Preparation of Nanoporous Carbonaceous Promoters for Enhanced C02 Absorption in Tertiary Amines

• 来源期刊: 工程（英文）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: Clean Power Technology-Review
• 页码范围: 1381-1394
• 页数: 14页
• 语种: 英文

摘要

Aqueous solutions of tertiary amines are promising absorbents for C02 capture,as they are typically characterized by a high absorption capacity,low heat of reaction,and low corrosivity.However,tertiary amines also exhibit very low kinetics of C02 absorption,which has made them unattractive options for large-scale utilization.Here,a series of novel nanoporous carbonaceous promoters(NCPs)with different properties were synthesized,characterized,and used as rate promoters for C02 absorption in aqueous N,N-diethylethanolamine(DEEA)solutions.To prepare a DEEA-NCP nanofluid,NCPs were dispersed into aqueous 3 mol-L-1 DEEA solution using ultrasonication.The results revealed that among microporous(GC)and mesoporous(GS)carbonaceous structures functionalized with ethylenediamine(EDA)and polyethyleneimine(PEI)molecules,the GC-EDA promoter exhibited the best performance.A comparison between DEEA-GC-EDA nanofluid and typical aqueous DEEA solutions highlighted that the GC-EDA promoter enhances the rate of C02 absorption at 40 ℃ by 38.6％(36.8-50.7 kPa·min-1)and improves the equilibrium CO2 absorption capacity(15 kPa;40 ℃)by 13.2％(0.69-0.78 mol of CO2 per mole of DEEA).Moreover,the recyclability of DEEA-GC-EDA nanofluid was determined and a promotion mechanism is suggested.The outcomes demonstrate that NCP-GC-EDA in tertiary amines is a promising strategy to enhance the rate of C02 absorption and facilitate their large-scale deployment.