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Novel Rapid Screening of Basic Immobilized Amine Sorbent/Catalyst Water Stability by a UV/Vis/Cu 2+ Technique
Author(s) -
Wilfong Walter Christopher,
Kail Brian W.,
Wang Qiuming,
Gray McMahan L.
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801851
Subject(s) - thermogravimetric analysis , sorbent , amine gas treating , catalysis , ultrapure water , chemistry , aqueous solution , thermal stability , chemical stability , organic chemistry , materials science , adsorption , nanotechnology
Time‐consuming thermogravimetric analysis (TGA) decomposition study is a typical practice to assess the stability of fresh and water‐treated basic immobilized amine sorbents (BIAS)/catalysts. This work presents a faster and more precise spectroscopic UV/Vis/Cu 2+ sorbent screening technique that quantifies aqueous amines washed from the BIAS by using UV‐active amine/Cu 2+ complexes. Six BIAS‐based catalysts, containing different amine species and a crosslinker within silica, were treated with ultrapure water and then analyzed for their CO 2 capture performance and amine leach resistance/stability by using TGA (catalysts, approximately 4 h) and UV/Vis/Cu 2+ techniques (wash solution, few minutes). A comparative analysis revealed that directly quantifying washed amines with UV/Vis/Cu 2+ is 9–127 times more precise than indirect testing of the sorbents by TGA. Similar trends in the H 2 O stability profiles of the catalysts [organic content retained values (OCR)] were reported by both analysis methods, allowing UV/Vis/Cu 2+ to replace TGA for quantifying unstable leached amines. The UV/Vis/Cu 2+ OCR results could be used to predict the CO 2 ‐capture stability profile of the sorbents, confirming the reliability of this technique to rapidly screen catalyst stability and performance.