Ammonia decomposition over the ruthenium catalysts deposited on magnesium–aluminum spinel

• Published in: Applied catalysis. A, General Vol. 264; no. 1; pp. 59 - 63
• Main Authors: Szmigiel, Dariusz, Raróg-Pilecka, Wioletta, Miśkiewicz, Elżbieta, Kaszkur, Zbigniew, Kowalczyk, Zbigniew
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 18.06.2004; Elsevier
• Subjects: Ammonia decomposition; Barium caesium promoter; Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Magnesium–aluminum spinel support; Ruthenium catalyst; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ruthenium catalyst; Magnesium–aluminum spinel support; Ammonia decomposition; Barium caesium promoter; Barium; Ruthenium; Support; Magnesium-aluminum spinel support; Decomposition; Promoter; Ammonia; Spinel; Spinels; Magnesium; Catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2003.12.038

Ruthenium catalysts (4.6 wt.%) supported on the magnesium–aluminum spinel and promoted with barium (Ba:Ru=1:1 molar ratio) or caesium (Cs:Ru=1:1) were studied in the reaction of ammonia decomposition under a 1 bar pressure. Both Ba-Ru/MgAl 2O 4 and Cs-Ru/MgAl 2O 4 proved to be significantly more active than the unpromoted system (a factor of 10) and more active than the conventional magnetite-based catalyst used commonly in the NH 3 synthesis. However, the surfaces of the spinel-based catalysts were less active (TOF) than those of analogously promoted (Ba, Cs) ruthenium on carbon.