标题：Ultrafine PtRu nanoparticles confined in hierarchically porous carbon derived from micro-mesoporous zeolite for enhanced nitroarenes reduction performance
作者：Gao, Daowei; Li, Shuna; Wang, Xilong; Xi, Lifei; Lang, Kathrin M.; Ma, Xinlong; Lv, Yipin; Yang, Shaohan; Zhao, Kaixuan; Loussala, H 更多 作者机构：[Gao, Daowei; Li, Shuna; Lv, Yipin; Yang, Shaohan; Loussala, Herman M.; Chen, Guozhu] Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, People 更多
通讯作者：Zhang, Xin;Chen, GZ;Zhang, X
通讯作者地址：[Chen, GZ]Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China;[Zhang, X]China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 1 更多
来源：JOURNAL OF CATALYSIS
关键词：Hydrogenation reaction; PtRu NPs; Carbon; Zeolite; Microwave
摘要：The fabrication of ultrafine PtRu alloy nanoparticles (NPs) confined in mesoporous carbon (MCN) remains a great challenge due to its high carbonization temperature, and the mechanism of ultrafine PtRu alloy NPs for hydrogenation reaction is still ambiguous. We report herein, for the first time, a general synthesis of ultrafine PtRu alloy NPs (less than 1.5 nm) encapsulated in MCN derived from micro-mesoporous zeolite under microwave-assisted heating. The ultrafine PtRu NPs are well dispersed in the structure of mesoporous carbon, and exhibit excellent stability. The reductive Pt2Ru NPs supported on MCN (Pt2Ru/MCN-R, R denotes reduction) exhibit the highest reaction rate constant k (0.894 min(-1)) and TOF (0.317 s(-1)) for 4-nitrophenol (4-NP) reduction, and have an excellent reduction ability for other nitroarenes. In-depth investigation of the structure-property relationship by high resolution transmission electron microscopy, X-ray absorption near edge structure analysis, X-ray photoelectron spectroscopy, and density functional theory calculation revealed that the Pt atoms as the active sites exhibit higher reduction ability for 4-NP, while the Ru atoms as the active sites have higher adsorption ability towards 4-NP. Therefore, the bifunctional mechanism and/or electronic synergistic effects of Pt and Ru play an important role in the reduction of 4-NP, and a good balance between the amount of Ru and Pt with Pt/Ru mole ratio of 2.0 has been demonstrated to be well suitable for 4-NP reduction. (C) 2019 Elsevier Inc. All rights reserved.