[2D10-14] C1 chemistry(1)

[2D10] New low-temperature methanol synthesis from syngas containing CO₂ via self-catalysis of methanol and Cu/ZnO catalysts

○Fei Chen¹, Guohui Yang¹, Noritatsu Tsubaki¹ (1. University of Toyama)

Binary Cu/ZnO catalysts were prepared by solid-state method and tested for vapor-phase low-temperature methanol synthesis from CO₂-containing syngas. The physicochemical properties were studied by XRD, XPS, XAES, XRF, H₂-TPR, SEM, TEM, N₂ physisorption, N₂O chemisorption, TG-DTA, FT-IR, CO₂-TPD and NH₃-TPD techniques. The H₂C₂O₄/(Cu+Zn) molar ratio had an obvious effect on the physicochemical properties and thus influenced the catalytic activity. The space time yield (STY) of methanol exhibited a linear relationship with the Cu⁰ surface area, and also increased linearly by enhancing the number of strongly acidic sites or moderately basic sites. The effects of reaction temperature, flow rate of accompanying methanol promoter and catalyst stability were also investigated in detail. A suitable H₂C₂O₄ amount was favorable for improving the catalytic activity. And maximum turnover frequency (TOF) and STY values were obtained over C_4-Red catalyst. The present work provided new insights in designing highly efficient Cu/ZnO catalysts for methanol synthesis.

Keywords:low-temperature methanol synthesis, supercritical CO2 drying, CuZn-based catalysts