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Open AccessArticle

Preparation of Pd/C by Atmospheric-Pressure Ethanol Cold Plasma and Its Preparation Mechanism

College of Physical Science and Technology, Dalian University, Dalian 116622, China
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Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1437; https://doi.org/10.3390/nano9101437
Received: 19 September 2019 / Revised: 1 October 2019 / Accepted: 3 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Nanocatalysts in Chemistry: Synthesis and Applications)
Treatment with atmospheric-pressure (AP) hydrogen cold plasma is an effective method for preparing highly active supported metal catalytic materials. However, this technique typically uses H2 as working gas, which is explosive and difficult to transport. This study proposes the use of PdCl2 as a Pd precursor and activated carbon as the support to fabricate Pd/C catalytic materials (Pd/C-EP-Ar) by using ethanol—which is renewable, easily stored, and safe—combined with AP cold plasma (AP ethanol cold plasma) followed by calcination in Ar gas at 550 °C for 2 h. Both Pd/C-EP and Pd/C-HP fabricated using AP ethanol and hydrogen cold plasma (without calcination in Ar gas) respectively, exhibit low CO oxidation reactivity. The activity of Pd/C-EP is lower than Pd/C-HP, which is mainly ascribed to the carbon layer formed by ethanol decomposition during plasma treatment. However, the 100% CO conversion temperature (T100) of Pd/C-EP-Ar is 140 °C, which is similar to that of Pd/C-HP-Ar fabricated using AP hydrogen cold plasma (calcined in Ar gas at 550 °C for 2 h). The characterization results of X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy indicated that the carbon layer formed by ethanol decomposition enhanced the interaction of metal nanoparticles to the support, and a high Pd/C atomic ratio was obtained. This was beneficial to the high CO oxidation performance. This work provides a safe method for synthesizing high-performance Pd/C catalytic materials avoiding the use of H2, which is explosive and difficult to transport. View Full-Text
Keywords: ethanol cold plasma; hydrogen cold plasma; Pd/C; CO oxidation; preparation mechanism ethanol cold plasma; hydrogen cold plasma; Pd/C; CO oxidation; preparation mechanism
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MDPI and ACS Style

Li, Z.; Zhang, J.; Wang, H.; Li, Z.; Zhang, X.; Di, L. Preparation of Pd/C by Atmospheric-Pressure Ethanol Cold Plasma and Its Preparation Mechanism. Nanomaterials 2019, 9, 1437.

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