Journal of Industrial and Engineering Chemistry, Vol.86, 220-231, June, 2020
Zr-based metal.organic frameworks drived Rh.Mn catalysts for highly selective CO hydrogenation to C2 oxygenates
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A series of Zr-based metal-organic frameworks (UiO-66) supported Rh.Mn catalysts with various metal loadings were prepared by using a co-impregnation method, and the catalytic activities were investigated for the direct synthesis of ethanol-based C2 + oxygenates from CO hydrogenation. The catalysts were comprehensively characterized by means of N2 sorption, XRD, TEM, XPS, H2-TPR, and DRIFT. The structural and textural properties of the catalysts show clearly that the overall framework structure of UiO-66 can be beneficial to the high dispersion of supported metals, but the synergistic effect of Rh and Mn would be influenced by the metal loading or Mn/Rh ratio. When the loadings of Rh and Mn reached 3 wt.% and 3 wt.%, the catalyst has the best catalytic activity with the highest yield of C2 + oxygenates of 200.1 g/(kg h), which can be attributed to the enhanced CO dissociation ability of Rh sites and weaker Rh-CO band strength.
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