01943nas a2200253   4500008004100000022001400041245009700055210006900152260007300221300001000294490000700304520104600311653001901357653002201376653002201398653003601420653001001456100001501466700002101481700002701502700002001529700002401549856011601573       2013                        eng d  a1566-736700aCatalytic activity of ZIF-8 in the synthesis of styrene carbonate from CO2 and styrene oxide0 aCatalytic activity of ZIF8 in the synthesis of styrene carbonate  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a36-400 v323 a<p>The catalytic activity of ZIF-8 in the synthesis of styrene carbonate from carbon dioxide and styrene oxide is presented. ZIF-8 crystals displayed catalytic activity even at temperatures as low as 50 degrees C, with styrene carbonate yields as high as similar to 54% at 100 degrees C. In contrast to many prior-art catalysts, solvents or co-catalysts were not required. Pyridine and ammonia were used as probe molecules to estimate the type and density of acid sites in fresh and reused ZIF-8 catalysts. DRIFT spectroscopy of adsorbed pyridine revealed the presence of both Bronsted (B) and Lewis (L) acid sites. The B-sites have nearly vanished in the case of recycled ZIF-8 catalysts. The simultaneous presence of both the acid sites and the nitrogen basic moieties from the imidazole linker in ZIF-8 promoted the adsorption of the CO2 on the solid surface and its further conversion to the cyclic carbonate. The ZIF-8 catalysts could be recycled and reused without significant loss in catalytic activity. Published by Elsevier B.V.</p>10aCO2 conversion10acyclic carbonates10aStyrene carbonate10aZeolitic imidazolate frameworks10aZIF-81 aZhu, Minqi1 aSrinivas, Darbha1 aBhogeswararao, Seemala1 aRatnasamy, Paul1 aCarreon, Moises, A.  uhttps://library.ncl.res.in/content/catalytic-activity-zif-8-synthesis-styrene-carbonate-co2-and-styrene-oxide-0