32 research outputs found
Activity of Cs (K)-promoted Cu-MgO in the formation of oxygenates from CHâOH/CO and CO/Hâ
The selective synthesis of Câ oxygenates, especially ethanol, from Câ species such as CHâOH and synthesis gas (CO/Hâ) is of interest as the demand for clean fuels, including biofuels, increases. However, over alkali-promoted Cu-ZnO catalysts the synthesis of Câ oxygenates occurs with very low selectivity. Previous mechanistic studies suggest that the basic properties and the Cu properties of these catalysts are critical in determining the Câ oxygenate selectivity. However, the possible synergistic effect of these catalyst properties on the selectivity of Câ oxygenates is poorly understood. In the present study, Cu-MgO catalysts were investigated since MgO possesses noticeably higher basic properties compared to ZnO. Furthermore to address the knowledge gap in the literature with respect to a synergistic effect between catalyst basic properties and Cu properties on the synthesis of Câ oxygenates from CHâOH/CO, MgO, Cu-MgO and Cs (K)-promoted-Cu-MgO catalysts were prepared, characterized and tested at 101kPa and 498-523K. The catalysts had intrinsic basicities of 3.9 â 17.0 ÎŒmol COâ.mâ»ÂČ, SACu° of 66 C-atom%). The reaction kinetics of CHâOH was studied. The Cs-Cu-MgO catalyst was noticeably less active for the synthesis of oxygenates, compared to a conventional Cs-Cu-ZnO catalyst, which was caused by lower Cu dispersion and weaker Cu-metal oxide interaction in the Cs-Cu-MgO compared to Cs-Cu-ZnO, as well as poor electronic-conductivity and lack of hydrogenation-activity of MgO compared to ZnO.Applied Science, Faculty ofChemical and Biological Engineering, Department ofGraduat
Solubility Calculation of Oil-Conta-minated Drill Cuttings in Supercritical Carbon Dioxide Using Statistical Associating Fluid Theory (PC-SAFT)
Mathematical Modeling of Supercritical Extraction of Valerenic Acid from Valeriana officinalis
Extraction rates of oil from high oleic sunflower seeds with supercritical carbon dioxide
Solubility determination of organometallic complexes in supercritical carbon dioxide by chromatographic impulse response method
autho