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In Situ Raman Spectroscopy Study on Dissociation of Methane at High Temperatures and at High Pressures 下载免费PDF全文
We investigate the stability and dissociation of methane, which is the most abundant organic molecule in the universe, using diamond anvil cell (DAC) with in situ Raman spectroscopy up to 903K and 21 GPa. At the temperatures of 793 and 723 K and the corresponding pressures of 16.15 and 20.30 GPa, methane dissociates to form carbon 'soot' and heavier hydrocarbons involving C=C and C≡C bonds. However, if the pressure is not very high, methane remains stability up to the highest temperature of 903 K of the work. The four symmetric C-H bonds of methane split at high temperatures and at high pressures, and there is at least one phase transition of crystalline symmetry from face centred cubic (fcc) to hexagonal close packed (hcp) before dissociation. 相似文献
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氮掺杂碳纳米管修饰电极的电化学行为 总被引:1,自引:0,他引:1
制备了氮掺杂改性的碳纳米管, 并用循环伏安法(CV)测定了多巴胺(DA)和抗坏血酸(AA)在不同氮含量的碳纳米管修饰电极上的电化学行为. 结果表明, 氮掺杂碳纳米管修饰电极对AA和DA有不同的电催化行为, 其中高氮含量修饰电极对AA的催化作用强, 而低氮含量修饰电极对DA的催化作用强. 微分脉冲伏安法(DPV)的结果显示, DA的氧化峰电流与其浓度在5.0×10-6~2.0×10-4 mol/L范围内呈良好的线性关系, 检出限达1.64×10-6 mol/L (S/N=3); AA氧化峰电流与其浓度在3.0×10-5~1.0×10-2 mol/L范围内呈良好的线性关系, 检出限达3.26×10-6 mol/L (S/N=3). 该修饰电极在AA大量存在(AA浓度为DA浓度两万倍)时可选择性地实现多巴胺的测定而不造成干扰. 相似文献
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