HNO 3 -pretreated CNTs were employed as supports, and a special ultrasound-assisted impregnation method was designed to prepare supported Cu-Co catalysts for higher-alcohol synthesis from syngas. The catalysts used in...HNO 3 -pretreated CNTs were employed as supports, and a special ultrasound-assisted impregnation method was designed to prepare supported Cu-Co catalysts for higher-alcohol synthesis from syngas. The catalysts used in this work were characterized by N 2 adsorption-desorption, TEM, XRD, H 2 -TPR, CO-TPD techniques. It was found that the pre-treatment procedure of CNTs remarkably promoted the catalytic properties of the Cu-Co/CNTs catalysts. For the Cu-Co catalyst supported on CNTs pre-treated by 68 wt% HNO 3 , some active components were introduced into the CNTs channels, their dispersions and the amount of strongly adsorbed CO-species were improved. The CO conversion and alcohol yield on the HNO 3 -pretreated Cu-Co/CNTs catalyst were increased by ～21% and ～69%, respectively, compared with those on the normal Cu-Co/CNTs catalyst.展开更多
用柠檬酸络合法制备了钙钛矿型 La Fe O3及 La Fe1 - x Cux O3化合物 ,测定了其对酸性红 3B等水溶性染料的光催化降解活性 .利用红外、紫外和光声光谱、正电子寿命谱及光电子能谱等技术分析了 La Fe O3的光催化性能及掺杂对其活性的影...用柠檬酸络合法制备了钙钛矿型 La Fe O3及 La Fe1 - x Cux O3化合物 ,测定了其对酸性红 3B等水溶性染料的光催化降解活性 .利用红外、紫外和光声光谱、正电子寿命谱及光电子能谱等技术分析了 La Fe O3的光催化性能及掺杂对其活性的影响 .结果表明 ,掺杂 Cu2 + 可使 La Fe展开更多
文摘我国高速铁路发展迅速,未来其运行速度将达到400 km/h及以上。针对更高速铁路中弓网受流质量变化,首先研究Cu-Al_(2)O_(3)弥散铜接触线材质性能,然后采用受电弓的三元集中质量块单元和弹性链型悬挂接触网的接触单元,建立弓网耦合动力学模型并借助ANSYS有限元分析软件进行仿真,分析弓网系统在350,380,400和420 km/h 4种速度下受流情况。研究结果表明:使用张力为34 kN时,满足冲击载荷及静载荷条件下的使用安全性,随着列车运行速度增加动态接触压力变化幅度明显增大,其中最大动态接触压力、最小动态接触压力、平均动态接触压力及标准偏差基本满足《高速铁路工程动态验收技术规范》中弓网受流质量评价标准。
基金supported by the Foundation of Shaanxi Educational Committee (2010JK608)the Research Foundation of XATU (204-000092)supported by the National Natural Science Foundation of China (205903603)
文摘HNO 3 -pretreated CNTs were employed as supports, and a special ultrasound-assisted impregnation method was designed to prepare supported Cu-Co catalysts for higher-alcohol synthesis from syngas. The catalysts used in this work were characterized by N 2 adsorption-desorption, TEM, XRD, H 2 -TPR, CO-TPD techniques. It was found that the pre-treatment procedure of CNTs remarkably promoted the catalytic properties of the Cu-Co/CNTs catalysts. For the Cu-Co catalyst supported on CNTs pre-treated by 68 wt% HNO 3 , some active components were introduced into the CNTs channels, their dispersions and the amount of strongly adsorbed CO-species were improved. The CO conversion and alcohol yield on the HNO 3 -pretreated Cu-Co/CNTs catalyst were increased by ～21% and ～69%, respectively, compared with those on the normal Cu-Co/CNTs catalyst.
文摘用柠檬酸络合法制备了钙钛矿型 La Fe O3及 La Fe1 - x Cux O3化合物 ,测定了其对酸性红 3B等水溶性染料的光催化降解活性 .利用红外、紫外和光声光谱、正电子寿命谱及光电子能谱等技术分析了 La Fe O3的光催化性能及掺杂对其活性的影响 .结果表明 ,掺杂 Cu2 + 可使 La Fe
