Combination and interaction of ammonia synthesis ruthenium catalysts

✍ Scribed by Qing-Chi Xu; Jing-Dong Lin; Jun Li; Xian-Zhu Fu; Zhen-Wei Yang; Wei-Ming Guo; Dai-Wei Liao

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 653 KB
• Volume: 259
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2006.06.030

✦ Synopsis

Based on combination advantages of both supports MgO and carbon nanotubes (CNTs), a novel combination-type catalyst for ammonia synthesis has been developed, in which two catalysts, K-Ru/MgO and K-Ru/CNTs, are combined with the optimal weight ratio of 1/1. The results show that the highest catalytic activity of the combination-type ruthenium catalyst, K-Ru/CNTs + K-Ru/MgO, for ammonia synthesis reaches 4453 mol NH 3 h -1 g -1 -cat at 673 K under 0.2 MPa, which is about two times higher than the average activity of the two catalysts under the same operating conditions. It is suggested that there is a complementary interaction between the two supports (CISS), MgO and CNTs, and the combination of both K-MgO and K-CNTs promotes electron transfer from alkali metallic atoms to the B 5 -sites of ruthenium.