Journal
APPLIED CATALYSIS A-GENERAL
Volume 598, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2020.117550
Keywords
CO2; Ethylenediamine; 2-Imidazolidinone; Cyclic urea; Bifunctional catalyst
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Funding
- Vision Group on Science and Technology, Govt. of Karnataka, India under Centre of Excellence in Science Engineering and Medicine (CESEM) Grant [307]
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This study is mainly focused on the design of stable, active and selective catalyst for direct synthesis of 2-imidazolidinone (cyclic urea) from ethylenediamine and CO2. Based on the rationale for the catalyst properties needed for this reaction, KF, ZnO and Al(2)O(3)( )combination was selected to design the catalyst. ZnO/KF/Al2O3 catalyst was prepared by stepwise wet-impregnation followed by the removal of physisorbed KF from the surface. High product yield could be achieved by tuning acid-base sites by varying the composition and calcination temperature. The catalysts were characterized by various techniques like XRD, N-2-sorption, NH3-TPD, CO2-TPD, TEM, XPS and FT-IR measurements. It is shown that acidic and basic properties of the solvent can influence the activity and product selectivity for this reaction. Under optimized condition; 180 degrees C, 10 bar and 10 wt.% catalyst in batch mode, 96.3 % conversion and 89.6 % selectivity towards the 2-imidazolidinone were achieved.
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