Wang Zhijun, He Ge, Zhang Huazhou, Liao Che, Yang Chi, Zhao Feng, Lei Guangjiu, Zheng Guoyao, Mao Xinchun, Zhang Kun
Institute for Advanced Study, Chengdu University, Chengdu, Sichuan, 610106, P.R. China.
School of Mechanical Engineering, Chengdu University, Chengdu, Sichuan, 610106, P.R. China.
ChemSusChem. 2023 Dec 19;16(24):e202202370. doi: 10.1002/cssc.202202370. Epub 2023 Oct 10.
The efficient decomposition of ammonia to produce CO -free hydrogen at low temperatures has been extensively investigated as a potential method for supplying hydrogen to mobile devices based on fuel cells. In this study, we employed dielectric barrier discharge (DBD) plasma, a non-thermal plasma, to enhance the catalytic ammonia decomposition over supported Ru catalysts (Ru/Y O , Ru/La O , Ru/CeO and Ru/SiO ). The plasma-catalytic reactivity of Ru/La O was found to be superior to that of the other three catalysts. It was observed that both the physicochemical properties of the catalyst (such as support acidity) and the plasma discharge behaviours exerted significant influence on plasma-catalytic reactivity. Combining plasma with a Ru catalyst significantly enhanced ammonia conversion at low temperatures, achieving near complete NH conversion over the 1.5 %-Ru/La O catalyst at temperatures as low as 380 °C. Under a weight gas hourly space velocity of 2400 mL g h and an AC supply power of 20 W, the H formation rate and energy efficiency achieved were 10.7 mol g h and 535 mol g (kWh) , respectively, using a 1.5 %-Ru/La O catalyst.
氨的高效分解以在低温下产生无CO的氢气，作为一种向基于燃料电池的移动设备供应氢气的潜在方法，已得到广泛研究。在本研究中，我们采用介质阻挡放电（DBD）等离子体（一种非热等离子体）来增强负载型Ru催化剂（Ru/Y₂O₃、Ru/La₂O₃、Ru/CeO₂和Ru/SiO₂）上的催化氨分解。发现Ru/La₂O₃的等离子体催化反应活性优于其他三种催化剂。观察到催化剂的物理化学性质（如载体酸度）和等离子体放电行为均对等离子体催化反应活性有显著影响。将等离子体与Ru催化剂相结合可在低温下显著提高氨转化率，在1.5%-Ru/La₂O₃催化剂上，在低至380℃的温度下实现了近乎完全的NH₃转化。在2400 mL g⁻¹ h⁻¹的重量空速和20 W的交流电源下，使用1.5%-Ru/La₂O₃催化剂时，H₂的生成速率和能量效率分别达到10.7 mol g⁻¹ h⁻¹和535 mol g⁻¹ (kWh)⁻¹。
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