Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 4, Issue 6, Pages 1556-1562Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cy00921a
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Funding
- National Nature Science Foundation of China [21127011, 21006117, 21006112]
- National Basic Research Program of China [2009CB219901]
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In order to overcome existing solid catalysts' disadvantages of low stability and activity, urea-derived graphitic carbon nitrides (u-g-C3N4) with higher stabilities and more active centers were prepared under different temperatures (550-450 degrees C). With a decrease in preparation temperature from 550 degrees C to 480 degrees C, a u-g-C3N4 of lower crystallinity with a smaller polymerization degree was obtained and found to have a higher catalytic activity for CO2 conversion into propylene carbonate. The higher activity of the u-g-C3N4 caused by decreasing the temperature might be ascribed to the lower crystallinity and polymerization degree, which led to more edge defects, wherein the incompletely-coordinated nitrogen atoms served as the main active sites in the cycloaddition reaction. Among all the prepared catalysts, that prepared at 480 degrees C (u-g-C3N4-480) showed the highest catalytic activity for CO2 conversion and exhibited great suitability for other epoxide substrates.
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