A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catal...A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catalysts were characterized by TPR,BET,XRD and XPS.The results show that introduction of CO2 into heat treatment atmosphere influences obviously on the structure of catalysts before reaction but less on that of the ones after reaction.The reason is under the conditions of reaction,the bulk structure,pore structure and surface state will voluntarily go to same.The heat treatment atmosphere with different content of CO2 influences obviously on the reductive performance of the catalysts,low reductive temperature is corresponding to high DME space-time yield and right amount of Cu metal and Cu2O to high CO conversion.The introduction of CO2 into heat treatment atmosphere restrains the water-gas shift reaction,raising the DME selectivity.The proper amount of CO2 in the heat treatment atmosphere can result in the increase of DME space-time yield.In this work,when the content of CO2 in the heat treatment atmospheres is 50%,the performance of catalysts is best.展开更多
The pygmy dipole resonance（PDR） of nickel isotopes is studied using the deformed random phase approximation method. The isoscalar character of the pygmy resonance is confirmed, and the correlation between the pygmy ...The pygmy dipole resonance（PDR） of nickel isotopes is studied using the deformed random phase approximation method. The isoscalar character of the pygmy resonance is confirmed, and the correlation between the pygmy resonance and neutron skin thickness is discussed. Our investigation shows a linear correlation between PDR integral cross section and neutron skin thickness when the excess neutrons lie in pf orbits, with a correlation rate of about 0.27 fm^（-1）. However, in more neutron-rich nickel isotopes, the growth of the pygmy dipole resonance is stagnant. Although the neutron skin thickness increases, the whole skin is not active. There is an inertial part in the nuclei^（70-78）Ni which does not participate in the pygmy resonance actively and as a result, contributes little to the photo-absorption cross section.展开更多
文摘A series of CuZnAl slurry catalysts were prepared by the complete liquid-phase technology.The influence of heat treatment atmospheres with different proportions of CO2 on the performance was investigated and the catalysts were characterized by TPR,BET,XRD and XPS.The results show that introduction of CO2 into heat treatment atmosphere influences obviously on the structure of catalysts before reaction but less on that of the ones after reaction.The reason is under the conditions of reaction,the bulk structure,pore structure and surface state will voluntarily go to same.The heat treatment atmosphere with different content of CO2 influences obviously on the reductive performance of the catalysts,low reductive temperature is corresponding to high DME space-time yield and right amount of Cu metal and Cu2O to high CO conversion.The introduction of CO2 into heat treatment atmosphere restrains the water-gas shift reaction,raising the DME selectivity.The proper amount of CO2 in the heat treatment atmosphere can result in the increase of DME space-time yield.In this work,when the content of CO2 in the heat treatment atmospheres is 50%,the performance of catalysts is best.
基金Supported by National Science Foundation of China
文摘The pygmy dipole resonance（PDR） of nickel isotopes is studied using the deformed random phase approximation method. The isoscalar character of the pygmy resonance is confirmed, and the correlation between the pygmy resonance and neutron skin thickness is discussed. Our investigation shows a linear correlation between PDR integral cross section and neutron skin thickness when the excess neutrons lie in pf orbits, with a correlation rate of about 0.27 fm^（-1）. However, in more neutron-rich nickel isotopes, the growth of the pygmy dipole resonance is stagnant. Although the neutron skin thickness increases, the whole skin is not active. There is an inertial part in the nuclei^（70-78）Ni which does not participate in the pygmy resonance actively and as a result, contributes little to the photo-absorption cross section.
