960化工网/ 文献/ 论文详情

Ammonia Decomposition over Water-Durable Hexagonal BaTiO3−xNy-Supported Ni Catalysts

KiyaOgasawara,MasayoshiMiyazaki,KazukiMiyashita,HitoshiAbe,YasuhiroNiwa,MasatoSasase,MasaakiKitano,HideoHosono
Advanced Energy Materials Pub Date : 07/25/2023 00:00:00 , DOI:10.1002/aenm.202301286
Abstract
Nickel is a promising candidate as an alternative to ruthenium for an ammonia decomposition catalyst. However, the performance of Ni-based catalysts for ammonia decomposition is still not sufficient to achieve a good hydrogen production rate under low-temperature because the weak nitrogen affinity of Ni reduces the frequency of the ammonia decomposition reaction. Here, it is reported that Ni supported on barium titanium oxynitride (Ni/h-BaTiO3−xNy) with a hexagonal structure acts as a highly active and water-durable catalyst for ammonia decomposition. The operation temperature is reduced by over 140 °C when N3− ions are substituted onto the O2− sites of the BaTiO3 lattice, and the Ni/h-BaTiO3−xNy catalyst significantly outperforms conventional oxide-supported Ni catalysts for ammonia decomposition. Furthermore, the activity of Ni/h-BaTiO3−xNy remains unchanged after exposure to water. The 15NH3 decomposition reaction and Fourier transform-infrared spectroscopy (FT-IR) measurements reveal that lattice nitrogen vacancy sites on h-BaTiO3−xNy function as the active sites for ammonia decomposition. The ammonia decomposition activity of Ni/h-BaTiO3−xNy is also higher than that of the Ni/h-BaTiO3−xHy oxyhydride catalyst, making a contrast to the activity trend in ammonia synthesis.
引用文献
推荐文献
微信二维码
  • 微信公众号二维码
  • 关注官方微信公众号
  • 微信二维码
  • 微信扫码联系客服
平台客服