The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were ...The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.展开更多
电导率是稀土矿渣玻璃陶瓷熔融过程中最重要的物性参数之一,研究电导率对玻璃熔体熔炼工艺优化有指导作用。为了研究尾矿玻璃陶瓷生产制造的熔融过程中稀土对熔体电导率的作用,使用分析纯试剂根据玻璃陶瓷主要化学成分制备玻璃陶瓷熔体...电导率是稀土矿渣玻璃陶瓷熔融过程中最重要的物性参数之一,研究电导率对玻璃熔体熔炼工艺优化有指导作用。为了研究尾矿玻璃陶瓷生产制造的熔融过程中稀土对熔体电导率的作用,使用分析纯试剂根据玻璃陶瓷主要化学成分制备玻璃陶瓷熔体样品,采用交流四电极法研究稀土对玻璃熔体电导率的影响规律,并结合红外光谱技术分析解释熔体电导率的变化机理。研究结果表明,硅酸盐熔体中添加La_(2)O_(3)或提高CaO/SiO_(2)比值会使熔体网络结构解聚,有效提高熔体电导率,且电导率的活化能(Activation energy of electrical conductivity)与La_(2)O_(3)含量和CaO/SiO_(2)比呈负相关关系;CaO/SiO_(2)比值较低时,La_(2)O_(3)含量对活化能影响更加显著,且红外光谱曲线硅酸盐结构带高波数段变化更明显,说明熔体结构发生更强烈的解聚效应;La_(2)O_(3)在CaO/SiO_(2)比值较低时对熔体网络结构和电导率的影响更大。展开更多
基金This work was financially by the Chinese Science and Technology Ministry (Grant No.G1999022404)
文摘The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.
文摘电导率是稀土矿渣玻璃陶瓷熔融过程中最重要的物性参数之一,研究电导率对玻璃熔体熔炼工艺优化有指导作用。为了研究尾矿玻璃陶瓷生产制造的熔融过程中稀土对熔体电导率的作用,使用分析纯试剂根据玻璃陶瓷主要化学成分制备玻璃陶瓷熔体样品,采用交流四电极法研究稀土对玻璃熔体电导率的影响规律,并结合红外光谱技术分析解释熔体电导率的变化机理。研究结果表明,硅酸盐熔体中添加La_(2)O_(3)或提高CaO/SiO_(2)比值会使熔体网络结构解聚,有效提高熔体电导率,且电导率的活化能(Activation energy of electrical conductivity)与La_(2)O_(3)含量和CaO/SiO_(2)比呈负相关关系;CaO/SiO_(2)比值较低时,La_(2)O_(3)含量对活化能影响更加显著,且红外光谱曲线硅酸盐结构带高波数段变化更明显,说明熔体结构发生更强烈的解聚效应;La_(2)O_(3)在CaO/SiO_(2)比值较低时对熔体网络结构和电导率的影响更大。
