140:117–134. doi: 10.1016/j.atmosenv.2016.05.031. - DOI
    1. Atkinson R. Atmospheric chemistry of VOCs and NOx. Atmos. Environ. 2000;34:2063–2101. doi: 10.1016/S1352-2310(99)00460-4. - DOI
    1. Liu H., Liu S., Xue B.R., Lv Z.F., Meng Z.H., Yang X.F., Xue T., Yu Q., He K.B. Ground-level ozone pollution and its health impacts in China. Atmos. Environ. 2018;173:223–230. doi: 10.1016/j.atmosenv.2017.11.014. - DOI
    1. Zhao Q., Li Y.J., Chai X.L., Xu L.Z., Zhang L.F., Ning P., Huang J.H., Tian S.L. Interaction of inhalable volatile organic compounds and pulmonary surfactant: Potential hazards of VOCs exposure to lung. J. Hazard. Mater. 2019;369:512–520. doi: 10.1016/j.jhazmat.2019.01.104. - DOI - PubMed
    1. Zhou G., Lan H., Yang X., Du Q., Xie H., Fu M. Effects of the structure of Ce-Cu catalysts on the catalytic combustion of toluene in air. Ceram. Int. 2013;39:3677–3683. doi: 10.1016/j.ceramint.2012.10.199. - DOI

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