Song Xiaowei, Basheer Chanbasha, Xu Jinheng, Zare Richard N
Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
Sci Adv. 2024 Dec 13;10(50):eads4443. doi: 10.1126/sciadv.ads4443.
An innovative method for onsite ammonia synthesis under ambient conditions has been developed using a catalyst mesh composed of magnetite (FeO) and Nafion polymer. We pass air through the catalyst, which condenses microdroplets from atmospheric water vapor and uses nitrogen from the air, resulting in ammonia concentrations ranging from 25 to 120 μM in 1 hour, depending on local relative humidity. Operated at room temperature and atmospheric pressure, this technique eliminates the need for additional electricity or radiation, thereby substantially reducing carbon dioxide emissions compared to the traditional Haber-Bosch process. In laboratory experiments, we further optimized the reaction conditions and scaled up the process. After 2 hours of spraying, the ammonia concentration increased to 270.2 ± 25.1 μM. In addition, we present a portable device designed for onsite ammonia production which consistently produces an ammonia concentration that is adequate for some agricultural irrigation purposes.
利用由磁铁矿（FeO）和Nafion聚合物组成的催化网，开发了一种在环境条件下进行现场氨合成的创新方法。我们使空气通过催化剂，该催化剂从大气水蒸气中冷凝微滴并利用空气中的氮气，根据当地相对湿度，1小时内氨浓度范围为25至120μM。该技术在室温和大气压下运行，无需额外的电力或辐射，因此与传统的哈伯-博施法相比，大幅减少了二氧化碳排放。在实验室实验中，我们进一步优化了反应条件并扩大了工艺规模。喷雾2小时后，氨浓度增加到270.2±25.1μM。此外，我们展示了一种为现场氨生产设计的便携式设备，该设备持续产生的氨浓度足以满足一些农业灌溉目的。
