The environmental problem resulting from the traditional production process of chromic oxide has spawned public concerns all over the world.Integrated in the clean production technology of chromium compounds with sub-...The environmental problem resulting from the traditional production process of chromic oxide has spawned public concerns all over the world.Integrated in the clean production technology of chromium compounds with sub-molten salt media,the preparation process of chromic oxide through hydrogen reduction of alkali metal chromate salt enables the clean and short-route preparation of chromic oxide.Moreover,the alkali metal hydroxide byproducts can be recycled as reaction media inside the process.To explore the reaction kinetics and mechanisms of the hydrogen reduction process,the reduction of sodium chromate in H2 atmosphere was investigated by using TGA and DSC techniques.The isothermal TGA measurement results showed that in the temperature range from 703 K to 773 K,the hydrogen reduction had only one step of mass loss and the mass loss rate was from 5.91% to 6.36%.The main products of the reaction were NaCrO2 and NaOH,as confirmed by XRD patterns of the reduction products.The non-isothermal TGA measurements of hydrogen reduction was investigated at six different temperature rising rates of 1,5,10,15,20 and 30 K·min-1.According to the Doyle-Ozawa and Kissinger methods,the activation energy was 342.47 kJ·mol-1 and the order of reduction reaction was 0.87.The results in this work will help to enhance the reaction efficiency and optimize the process flow.展开更多
根据专利及相关文献,介绍了铬盐的新用途,即以亚铬酸钠为正极活性物质的熔盐蓄电池。熔盐电池制备方法:以亚铬酸钠为熔盐电池的正极活性物质,以锡钠合金或锌钠合金为负极活性物质,夹在两种活性物质之间的隔膜采用事先含浸了二氟磺酰胺钠...根据专利及相关文献,介绍了铬盐的新用途,即以亚铬酸钠为正极活性物质的熔盐蓄电池。熔盐电池制备方法:以亚铬酸钠为熔盐电池的正极活性物质,以锡钠合金或锌钠合金为负极活性物质,夹在两种活性物质之间的隔膜采用事先含浸了二氟磺酰胺钠-二氟磺酰胺钾熔融盐的玻璃布。熔盐电池性能:放电容量高,能量密度达到290 W·h/L,是同体积锂电池的2倍;比容量为124 m A·h/g,充放电1 000次后电池容量仍有76%。熔盐电池应用领域:由于熔盐电池需保持温度为80℃才可正常工作,因此可用于需要长期不间断工作的领域,如家庭供电、电动汽车以及办公楼和工厂的备用电源。并且介绍了亚铬酸钠的制备方法。展开更多
文摘The environmental problem resulting from the traditional production process of chromic oxide has spawned public concerns all over the world.Integrated in the clean production technology of chromium compounds with sub-molten salt media,the preparation process of chromic oxide through hydrogen reduction of alkali metal chromate salt enables the clean and short-route preparation of chromic oxide.Moreover,the alkali metal hydroxide byproducts can be recycled as reaction media inside the process.To explore the reaction kinetics and mechanisms of the hydrogen reduction process,the reduction of sodium chromate in H2 atmosphere was investigated by using TGA and DSC techniques.The isothermal TGA measurement results showed that in the temperature range from 703 K to 773 K,the hydrogen reduction had only one step of mass loss and the mass loss rate was from 5.91% to 6.36%.The main products of the reaction were NaCrO2 and NaOH,as confirmed by XRD patterns of the reduction products.The non-isothermal TGA measurements of hydrogen reduction was investigated at six different temperature rising rates of 1,5,10,15,20 and 30 K·min-1.According to the Doyle-Ozawa and Kissinger methods,the activation energy was 342.47 kJ·mol-1 and the order of reduction reaction was 0.87.The results in this work will help to enhance the reaction efficiency and optimize the process flow.
文摘根据专利及相关文献,介绍了铬盐的新用途,即以亚铬酸钠为正极活性物质的熔盐蓄电池。熔盐电池制备方法:以亚铬酸钠为熔盐电池的正极活性物质,以锡钠合金或锌钠合金为负极活性物质,夹在两种活性物质之间的隔膜采用事先含浸了二氟磺酰胺钠-二氟磺酰胺钾熔融盐的玻璃布。熔盐电池性能:放电容量高,能量密度达到290 W·h/L,是同体积锂电池的2倍;比容量为124 m A·h/g,充放电1 000次后电池容量仍有76%。熔盐电池应用领域:由于熔盐电池需保持温度为80℃才可正常工作,因此可用于需要长期不间断工作的领域,如家庭供电、电动汽车以及办公楼和工厂的备用电源。并且介绍了亚铬酸钠的制备方法。
