Synthesis of gold and palladium nanoparticles supported on CuO/rGO using imidazolium ionic liquid for CO oxidation
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Synthesis of gold and palladium nanoparticles supported on CuO/rGO using imidazolium ionic liquid for CO oxidation Mosaed S. Alhumaimess1 · Ibrahim H. Alsohaimi1 · Hamed M. Alshammari2 · Obaid F. Aldosari3,4 · Hassan M. A. Hassan1,5 Received: 15 July 2020 / Accepted: 12 September 2020 © Springer Nature B.V. 2020
Abstract A simple ionic liquid-assisted approach for the fabrication of graphene-based nanocomposite is reported. Pd–CuO/rGO and Au–CuO/rGO nanocomposites are successfully fabricated with the assistance of the ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate. The physicochemical features of nanocomposite are systematically characterized by XRD, FT-IR, Raman spectroscopy, XPS, TGA, FESEM, AFM, and HRTEM. Carbon monoxide has been used as a probe molecule to emphasize the performance of the fabricated materials. The results indicate that the incorporation of a little quantity of ionic liquid results in the creation of uniformly dispersed NPs simultaneously with the reduction of graphene oxide (GO) into rGO, which leads to a low-temperature CO oxidation process. Besides, the Au– CuO/rGO catalyst achieved excellent durability in CO oxidation for 14 h, without detectable deactivation. The low-temperature CO oxidation was mainly induced by the synergistic effects between the components of catalysts. The Au or Pd and CuO combination not only generates more interfaces, which is more favorable for the activation of oxygen but also enhances the catalyst reduction behavior. Consequently, a graphene composite catalyst can be considered a potential CO oxidation candidate. Keywords Ionic liquid · Graphene-based catalyst · CuO · Au–CuO/rGO · Pd–CuO/ rGO · CO oxidation * Mosaed S. Alhumaimess [email protected] 1
Department of Chemistry, College of Science, Jouf University, P.O. Box 2014, Sakaka, Saudi Arabia
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Chemistry Department, Faculty of Science, Ha’il University, P.O. Box 2440, Ha’il, Saudi Arabia
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Department of Chemistry, College of Science and Human Studies At Hautat Sudair, Majmaah University, P.O. Box 66, Majmaah 11952, Saudi Arabia
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Chemistry Department, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, P.O. Box 83, Alkharj 11942, Saudi Arabia
5
Department of Chemistry, Faculty of Science, Suez University, Suez, Egypt
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Introduction Cars are providing people a comfortable life with the fast evolution of the automobile sector and the rapid growth in the number of the vehicle in each country. At the same time, emissions from the car have also caused significant troubles with air pollution, particularly carbon monoxide emissions [1]. Using different catalysts, the conversion of CO to less toxic CO2 is a very pragmatic approach. Noble metal nanoparticles (NPs) play a pivotal role in various chemical processes in a variety of nanocatalysts [2]. Due to their excellent catalytic performance and selectivity, there are always two crucial parameters for potential applications in noble metal nanocatalysts, the higher cost
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