采用浓硫酸、浓硝酸组成的混酸体系对多壁碳纳米管进行了酸化处理,并通过浸渍-还原方法合成了Pd/CNTs催化剂,在多壁碳纳米管表面上得到分散均匀的Pd纳米粒子。采用X射线衍射(XRD)及透射电镜(TEM)对Pd/CNTs催化剂试样进行表征,并在酸性...采用浓硫酸、浓硝酸组成的混酸体系对多壁碳纳米管进行了酸化处理,并通过浸渍-还原方法合成了Pd/CNTs催化剂,在多壁碳纳米管表面上得到分散均匀的Pd纳米粒子。采用X射线衍射(XRD)及透射电镜(TEM)对Pd/CNTs催化剂试样进行表征,并在酸性介质中测试合成Pd/CNTs的析氢电化学催化活性。结果表明:Pd/CNTs催化剂能够表现出较强的析氢电催化活性,当电位为-0.5 V时,其电流密度达到828 m A/cm2。展开更多
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
文摘采用浓硫酸、浓硝酸组成的混酸体系对多壁碳纳米管进行了酸化处理,并通过浸渍-还原方法合成了Pd/CNTs催化剂,在多壁碳纳米管表面上得到分散均匀的Pd纳米粒子。采用X射线衍射(XRD)及透射电镜(TEM)对Pd/CNTs催化剂试样进行表征,并在酸性介质中测试合成Pd/CNTs的析氢电化学催化活性。结果表明:Pd/CNTs催化剂能够表现出较强的析氢电催化活性,当电位为-0.5 V时,其电流密度达到828 m A/cm2。
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.
