The oxidant-free dehydrogenation of n-pentanol over copper based catalysts was investigated in this paper.The effect of metal modification on the activity and stability of the copper catalyst supported onγ-Al_(2)O_(3...The oxidant-free dehydrogenation of n-pentanol over copper based catalysts was investigated in this paper.The effect of metal modification on the activity and stability of the copper catalyst supported onγ-Al_(2)O_(3)and La_(2)O_(3)(Cu/γ-Al_(2)O_(3)-La_(2)O_(3))was clarified and a Cr modified Cu/Al_(2)O_(3)-La_(2)O_(3)(Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3))showed the best catalytic performance.The conversion of n-pentanol was 70.0%and the selectivity for n-pentanal increased to 97.1%over Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3).X-ray diffraction and temperature programmed reduction of H2 indicated that the addition of Cr favors the formation and reduction of the copper oxide,and the dispersion of the active Cu^(0) species,accounting for the good activity and stability of this catalyst.Furthermore,the lower amount of acidic sites in Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3)is suggested to suppress the dehydration in oxidant-free dehydrogenation of n-pentanol,accounting for the higher selectivity for n-pentanal.展开更多
基金Financial support by the National Natural Science Foundation of China(Nos.20806018 and 21376060)the Natural Science Foundation of Hebei Province(Nos.B2011201017 and B2014201024)are gratefully acknowledged.
文摘The oxidant-free dehydrogenation of n-pentanol over copper based catalysts was investigated in this paper.The effect of metal modification on the activity and stability of the copper catalyst supported onγ-Al_(2)O_(3)and La_(2)O_(3)(Cu/γ-Al_(2)O_(3)-La_(2)O_(3))was clarified and a Cr modified Cu/Al_(2)O_(3)-La_(2)O_(3)(Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3))showed the best catalytic performance.The conversion of n-pentanol was 70.0%and the selectivity for n-pentanal increased to 97.1%over Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3).X-ray diffraction and temperature programmed reduction of H2 indicated that the addition of Cr favors the formation and reduction of the copper oxide,and the dispersion of the active Cu^(0) species,accounting for the good activity and stability of this catalyst.Furthermore,the lower amount of acidic sites in Cu-Cr/γ-Al_(2)O_(3)-La_(2)O_(3)is suggested to suppress the dehydration in oxidant-free dehydrogenation of n-pentanol,accounting for the higher selectivity for n-pentanal.
