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Effect of pore-size distribution on Ru/ZSM-5 catalyst for enhanced N activation to ammonia via dissociative mechanism
Journal of Rare Earths ( IF 5.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jre.2020.04.013
Jihui Cai , Congying Wang , Yi Liu , Jun Ni , Bingyu Lin , Xiuyun Wang , Jianxin Lin , Lilong Jiang

Abstract In the present study, a series of Ru/ZSM-5 catalysts with different pore-size distributions were prepared and investigated for NH3 synthesis. Our studies indicate that Ru/ZSM-5-Mic with micropore structure exhibits superior NH3 synthesis rate, which is much higher than those of Ru/ZSM-5-Mac (with macroporous structure) and Ru/ZSM-5-Mes (with mesoporous structure) catalysts. A series of TPD experiments demonstrate that pore-size distributions play an important role in N2 adsorption and activation over Ru/ZSM-5. Moreover, the addition of La significantly promotes the NH3 synthesis performance over Ru/ZSM-5-Mic. Additionally, in situ DRIFTS studies indicate that the main intermediate species over Ru/ZSM-5-Mic are –NH2, and most of the surface hydrogen species desorb following the H2O-formation pathway.

中文翻译:

孔径分布对Ru/ZSM-5催化剂通过解离机制增强N对氨活化的影响

摘要 在本研究中,制备了一系列不同孔径分布的 Ru/ZSM-5 催化剂,并研究了其用于 NH3 的合成。我们的研究表明,具有微孔结构的 Ru/ZSM-5-Mic 表现出优异的 NH3 合成速率,远高于 Ru/ZSM-5-Mac(具有大孔结构)和 Ru/ZSM-5-Mes(具有介孔结构)。结构)催化剂。一系列 TPD 实验表明,孔径分布在 Ru/ZSM-5 上的 N2 吸附和活化中起着重要作用。此外,与 Ru/ZSM-5-Mic 相比,La 的加入显着提高了 NH3 的合成性能。此外,原位 DRIFTS 研究表明,Ru/ZSM-5-Mic 上的主要中间物质是 –NH2,大多数表面氢物质通过 H2O 形成途径解吸。
更新日期:2020-08-01
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