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Revealing nitrogen-containing species in commercial catalysts used for ammonia electrosynthesis
Nature Catalysis ( IF 42.8 ) Pub Date : 2020-10-26 , DOI: 10.1038/s41929-020-00527-4
Yifu Chen , Hengzhou Liu , Nguon Ha , Stuart Licht , Shuang Gu , Wenzhen Li

Stimulated by the growing demand for sustainable and/or economical distributed ammonia synthesis, the electrochemical nitrogen reduction reaction has attracted considerable interest. The nitrogen-containing impurities in commercial metal-based nitrogen reduction reaction catalysts such as metal oxides and metallic irons have, however, been overlooked. Herein we report the presence of nitrogen-containing species in NOx or nitrides at substantial levels revealed from many commercial catalysts. We call attention to the necessity to screen the NOx/nitrides impurities in commercial catalysts, as the nitrogen impurities are not commonly listed in vendors’ assay documents. A simple two-step procedure (alkaline/acidic treatment followed by HPLC/UV–vis analysis) is recommended as a reliable protocol for screening NOx/nitrides impurities in catalyst materials. A case analysis is also carried out on the previously reported H2O–NaOH–KOH system with both 15N-isotopic labelling and nitrogen elemental tracking, reassigning the true nitrogen source of the electrochemically produced NH3 from gaseous N2 to nitrogen-containing impurities in catalysts.



中文翻译:

揭示用于氨电合成的商业催化剂中的含氮物质

由于对可持续和/或经济的分布式氨合成的需求不断增长,电化学氮还原反应引起了人们的极大兴趣。然而,商业金属基氮还原反应催化剂中的含氮杂质,例如金属氧化物和金属铁,已被忽略。在这里,我们报告中的NO含氮物质的存在X -或在相当水平的氮化物从许多商业催化剂透露。我们提请您注意筛选NO x的必要性-商用催化剂中的/氮化物杂质,因为氮杂质通常未在供应商的测定文件中列出。一个简单的两步法(碱性/酸性处理然后通过HPLC / UV-VIS分析)被推荐为用于筛选NO一个可靠的协议X -在催化剂材料/氮化物的杂质。还对先前报道的具有15 N同位素标记和氮元素追踪的H 2 O–NaOH–KOH系统进行了案例分析,将电化学生成的NH 3的真实氮源从气态N 2重新分配为含氮催化剂中的杂质。

更新日期:2020-10-28
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