Cu-based catalysts are advantageous for selectively catalyzing the hydrogenation of the C-O bonds in furfural(FF).Nevertheless,debates are ongoing regarding the identification of active sites.FeCuxMg catalysts were pr...Cu-based catalysts are advantageous for selectively catalyzing the hydrogenation of the C-O bonds in furfural(FF).Nevertheless,debates are ongoing regarding the identification of active sites.FeCuxMg catalysts were prepared using a hydrotalcite precursor.During the early stages of the reaction,the selective hydrogenation activity of the C-O bond exhibited a volcano-shaped trend with increasing Cu content.FeCu_(0.15)Mg showed the highest hydrogenation activity among all catalysts examined.In-situ X-ray diffraction(XRD),in-situ DRIFT,X-ray photoelectron spectroscopy(XPS)and other analytical techniques confirmed that Cu^(0)-Cu^(δ+)sites assume a predominant role in catalytic reactions.At the optimal Cu/Fe ratio,the oxygen vacancies generated by FeO_(x) facilitated the activation of the FF molecules.The highly dispersed Cu^(0)-Cu^(δ+)sites served a crucial function in the activation of H_(2)and the rapid formation of reaction intermediates,significantly accelerating the reaction rate and process of FF hydrogenation.展开更多
基金the National Natural Science Foundation of China(22379131,22208314,22278379 and 22238003)the Natural Science Foundation of Henan Province(242300421601).
文摘Cu-based catalysts are advantageous for selectively catalyzing the hydrogenation of the C-O bonds in furfural(FF).Nevertheless,debates are ongoing regarding the identification of active sites.FeCuxMg catalysts were prepared using a hydrotalcite precursor.During the early stages of the reaction,the selective hydrogenation activity of the C-O bond exhibited a volcano-shaped trend with increasing Cu content.FeCu_(0.15)Mg showed the highest hydrogenation activity among all catalysts examined.In-situ X-ray diffraction(XRD),in-situ DRIFT,X-ray photoelectron spectroscopy(XPS)and other analytical techniques confirmed that Cu^(0)-Cu^(δ+)sites assume a predominant role in catalytic reactions.At the optimal Cu/Fe ratio,the oxygen vacancies generated by FeO_(x) facilitated the activation of the FF molecules.The highly dispersed Cu^(0)-Cu^(δ+)sites served a crucial function in the activation of H_(2)and the rapid formation of reaction intermediates,significantly accelerating the reaction rate and process of FF hydrogenation.
