Synthesis and Catalytic Performance of Graphene Modified CuO-ZnO-Al2O3forCO2Hydrogenation to Methanol

摘要

CuO-ZnO-Al2O3and graphene nanosheet (GNS) were synthesized by coprecipitation route and reduction of exfoliated graphite oxides method, respectively. GNS modified CuO-ZnO-Al2O3nanocomposites were synthesized by high energy ball milling method. The structure, morphology, and character of the synthesized materials were studied by BET, XRD, TEM, and H2-TPR. It was found that by high energy ball milling method the CuO-ZnO-Al2O3nanoparticles were uniformly dispersed on GNS surfaces. The catalytic performance for the methanol synthesis from CO2hydrogenation was also tested. It was shown experimentally that appropriate incorporation of GNS into the CuO-ZnO-Al2O3could significantly increase the catalyst activity for methanol synthesis. The 10 wt.% GNS modified CuO-ZnO-Al2O3catalyst gave a methanol space time yield (STY) of 92.5% higher than that on the CuO-ZnO-Al2O3catalyst without GNS. The improved catalytic performance was attributed to the excellent promotion of GNS to dispersion of CuO and ZnO particles.