碱木质素在超临界水中Ru/C纳米管催化气化的降解研究

Study on the catalytic gasification of alkali lignin over Ru/C nanotubes in supercritical water

针对碱木质素难降解的特点,在间歇式反应器中,以Ru/C纳米管为催化剂,对碱木质素在超临界水中的气化进行研究。分别探讨了碱木质素在不同温度、水密度、反应时间、反应浓度、催化剂量的影响,并且分析了Ru/C纳米管催化剂的催化效率。通过单因素实验分析,确定了Ru/C纳米管催化剂催化气化碱木质素的最佳反应条件为,反应温度600℃、水密度0.128 4 g/cm3、反应时间60 min、反应质量分数3.0%、催化剂量0.5 g/g(碱木质素)。结果表明,碱木质素在超临界水气化过程中,高温、高水密度(或压力)、长反应时间、低反应物浓度及适量的催化剂将更有利于碱木质素的气化。在最佳反应条件下碱木质素的气化率和碳气化率分别达到73.74%和56.34%,且制氢能力也得到明显提高。

Aiming at the refractory characteristics of alkali lignin, the study on the gasification of alkali lignin in supercritical water was carded out in a batch reactor with Ru/C nanotubes as the catalyst. The effect of temperature, water density, time, concentration of the reactant, catalyst amount on the gasification of alkali lignin was discussed, as well as the catalytic efficiency of the Ru/C catalyst nanotubes. The optimum conditions of the catalytic gasification of alkali lignin on the Ru/C nanotubes obtained with single factor analysis were the reaction temperature of 600 ℃, 0. 128 4 g/cm3 water density, 60 min reaction time, 3. 0% reactant concentration, catalyst amount of 0.5 g/g （alkali lignin）. The results show that during the gasification process of alkali lignin in supercfitical water, the high temperature, high water density （or pressure）, long reaction time, low reactant concentration and fight amount of catalyst will be in favor of the gasification reaction. The alkali lignin gasification efficiency and carbon gasification efficiency reached 73.74% and 56.34% under the optimal reaction conditions, and the hydrogen production capacity was also significantly improved.