Supported Palladium Catalysts: A Facile Preparation Method and Implications to Reductive Catalysis Technology for Water Treatment
Supported Palladium Catalysts: A Facile Preparation Method and Implications to Reductive Catalysis Technology for Water Treatment
复制标题
DOI：
10.1021/acsestengg.0c00227
复制
发表时间：
2021-03-12
影响因子：
7.1
通讯作者：
Liu, Jinyong
中科院分区：
文献类型：
--
作者：
Gao, Jinyu;Ren, Changxu;Liu, Jinyong
负载型钯 (Pd) 催化剂已在水净化应用中得到广泛研究。然而，该技术主要面临钯成本高和催化剂配方缺乏优化的挑战。在本报告中，我们展示了一种制备和优化用于减少有毒氧阴离子（溴酸盐、氯酸盐和高氯酸盐）的钯催化剂的便捷方法。水溶解的Na2PdCl4在5分钟内快速吸附在活性炭悬浮液中，并在20℃、1atm H-2下在另外5分钟内原位还原为Pd-0纳米颗粒。在材料表征和反应动力学方面，用新方法制备的Pd催化剂与传统方法（涉及多步高温程序）制备的催化剂和基准商业Pd催化剂没有显着差异。通过非常简单的方法来控制、评估和优化催化剂中的 Pd 含量，我们阐明了 Pd 含量、Pd-0 粒径和催化活性之间的关系。我们进一步证明，之前报道的 Re-Pd/C 和 Mo-Pd/C 催化剂中的贵金属可以节省高达 80%，而不会牺牲活性。新型便捷的催化剂制备方法将显着提高水净化还原催化技术的成本效益。
Supported palladium (Pd) catalysts have been extensively studied for water purification applications. However, this technology is primarily challenged by the high cost of Pd and the lack of optimization of catalyst formulations. In this report, we demonstrate a convenient approach to prepare and optimize Pd catalysts for the reduction of toxic oxyanions (bromate, chlorate, and perchlorate). Water-dissolved Na2PdCl4 was quickly adsorbed in the suspension of activated carbon within 5 min and reduced into Pd-0 nanoparticles in situ within another 5 min under 1 atm H-2 at 20 degrees C. In terms of both material characterizations and reaction kinetics, the Pd catalysts prepared with the new method show no significant difference from those prepared by the conventional method (involving multiple-step high-temperature procedures) and from benchmark commercial Pd catalysts. With the very simple approach to control, evaluate, and optimize Pd content in the catalyst, we elucidate the relationships among the Pd content, Pd-0 particle size, and catalytic activity. We further showcase that the precious metals in previously reported Re-Pd/C and Mo-Pd/C catalysts can be saved up to 80% without sacrificing the activity. The new and convenient catalyst preparation method will significantly enhance the cost-effectiveness of reductive catalysis technologies for water purification.