Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-E1-10, Ookayama, Meguro-ku, Tokyo, 152-8551 (Japan).
Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-E1-10, Ookayama, Meguro-ku, Tokyo, 152-8551 (Japan).
ChemSusChem. 2015 Jun 22;8(12):2028-30. doi: 10.1002/cssc.201500112. Epub 2015 Apr 17.
An efficient catalytic system for hydrogen production from aqueous solution of urea was developed using ruthenium-based catalysts as an alternative for existing systems based on several H2 carriers. Ru/SiO2 showed the highest H2 yield among various SiO2 -supported transition-metal catalysts. Optimization of the catalyst support revealed that Ru/Al2 O3 exhibited the best catalytic performance, with a minimum amount of CO formed as a by-product (1.8 mol %). A mechanistic study suggested that the reaction proceeds mainly via two steps: urea hydrolysis (H2 NCONH2 +H2 O→2 NH3 +CO2 ) followed by NH3 decomposition (2 NH3 →3 H2 +N2 ).
开发了一种使用基于钌的催化剂的高效催化体系，用于从尿素水溶液中制氢，以替代现有基于多种 H2 载体的系统。在各种负载于 SiO2 的过渡金属催化剂中，Ru/SiO2 表现出最高的 H2 产率。催化剂载体的优化结果表明，Ru/Al2 O3 表现出最佳的催化性能，形成的副产物 CO 最少（1.8 mol%）。机理研究表明，反应主要通过两步进行：尿素水解（H2 NCONH2 +H2 O→2 NH3 +CO2 ），随后是 NH3 分解（2 NH3 →3 H2 +N2 ）。
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