A study to develop new catalyst CuO-ZnO-CeO2 for methanol synthesis from H2/CO2 mixture
Abstract
In this study, new catalysts based on CuO-ZnO-CeO2 were developed for the methanol systhesis from H2/CO2 mixture at low pressure. The catalysts were prepared by deposition of Cu-Zn over CeO2 (CZ/Ce) or by co-precipitation of Cu, Zn and Ce (CZ-Ce). Samples were evaluated by the reaction of converting H2/CO2 to methanol at 5 bar, 250°C, and GHSV = 36,000h-1. In addition, the catalysts were characterised by XRD, N2 adsorption, TPR-H2 and SEM-EDX. The methanol productivity of CZ/Ce catalyst (MTYCZ/Ce = 120.9gCH3OH. kgcata-1.h-1) is better than CZ-Ce (MTYCZ-Ce = 110.4 gCH3OH. kgcata-1.h-1) but its methanol selectivity is lower (SCH3OH(CZ/Ce) = 65.5%; SCH3OH(CZ-Ce) = 71.1%). It clearly demonstrated that the activity of CZ/Ce and CZ-Ce in methanol synthesis is 4.3-4.7 times as much as traditional CuO-ZnO/Al2O3 catalyst. Furthermore, the methanol selectivity of the new catalyst is also higher than that of CuO-ZnO-Al2O3 (5.2 - 5.7 times higher). The Cu-Ce interaction (revealed by TPR-H2) could be the active site for methanol synthesis from H2/CO2 mixture.
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