Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 248, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117087
Keywords
Protic ionic liquids; NH3 absorption; N-heterocyclic cations; Pyridinium; Piperidinium
Categories
Funding
- Major Program of National Natural Science Foundation of China [21890764]
- National Natural Science Foundation of China [21776277, 21978306]
- Beijing Municipal Natural Science Foundation [2182071]
- Natural Science Foundation of Hebei Province [B2019103011]
Ask authors/readers for more resources
Ammonia (NH3) is one of the main reasons for the formation of aerosols. NH3 pollution mainly comes from a large amount of emissions in industrial production. Ionic liquids (ILs), as a green solvent, can efficiently separate and recover NH3 from industrial NH3-containing tail gas. In this work, novel protic ionic liquids (PILs) with hydrogen bond donating ability were designed and synthesized by incorporating six-membered N-heterocyclic compounds including pyridinium and piperidinium as cations. Three pyridinium-based PILs with single protic H showed higher NH3 capacity with the maximum of 3.078 mol NH3/mol IL at 313.1 K and 0.10 MPa than the piperidinium-based PILs with double interaction sites. However, there was obvious reduction in NH3 capacity for pyridinium-based PILs during absorption and absorption-desorption cycles. The reason is that the acidic protic H of cations of pyridinium-based PILs is easily stripped in supersaturated alkaline environment due to the smaller pKa of pyridine derivatives than that of NH3, forming the NH4+ and volatile neutral pyridine derivatives. This work will provide useful guidance to the design of novel ILs used for efficient and reversible absorption of NH3.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available