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The influence of Mg/Al molar ratio on the performance of CuMgAl-x catalysts for CO hydrogenation to methanol

Frontiers in Chemistry, ISSN: 2296-2646, Vol: 12, Page: 1361930
2024
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The CuMgAl-x catalysts derived from hydrotalcite precursors with different Mg/Al molar ratios were synthesized and applied to CO hydrogenation to methanol reaction. In this study, the effects of Mg/Al molar ratio on the structure and surface properties of CuMgAl-x catalysts were investigated by XRD, N adsorption-desorption, SEM, TEM, H-TPR, CO-TPD, XPS, and in situ DRIFTS characterization methods. The results showed that an appropriate Mg/Al molar ratio can enhance the Cu-MgO interaction, increasing the basic sites and obtaining suitable acid sites. The dispersion of active Cu on the CuMgAl-x catalysts can be improved by strong Cu-MgO interaction, which enhances the adsorption capacity of CO and makes H activation easier, accelerates the conversion of intermediate species CO and HCOto HCOO, and facilitates further conversion to CHO and CHOH. The strong interaction between Cu and MgO was conducive to the formation of Cu, which can inhibit the desorption of CO in the reverse water gas shift reaction. The CuMgAl-3 catalyst showed the highest CO Conversion rate (14.3%), methanol selectivity (94.5%), and STY of methanol (419.3 g⋅kg⋅h) at 240°C and 2.5 MPa. The results obtained in this paper can provide a new idea for the design of high-performance catalysts for CO hydrogenation to methanol.

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