甘油水蒸汽重整制氢Ni/Ce0.9Gd0.1O1.95催化剂的研究

采用浸渍法和共沉淀法制备了Ni质量分数10%的10%Ni/Ce_0.9Gd_0.1O_1.95催化剂,通过X射线衍射、N₂物理吸附与H₂脉冲化学吸附、H₂程序升温还原等技术表征了催化剂的结构和性质,并考察了其催化甘油水蒸汽重整制氢反应性能。结果表明,浸渍法制备的10%Ni/Ce_0.9Gd_0.1O_1.95-S催化剂的活性最佳,该催化剂上Ni晶粒小、分散度高,形成氧空穴使得催化剂抗积炭能力大大提高,所以活性、氢气选择性较高,稳定性也较好。同时考察了水与甘油物质的量比和泵流速对甘油重整反应性能的影响,发现在水与甘油物质的量比为24:1,泵流速为0.06 mL·min^-1的条件下,甘油几乎完全转化,氢气选择性也非常高,而且反应10 h没有失活。

Study on Ni/Ce0.9Gd0.1O1.95 catalyst for hydrogen production from glycerol steam reforming

10wt%Ni/Ce_0.9Gd_0.1O_1.95 catalysts were prepared by dipping method and coprecipitation method.The structures and properties of these catalysts were characterized by X-ray diffraction,N₂ physical adsorption and H₂ pulsed chemical adsorption,and H₂ temperature-programmed reduction.Catalysts performance in catalyzing the steam reforming of glycerol to hydrogen were investigated.It was found that the 10wt%Ni/Ce_0.9Gd_0.1O_1.95-S catalyst prepared by the dipping method had the best activity.The catalyst had small Ni grains and high dispersion that form the oxygen vacancies which could greatly improve the resistance of the catalyst to carbon deposition.Therefore,its activity and hydrogen selectivity were high,and its stability was good.At the same time,the effects of the molar ratio of water glycerin and the pump flow rate on the performance of glycerol reforming were investigated.It was found that under the condition of a molar ratio of water glycerin of 24:1,and a pump flow rate of 0.06 mL·min^-1,glycerin was almost completely converted,the hydrogen selectivity was very high,and there was no inactivation after 10 hours of reaction.