Rates of Ammonia Absorption and Release in Calcium Chloride [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.823 Shafts
• Thông tin xuất bản: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018
• Mô tả vật lý: Size: p. 11827-11835 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 257274
• Chủ đề: 1. 09 biomass fuels; 2. 17 wind energy; 3. 25 energy storage; 4. 36 materials science; 5. 77 nanoscience and nanotechnology

Tóm tắt

 After synthesis, ammonia can be selectively absorbed by calcium chloride
  nitrogen and hydrogen are not absorbed. The kinetics of release seem to be diffusion controlled. The kinetics of absorption are consistent with a first-order reaction after an initial period of a higher-order reaction, which may indicate a nucleation event. At 225 �C, both absorption and release show half-lives of around 10 min if the ammonia partial pressure is swung from 2 to 1 bar, which allows design of an absorber for the periodic separation of ammonia. Furthermore, when this absorber replaces the ammonia condenser in a conventional ammonia synthesis, the ammonia production at low pressure can have the same rate as the conventional process operating at higher pressure.