基于Cu-Zn/Al_2O_3-ZrO_2催化剂的甲醇水蒸汽重整制氢试验

模拟内燃机尾气余热在非贵金属催化剂Cu-Zn/Al2O3-ZrO2的作用下,进行甲醇水蒸汽重整制氢试验.采用自行设计的燃料重整制氢装置,通过调整燃料重整的试验条件来提高产氢率,并得到较优的重整制氢方案.结果表明:反应温度是甲醇水蒸汽重整反应中最关键的因素,重整气中氢气的体积分数随着温度的升高而逐渐加大.空速会直接影响反应原料滞留在催化剂表面的时间,因此空速为最小值376 h-1时,重整制氢效果更好.最佳的水醇物质的量比和原料流量分别为6∶1和0.4 mL/min.在最佳的试验条件组合下,当反应温度为600℃时,重整气中氢气的体积分数可以达到56.61%.因此,基于Cu-Zn/Al2O3-ZrO2催化剂的车载甲醇水蒸汽重整制氢技术具有实际应用的可行性.

Steam Reforming of Methanol to Produce Hydrogen Over Cu-Zn/Al2O3-ZrO2 Catalyst

This study carries out the methanol steam reforming to produce hydrogen with the simulated engine exhaust heat over non-noble Cu-Zn/Al2O3-ZrO2 catalyst.An apparatus was designed to complete catalytic reforming experiments,and multiple parameters were adjusted to improve the hydrogen yield and find the better reforming method.The results showed that the reaction temperature was the key factor in the methanol steam reforming.The hydrogen volume fraction in syngas increased with the increase of temperature.Meanwhile,the gas hourly speed velocity could affect the residence time directly of methanol vapor on the surface of the catalysts.Therefore,the effect of reforming was better when the gas hourly speed velocity achieved to minimum: 376 h-1.And the optimal water methanol molar ratio and feedstock flow rate were 6∶ 1 and 0.4 mL/min,respectively.When the reaction temperature was 600 ℃,the hydrogen volume fraction in the reformed gas could achieve to 56.61% at the best conditions.Thus,the steam reforming of methanol over Cu-Zn/Al2O3-ZrO2 catalyst may become a promising and practical way for producing hydrogen on vehicles.