目的采用气相色谱法测定注射用丙戊酸钠中2-甲基戊酸的含量。方法样品依次用水溶解、稀硫酸酸化、正庚烷萃取;采用DB-FFAP色谱柱(30 m×0.53 mm, 1.50μm),程序升温,火焰离子化检测器检测,不分流进样;以苯乙酸乙酯为内标物,按内标...目的采用气相色谱法测定注射用丙戊酸钠中2-甲基戊酸的含量。方法样品依次用水溶解、稀硫酸酸化、正庚烷萃取;采用DB-FFAP色谱柱(30 m×0.53 mm, 1.50μm),程序升温,火焰离子化检测器检测,不分流进样;以苯乙酸乙酯为内标物,按内标法以峰面积计算含量。结果 0.5245~10.49μg·mL^(-1) 2-甲基戊酸呈良好的线性关系(r=0.9992),定量限为0.3μg·mL^(-1),平均回收率为101.1%,RSD=3.22%。结论所用方法准确度好、专属性强,可以用于注射用丙戊酸钠中2-甲基戊酸的含量测定。展开更多
利用同步热分析仪,采用程序升温法研究了生物质焦CO_2气化反应速率特性,主要考察了升温速率对生物质焦气化反应性的影响,并用Friedman-Reich-Levi法对其动力学参数进行了计算。结果表明:DTG曲线峰值温度和最大反应速率随着升温速率的增...利用同步热分析仪,采用程序升温法研究了生物质焦CO_2气化反应速率特性,主要考察了升温速率对生物质焦气化反应性的影响,并用Friedman-Reich-Levi法对其动力学参数进行了计算。结果表明:DTG曲线峰值温度和最大反应速率随着升温速率的增大而增大;以二氧化碳作保护气,改变升温速率,当升温速率为15℃/min时,热解得到的生物质焦的反应活性最好,即气化速率最快;升温速率越大,反应速率随着温度的变化越明显;生物质焦气化阶段的活化能在-4 984.41~1 408.39 k J/mol之间变化,气化的反应过程复杂。展开更多
The catalytic activities of the supported PdO catalysts were found to be dependenton the kind of the support as follows: CeO2>ZrO2>TiO2>Al2O3>SnO2>ZSM-5>SiO2.The reduction state of PdO in the catalys...The catalytic activities of the supported PdO catalysts were found to be dependenton the kind of the support as follows: CeO2>ZrO2>TiO2>Al2O3>SnO2>ZSM-5>SiO2.The reduction state of PdO in the catalyst played an important role in the oxidation activityof the catalyst. PdO/CeO2 was inferior to PdO/Al2O3 in heat-stability, but its activity for COoxidation was higher than PdO/Al2O3, after it had been calcinated at 1200 ℃ for 4 h.展开更多
文摘利用同步热分析仪,采用程序升温法研究了生物质焦CO_2气化反应速率特性,主要考察了升温速率对生物质焦气化反应性的影响,并用Friedman-Reich-Levi法对其动力学参数进行了计算。结果表明:DTG曲线峰值温度和最大反应速率随着升温速率的增大而增大;以二氧化碳作保护气,改变升温速率,当升温速率为15℃/min时,热解得到的生物质焦的反应活性最好,即气化速率最快;升温速率越大,反应速率随着温度的变化越明显;生物质焦气化阶段的活化能在-4 984.41~1 408.39 k J/mol之间变化,气化的反应过程复杂。
文摘The catalytic activities of the supported PdO catalysts were found to be dependenton the kind of the support as follows: CeO2>ZrO2>TiO2>Al2O3>SnO2>ZSM-5>SiO2.The reduction state of PdO in the catalyst played an important role in the oxidation activityof the catalyst. PdO/CeO2 was inferior to PdO/Al2O3 in heat-stability, but its activity for COoxidation was higher than PdO/Al2O3, after it had been calcinated at 1200 ℃ for 4 h.
