Novel Rapid Screening of Basic Immobilized Amine Sorbent/Catalyst Water Stability by a UV/Vis/Cu2+ Technique. Issue 23 (30th October 2018)

• Record Type: Journal Article
• Authors: Wilfong, Walter Christopher; Kail, Brian W.; Wang, Qiuming; Gray, McMahan L.
• Is Part Of: ChemSusChem. Volume 11:Issue 23(2018)
• Page Start: 4114
• Page End: 4122
• Publication Date: 2018-10-30
• Subjects: amines -- heterogeneous catalysis -- screening -- catalyst stability -- UV/Vis spectroscopy; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201801851
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: 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 CO2 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 H2 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 CO2 ‐capture stability profile of the sorbents, confirming the reliability of this technique to rapidly screen catalyst stability and performance. Abstract : Have your cake and eat it too : Lengthy thermal gravimetric analysis for sorbent decomposition studies (ca. 4 h) can be replaced by a rapid UV/Vis/Cu 2+ spectroscopy method (few minutes) to assess the leach resistance of basic immobilized amine sorbents/catalysts. This novel technique not only saves time but is more precise in assessing catalyst stability and predicting their performance.