Oxidatively‐Stable Linear Poly(propylenimine)‐Containing Adsorbents for CO2 Capture from Ultradilute Streams

• DOI: 10.1002/cssc.201800438
• Publication Date: 2018-05-29T20:45:30Z
• Authors: Simon H. Pang; Ryan P. Lively; Christopher W. Jones
• Keywords: Cationic polymerization; Chemical Stability

Aminopolymer-based solid sorbents have been widely investigated for the capture of CO2 from dilute streams such as flue gas or ambient air. However, oxidative stability studied aminopolymer, poly(ethylenimine) (PEI), is limited, causing it to lose its capacity after exposure oxygen at elevated temperatures. Here, we demonstrate use linear poly(propylenimine) (PPI), synthesized through a simple cationic ring-opening polymerization, more oxidatively stable alternative PEI with high and amine efficiency. The performance PPI/SBA-15 composites was over range conditions (CO2 partial pressure, adsorption temperature) examine tradeoff between sorption-site accessibility, which expected be limited in polymers relative prototypical hyperbranched PEI. Linear were efficient retained 65-83 % their harsh treatment, compared 20-40 retention Additionally, demonstrated long-term PPI 50 adsorption/desorption cycles no loss performance. Combined other strategies improving kinetics, may play role component adsorbents commercial applications capture.