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首页> 外文期刊>Journal of Hazardous Materials >Activating palladium nanoparticles via a Mott-Schottky heterojunction in electrocatalytic hydrodechlorination reaction
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Activating palladium nanoparticles via a Mott-Schottky heterojunction in electrocatalytic hydrodechlorination reaction

机译：在电催化加氢脱氯反应中通过Mott-Schottky异质结活化钯纳米颗粒

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摘要

This work exploited one novel power of the Mott-Schottky heterojunction interface in activating the palladium (Pd) in electrocatalytic hydrodechlorination reaction (EHDC, one reaction targeted for the abatement of chlorinated organic pollutants from water). By forming a Mott-Schottky contact with polymer carbon nitride (Pd-PCN), the Pd nanoparticles enable a relatively complete and pseudo-first-order conversion of 2,4-dichlorophenol (2,4-DCP) to phenol and Cl- with the reaction rate constant (k(obs)) triple that of the conventional Pd-C (0.68 vs. 0.26 min(-1) mol(Pd)(-1)). Further comparison in k(obs) of Pd-PCN and the Pd catalysts reported in literatures revealed that our Pd-PCN was among the top active catalysts for EHDC. The robust performance of PdPCN was attributed to the strong metal-support interactions at the Mott-Schottky heterojunction interface, which enriched the electron on Pd and improved its anti-poisoning ability against phenol. The strong support-metal interactions also endowed Pd-PCN with high activity/structure stability in EHDC. The presence of some anions in water body including NO3-, NO2- and Cl- exerted little effect on EHDC, while the reduced sulfur compounds (S-2(-) and SO32-), even in a very low concentration (1 mM), could significantly deactivate the catalyst. This work provides a facile and efficient strategy to activate noble metals in catalytic reactions.
机译：这项工作利用了Mott-Schottky异质结界面在电催化加氢脱氯反应（EHDC，旨在减少水中的氯化有机污染物的一种反应）中活化钯（Pd）的一种新能力。通过与聚合物碳氮化物（Pd-PCN）形成Mott-Schottky接触，Pd纳米颗粒可以将2,4-二氯苯酚（2,4-DCP）相对完全地和伪一级转化为苯酚和Cl-反应速率常数（k（obs））是常规Pd-C的三倍（0.68对0.26 min（-1）mol（Pd）（-1））。 Pd-PCN与文献中报道的Pd催化剂的k（obs）进一步比较表明，我们的Pd-PCN是EHDC的顶级活性催化剂之一。 PdPCN的强大性能归因于Mott-Schottky异质结界面处的强金属-支持相互作用，这丰富了Pd上的电子并提高了其对苯酚的抗中毒能力。强大的支撑金属相互作用也使Pd-PCN在EHDC中具有高活性/结构稳定性。水体中某些阴离子（包括NO3-，NO2-和Cl-）的存在对EHDC几乎没有影响，而还原的硫化合物（S-2（-）和SO32-）即使在很低的浓度下（1 mM） ，可能会使催化剂大大失活。这项工作提供了一种简便有效的策略来激活催化反应中的贵金属。

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