Highly Active Ruthenium Catalyst Supported on Barium Hexaaluminate for Ammonia Decomposition to COx-Free Hydrogen,ACS Sustainable Chemistry & Engineering

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Highly Active Ruthenium Catalyst Supported on Barium Hexaaluminate for Ammonia Decomposition to COx-Free Hydrogen
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-04-12 00:00:00 , DOI: 10.1021/acssuschemeng.8b06308
Ziqing Wang _{1,

2} , Zhifeng Cai ₂ , Zhong Wei ₁

Affiliation

Barium hexaaluminate (BHA) obtained from a reverse microemulsion-mediated route is used as a support for Ru nanoparticles to catalyze the NH₃ decomposition reaction, and the relationships between the structure and the catalytic performance over Ru/BHA have been disclosed based on the results of various characterization techniques. Ru/BHA is found to be the most active catalyst among all of the tested Ru catalysts supported on conventional MgO, Al₂O₃, and CNTs used commonly in NH₃ decomposition. Moreover, the activation energy over Ru/BHA is 65.0 kJ/mol; this value is about 1/2 of that for Ru/Al₂O₃ (121.7 kJ/mol) and Ru/MgO (102.8 kJ/mol). It is also found that the presence of electronic interactions between Ru and BHA would improve the electron density and enhance the rate of recombinative desorption of nitrogen over the Ru surface, leading to excellent catalytic activity. Additionally, alleviation of hydrogen poisoning is also preferable for ammonia decomposition.

中文翻译：

六铝酸钡上负载的高活性钌催化剂用于氨分解为无CO _x的氢

通过反向微乳液介导的途径获得的六铝酸钡（BHA）用作Ru纳米粒子催化NH ₃分解反应的载体，并基于该结果公开了结构与Ru / BHA催化性能之间的关系。各种表征技术。发现Ru / BHA是所有负载在常规MgO，Al ₂ O ₃和NH ₃分解中常用的CNT上的所有经过测试的Ru催化剂中活性最高的催化剂。此外，Ru / BHA上的活化能为65.0 kJ / mol；该值约为Ru / Al ₂ O _3的1/2（121.7 kJ / mol）和Ru / MgO（102.8 kJ / mol）。还发现Ru和BHA之间的电子相互作用的存在将改善电子密度并提高Ru表面上氮的重组解吸速率，从而导致优异的催化活性。另外，减轻氨中毒对于氢分解也是优选的。

更新日期：2019-04-12

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