Search

Higher alcohols can be synthesized efficiently by CO2 hydrogenation over Ru3(CO)12–Co4(CO)12 bimetallic catalyst with bis(triphenylphosphoranylidene)ammonium chloride (PPNCl) as the cocatalyst and LiBr as the promoter., Iodides are commonly used promoters in C2+OH synthesis from CO2/CO hydrogenation. Here we report the highly efficient synthesis of C2+OH from CO2 hydrogenation over a Ru3(CO)12–Co4(CO)12 bimetallic catalyst with bis(triphenylphosphoranylidene)ammonium chloride (PPNCl) as the cocatalyst and LiBr as the promoter. Methanol, ethanol, propanol and isobutanol were formed at milder conditions. The catalytic system had a much better overall performance than those of reported iodide promoted systems because PPNCl and LiBr cooperated very well in accelerating the reaction. LiBr enhanced the activity and PPNCl improved the selectivity, and thus both the activity and selectivity were very high when both of them were used simultaneously. In addition, the catalyst could be reused for at least five cycles without an obvious change of catalytic performance.

Metal organic frameworks (MOFs) are a new class of materials that are formed by the copolymerization of organic ligands with transition metals.Because of their properties such as high surface areas,microporosity,and the ability to tune pore size,many applications have recently been developed in catalysis,separation,and gas storage.We prepared MOFs by three different methods and characterized them with scanning electron microscopy (SEM),X-ray diffraction (XRD),and infrared (IR) spectroscopy.MOFs prepared via the three methods are completely different in morphology and microstructure.We demonstrate that the MOFs prepared via the "direct mixing" method are very effective heterogeneous catalyst for the transesterification of diethyl carbonate with alcohols to prepare organic carbonates.We studied the effects of the amount of MOFs,the reaction time,and the reaction temperature on product yield.Asymmetric organic carbonates can be produced with moderate to high yields and 100% selectivity via the reaction of diethyl carbonate with aromatic,cyclic,heterocyclic,or aliphatic alcohols.The solid catalyst can be recovered simply by centrifugation and reused for at least two cycles.