Catalytic conversion of CO2 by supported ionic liquid prepared with supercritical fluid deposition in a continuous fixed-bed reactor. (October 2022)

• Record Type: Journal Article
• Authors: Li, Xintong; Sun, Jianfei; Xue, Mantong; Yin, Jianzhong
• Is Part Of: Journal of CO₂ utilization. Volume 64(2022)
• Publication Date: 2022-10
• Subjects: CO2 catalytic conversion -- Propylene carbonate -- Supported ionic liquids -- Supercritical fluid deposition -- Continuous fixed-bed reactor; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.102168
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: The capture and fixation of CO2 can effectively alleviate greenhouse effect. Propylene carbonate is a highly efficient solvent, which can be used as an excellent medium for lithium battery. It is of great significance to convert CO2 into propylene carbonate. In this paper, ionic liquid BMImBr was immobilized into the pores of SBA-15 by supercritical deposition, and BMImBr@SBA-15 was obtained for catalytic conversion of CO2 . The catalytic properties of BMImBr and BMImBr@SBA-15 were investigated by batch method. Then the catalytic performance of supported catalyst BMImBr@SBA-15 was investigated by continuous method, which was carried out in a fixed-bed reactor. The continuous experiments controlled the CO2 pressure change (0.5–2.0 MPa) when the inlet liquid flow rate was 0.02 mL/min and 0.04 mL/min. Under the conditions of 0.04 mL/min and 1.0 MPa, the yield was the highest (66.14 %). In this paper, through the calculation of the reaction rate constant, it can be concluded that the continuous method can avoid the repeated packing of the catalyst and obtain a higher yield in a short time. It has a broad prospect of industrialization. Highlights: BMImBr was immobilized on SBA-15 molecular sieve by supercritical deposition. Catalyst activity of BMImBr@SBA-15 was investigated in batch and continuous modes. The highest yield was 66.14 % in a continuous fixed bed reactor. Si-OH cooperates with halogen anions to promote ring opening of epoxides.