Catalytic-CO2-Desorption Studies of BZA-AEP Mixed Absorbent by the Lewis Acid Catalyst CeO2-γ-Al2O3

Abstract

Traditional organic amines exhibit inferior desorption performance and high regeneration energy consumption. The implementation of solid acid catalysts presents an efficacious approach to mitigate regeneration energy consumption. Thus, investigating high-performance solid acid catalysts holds paramount importance for the advancement and implementation of carbon capture technology. This study synthesized two Lewis acid catalysts via an ultrasonic-assisted precipitation method. A comparative analysis of the catalytic desorption properties was conducted, encompassing these two Lewis acid catalysts and three precursor catalysts. The results demonstrated that the CeO2-γ-Al2O3 catalyst demonstrated superior catalytic desorption performance. Within the desorption temperature range of 90 to 110 °C, the average desorption rate of BZA-AEP catalyzed by the CeO2-γ-Al2O3 catalyst was 87 to 354% greater compared to the desorption rate in the absence of the catalyst, and the desorption temperature can be reduced by approximately 10 °C. A comprehensive analysis of the catalytic desorption mechanism of the CeO2-γ-Al2O3 catalyst was conducted, and indicated that the synergistic effect of CeO2-γ-Al2O3 conferred a potent catalytic influence throughout the entire desorption process, spanning from the rich solution to the lean solution.

Integrated Approach to CO2 Capture and Conversion to Cyclic Carbonates under Solvent- and Additive-Free Conditions Utilizing the CO2 Capture Solvent EEMPA

“…Alternatively, it could result from the deactivation of captured CO 2 by decomposition of the carbamate. 38,39 The cyclic carbonate yields achieved with varied epoxides are reasonable and promising, but the amino alcohol side product observed in reactions with propylene oxide needs to be avoided due to consumption of the capture solvent. Attempts were made to drive the cycloaddition reaction forward from the amino alcohol by the cleavage of the C−N bond formed by aminolysis of the epoxide.…”

“…The increased formation of amino alcohol observed with γ-Al 2 O 3 (Lewis acid) may be attributed to the activation of the epoxide through Al 3+ binding to the oxygen atom of the epoxide, making it more susceptible to nucleophilic attacks. Alternatively, it could result from the deactivation of captured CO 2 by decomposition of the carbamate. , The cyclic carbonate yields achieved with varied epoxides are reasonable and promising, but the amino alcohol side product observed in reactions with propylene oxide needs to be avoided due to consumption of the capture solvent. Attempts were made to drive the cycloaddition reaction forward from the amino alcohol by the cleavage of the C–N bond formed by aminolysis of the epoxide.…”