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Effect of modified CeO2 on the performance of PdCu/Ce1−xTixO2 catalyst for methanol purification

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Abstract

In this paper, we prepared a series of Ce1-xTixO2 (x = 0–0.20) nanorods by hydrothermal method, which were used to construct the PdCu/Ce1−xTixO2 catalysts. The Ce1−xTixO2 and PdCu/Ce1−xTixO2 samples were characterized by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometer (ICP-OES), etc. Catalytic activity, stability, and repeatability of the catalysts for methanol oxidation were investigated. The results show that doping a proper amount of titanium could strengthen the interaction between Ce1−xTixO2 support and PdCu nanoalloy, thus increasing the oxygen vacancy concentration and promoting Pd species with a higher oxidation state. These modified properties are beneficial for the deep oxidation of methanol. The light-off temperature (T50) and full-conversion temperature (T90) of methanol over the PdCu/CeO2 catalyst are 108 °C and 159 °C, respectively. The greatest activity improvement is found for PdCu/Ce0.9Ti0.1O2, which shows the lowest T50 of 88 °C and T90 of 138 °C. Furthermore, neither PdCu/CeO2 nor the modified PdCu/CeO2 catalyst produces by-products and exhibit excellent stability and repeatability throughout the whole test period. This study provides a reference for in-depth understanding and designing of efficient and stable CeO2-based oxidation catalysts.

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We declare that all the data supporting the results of this paper were generated during this study.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 21773189), the Project of Department of Science and Technology of Sichuan Province (No. 19ZDZX0113), the Central Government Funds of Guiding Local Scientific and Technological Development for Sichuan Province (No. 2021ZYD0044) and the Science Research Starting Project of SWPU (No. 2021QHZ023).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China

    Zhangjie Li, Yongdong Chen, Jie Deng, Li Luo, Wenxiang Gao & Liang Yuan

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  1. Zhangjie Li
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  2. Yongdong Chen
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  3. Jie Deng
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  4. Li Luo
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  5. Wenxiang Gao
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Contributions

Zhangjie Li: writing—original draft preparation; data curation; catalyst activity tests.

Yongdong Chen: writing—reviewing and editing.

Jie Deng: writing—reviewing and editing.

Li Luo: writing—reviewing and editing.

Wenxiang Gao: writing—reviewing and editing.

Liang Yuan: writing—reviewing and editing.

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Correspondence to Yongdong Chen.

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Li, Z., Chen, Y., Deng, J. et al. Effect of modified CeO2 on the performance of PdCu/Ce1−xTixO2 catalyst for methanol purification. Environ Sci Pollut Res 29, 73935–73945 (2022). https://doi.org/10.1007/s11356-022-20535-0

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