Selective extraction of supported Rh nanoparticles under mild, non-acidic conditions with carbon monoxide.

Selective extraction of supported Rh nanoparticles under mild, non-acidic conditions with carbon monoxide.
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在温和、非酸性条件下用一氧化碳选择性萃取负载型 Rh 纳米颗粒。

DOI:
10.1039/c8ta06508j
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发表时间:
2018
期刊:
Journal of materials chemistry. A
影响因子:
--
通讯作者:
Denmark,ScottE
Denmark,ScottE
中科院分区:
--
文献类型:
--
作者:
Ibrahim,MalekYS;Denmark,ScottE

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由于供应有限,贵金属(尤其是铑)的回收对于维持某些纳米技术的发展至关重要。在这里,我们报告了一个温和的,有效的,和选择性的方法回收铑,依赖于使用一氧化碳提取铑纳米粒子在极性溶剂中的各种支持。与传统的回收技术不同,这种方法在低温下操作,不需要强酸。此外,CO诱导的浸出在相对于其它贵金属对铑的选择性方面与通过酸的浸出互补,并且导致以还原的金属簇的形式的金属回收。该方法在新鲜还原的表面上表现最好,并且可以通过添加叔胺来促进。除CO气体外,甲酸也可用作净化剂,通过Rh催化分解产生CO。CO诱导浸出的概念可以应用于从核废料中提取铑,并扩展到修饰铑纳米颗粒的尺寸和组成。
Owing to their limited supplies, recycling of precious metals, especially rhodium, is vital to sustain the growth of certain nanotechnologies. Here we report a mild, efficient, and selective method for rhodium recovery that relies on the use of carbon monoxide to extract rhodium nanoparticles on various supports in polar solvents. Unlike the traditional recycling technologies, this method operates at low temperature and does not require strong acids. Moreover, the CO-induced leaching is complimentary to leaching by acids in terms of selectivity toward rhodium versus other precious metals and results in metal recovery in the form of reduced metallic clusters. The method performs best on freshly reduced surfaces and can be promoted by the addition of tertiary amines. Besides CO gas, formic acid can also be used as a leachant by decomposition to produce CO by Rh catalysis. The concept of CO-induced leaching could be applied to the extraction of rhodium from nuclear waste and extended to modify rhodium nanoparticle size and composition.
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