A series of copper-zirconium oxides with the Cu/Zr ratio ranging from 2/8 to 9/1 were synthesized by the co-precipitation method.The PdO/CumZrn catalysts were prepared and applied to synthesis of allyl ethers via the ...A series of copper-zirconium oxides with the Cu/Zr ratio ranging from 2/8 to 9/1 were synthesized by the co-precipitation method.The PdO/CumZrn catalysts were prepared and applied to synthesis of allyl ethers via the etherification reactions of allyl chloride with alcohols.The characterization results demonstrated that the presence of ZrO_(2) phase not only can facilitate the high dispersion of Pd^(2+),but can also favor the formation of Cu^(+) via the interaction between CuO and ZrO_(2).The catalytic performance initially increases and then falls off with the progressive increase in the Cu/Zr ratio.The superior performance with a conversion of 53.2%along with a selectivity of 60.3%was achieved over the resulting PdO/Cu7Zr3 catalyst with the highest surface molar proportion of Cu^(+).Good catalytic activity was obtained,because the Cu^(+)-Oα-pairs could enhance the dissociative activation of the-O-H bond in alcohols compared with Cu^(2+)-O2-pairs,subsequently promoting the etherification reactions.展开更多
基金The authors are grateful to the financial support from the Jiangsu Province Natural Science Foundation of China(BK20180935)the National Natural Science Foundation of China(22108236)the Yangzhou City Lüyangjinfeng Project of China.
文摘A series of copper-zirconium oxides with the Cu/Zr ratio ranging from 2/8 to 9/1 were synthesized by the co-precipitation method.The PdO/CumZrn catalysts were prepared and applied to synthesis of allyl ethers via the etherification reactions of allyl chloride with alcohols.The characterization results demonstrated that the presence of ZrO_(2) phase not only can facilitate the high dispersion of Pd^(2+),but can also favor the formation of Cu^(+) via the interaction between CuO and ZrO_(2).The catalytic performance initially increases and then falls off with the progressive increase in the Cu/Zr ratio.The superior performance with a conversion of 53.2%along with a selectivity of 60.3%was achieved over the resulting PdO/Cu7Zr3 catalyst with the highest surface molar proportion of Cu^(+).Good catalytic activity was obtained,because the Cu^(+)-Oα-pairs could enhance the dissociative activation of the-O-H bond in alcohols compared with Cu^(2+)-O2-pairs,subsequently promoting the etherification reactions.
