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Preparation of Pd–Au/TiO2–WO3 to enhance photoreduction of CO2 to CH4 and CO
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2018-10-16 , DOI: 10.1016/j.jcou.2018.10.006
Zhen Zhu , Wei-Ru Huang , Chin-Yuan Chen , Ren-Jang Wu

In this study, Pd–Au/TiO2–WO3 nanoparticles were successfully prepared using a hydrothermal and sol-gel route and applied to the photoreduction of CO2 under UV visible-light irradiation. The synthesized Pd–Au/TiO2–WO3 nanoparticles were characterized using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area measurement, ultraviolet–visible absorption spectrophotometry, and photoluminescence analysis. The experimental results showed that Pd–Au/TiO2–WO3 nanoparticles with the appropriate amounts of Pd and Au achieved the highest activity for CO2 photoreduction. Among the synthesized Pd–Au/TiO2-WO3 nanoparticles, the highest production rates of CH4 and CO, 39.1 μmol g−1 h−1 and 271.3 μmol g−1 h−1, respectively, were observed with 0.5 wt%Pd-0.1 wt%Au/TiO2-WO3, manifesting a significant 247-fold enhancement of CO yield over TiO2. Moreover, 0.5 wt%Pd-0.1 wt%Au/TiO2-WO3 exhibited a 43-fold higher CH4 production rate than did TiO2 alone. This might be attributed to the increased specific surface area (72.9 m2 g−1) and the low recombination rate of photogenerated electron-hole pairs. Based on the results, a plausible mechanism for CO2 photoreduction that uses synthesized Pd–Au/TiO2–WO3 is discussed in this paper. This study demonstrated that Pd–Au/TiO2–WO3 is a promising candidate for the development of an efficient photocatalyst for CO2 photoreduction under solar light irradiation.



中文翻译:

制备Pd–Au / TiO 2 –WO 3以增强CO 2向CH 4和CO的光还原

在这项研究中,成功地使用水热和溶胶-凝胶法制备了Pd–Au / TiO 2 –WO 3纳米颗粒,并将其应用于UV可见光照射下的CO 2的光还原。使用X射线衍射,透射电子显微镜,X射线光电子能谱,Brunauer-Emmett-Teller表面积测量,紫外-可见吸收分光光度法和光致发光分析对合成的Pd-Au / TiO 2 -WO 3纳米粒子进行了表征。实验结果表明,适量的Pd和Au的Pd–Au / TiO 2 –WO 3纳米颗粒具有最高的CO 2活性。光还原。在合成的Pd–Au / TiO 2 -WO 3纳米粒子中,CH 4和CO的最高生产率分别为0.5 wt%,39.1μmolg -1  h -1和271.3μmolg -1  h -1。 Pd-0.1 wt%Au / TiO 2 -WO 3表现出CO产量比TiO 2显着提高247倍。此外,与单独的TiO 2相比,0.5wt%的Pd-0.1wt%的Au / TiO 2 -WO 3表现出高43倍的CH 4生产率。这可能是由于比表面积增加(72.9 m 2g -1)和光生电子-空穴对的低复合率。根据结果​​,本文讨论了使用合成的Pd–Au / TiO 2 –WO 3进行CO 2光还原的合理机理。这项研究表明,Pd–Au / TiO 2 –WO 3是开发在太阳光照射下有效还原CO 2的有效光催化剂的有希望的候选者。

更新日期:2018-10-16
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