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Supported Palladium Catalysts: A Facile Preparation Method and Implications to Reductive Catalysis Technology for Water Treatment
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsestengg.0c00227 Jinyu Gao 1 , Changxu Ren 1 , Xiangchen Huo 2 , Rundong Ji 1 , Xiaoyu Wen 1 , Juchen Guo 1 , Jinyong Liu 1
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsestengg.0c00227 Jinyu Gao 1 , Changxu Ren 1 , Xiangchen Huo 2 , Rundong Ji 1 , Xiaoyu Wen 1 , Juchen Guo 1 , Jinyong Liu 1
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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 Pd0 nanoparticles in situ within another 5 min under 1 atm H2 at 20 °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, Pd0 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.
中文翻译：
支持的钯催化剂：一种简便的制备方法及其对水处理的还原催化技术的启示
负载钯（Pd）催化剂已被广泛研究用于水净化应用。但是，该技术主要受到Pd成本高和催化剂配方缺乏优化的挑战。在本报告中，我们演示了一种制备和优化Pd催化剂以减少有毒含氧阴离子（溴酸根，氯酸根和高氯酸根）的简便方法。在1 atm H 2下，水溶性Na 2 PdCl 4在5分钟内迅速吸附在活性炭悬浮液中，并在另外5分钟内原位还原成Pd 0纳米颗粒。在20°C下。在材料表征和反应动力学方面，用新方法制备的Pd催化剂与通过常规方法制备的Pd催化剂（涉及多步高温程序）和基准商业Pd催化剂均无显着差异。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，以前报道的Re-Pd / C和Mo-Pd / C催化剂中的贵金属可以节省多达80％，而不会牺牲活性。新型便捷的催化剂制备方法将大大提高还原催化技术在水质净化中的成本效益。
更新日期：2020-12-24
中文翻译：
支持的钯催化剂：一种简便的制备方法及其对水处理的还原催化技术的启示
负载钯（Pd）催化剂已被广泛研究用于水净化应用。但是，该技术主要受到Pd成本高和催化剂配方缺乏优化的挑战。在本报告中，我们演示了一种制备和优化Pd催化剂以减少有毒含氧阴离子（溴酸根，氯酸根和高氯酸根）的简便方法。在1 atm H 2下，水溶性Na 2 PdCl 4在5分钟内迅速吸附在活性炭悬浮液中，并在另外5分钟内原位还原成Pd 0纳米颗粒。在20°C下。在材料表征和反应动力学方面，用新方法制备的Pd催化剂与通过常规方法制备的Pd催化剂（涉及多步高温程序）和基准商业Pd催化剂均无显着差异。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，以前报道的Re-Pd / C和Mo-Pd / C催化剂中的贵金属可以节省多达80％，而不会牺牲活性。新型便捷的催化剂制备方法将大大提高还原催化技术在水质净化中的成本效益。
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