采用等体积共浸渍法制备了不同Rh负载量的Rh-Cu-Co-K/LDHs催化剂，考察Rh加入及其质量分数对Rh-Cu-Co-K/LDHs催化剂在合成气制乙醇反应性能上的影响，借助XRD、BET、SEM与EDS、H₂-TPR、XPS、CO-TPD对催化剂进行表征。结果表明，当Rh质量分数为2%时，乙醇的选择性达到最高，为25.03%，此时的CO转化率也达到最高，为54.49%。适量Rh的添加能与Cu产生相互作用，提高Cu与Co的分散度，提高表面Cu物种的质量分数和Rh⁺与Rh⁰物种的质量分数，从而增加催化剂CO的吸附能力，进而提高催化剂的CO转化率与乙醇选择性。

The isometric co-impregnation method is adopted to prepare Rh-Cu-Co-K/LDHs catalysts with different loads of Rh.The effect of Rh and its mass fraction on the catalytic properties of Rh-Cu-Co-K/LDHs catalysts in production of ethanol from syngas.The catalysts are characterized by means of X-ray diffraction (XRD),N₂ adsorption-desorption isotherms (BET),scanning electron microscope (SEM),energy-dispersive spectroscopy (EDS),temperature-programmed reduction of H₂ (H₂-TPR),X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption of CO (CO-TPD).It is shown in the results that both the CO conversion rate and the selectivity of ethanol reach the highest,being 54.49% and 25.03% respectively when the mass fraction of Rh is 2%.An appropriate addition of Rh can interact with Cu each other,enhancing the dispersion degrees of Cu and Co as well as lifting the content of Cu,Rh⁺,and Rh⁰ species on the surface.Moreover,it can therefore improve the absorption ability of catalyst to CO and increase CO conversion rate and the selectivity of ethanol over the catalyst.

钟超泽(1991-),男,硕士,研究方向为化学工程,437241036@qq.com。