甘油在改性Ni/γ-Al_2O_3催化剂上水蒸气重整制氢的研究  

Hydrogen production by steam reforming of glycerol over modified Ni/γ-Al_2O_3 catalysts

作　　者：于乃超[1,2] 汪丛伟[1] 阴秀丽[1] 吴创之[1] 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源与天然气水合物重点实验室,广东广州510640 [2]中国科学院大学,北京100049

出　　处：《现代化工》2013年第8期78-82,共5页Modern Chemical Industry

基　　金：国家自然科学基金(51006111);广东省自然科学基金博士启动项目(9451007006004084)

摘　　要：通过催化剂性能评价,考察了助剂CeO2、CaO和La2O3对催化剂Ni/γ-Al2O3催化性能的影响,发现Ni/γ-Al2O3经3种助剂修饰后催化剂活性都明显提高,其中La2O3修饰后的催化剂活性最高,甘油转化率在450～650℃内一直保持100%;氢气选择性在450℃时即达到85%,而且随着温度升高逐渐变大并趋于平稳,最高时可达到92.37%。同时考察了温度、甘油溶液浓度、空速对甘油水蒸气重整制氢反应的影响。运用NH3-TPD和TPR对催化剂进行了表征,发现助剂的添加降低了催化剂的酸性,经改性后催化剂中NiAl2O4相含量明显降低;催化剂中加入La2O3降低了Ni与Al2O3载体之间的相互作用,因此有利于甘油水蒸气重整制氢反应。Hydrogen production from glycerol steam reforming has been investigated over Ni/γ-Al2O3 catalysts modified by CeO2,CaO and La2O3.The results show that all of the catalyst activities are improved after they are promoted by the additives.The catalytic activity of the NiLaγ catalyst is the best.The glycerol is converted into gas phase product completely and the selectivity of hydrogen is 85％ at the temperature of 450℃.The selectivity of hydrogen is increasing and tends to be stable with increasing the temperature.The highest of that can reach 92.37％.The influences of temperature,glycerol solution concentration and space velocity on the reaction are investigated.It is proved by NH3-TPD and TPR analysis that the additives reduce the catalyst acidity and decrease the content of NiAl2O4 phase.The addition of La2O3 reduces the interaction between NiO and Al2O3,which is good for glycerin hydrogen production from steam reforming reaction.

关 键 词：甘油 水蒸气重整 制氢 改性Ni催化剂 LA2O3 

分 类 号：O643[理学—物理化学] TQ51[理学—化学]