负载Ni催化剂上低温甘油蒸汽重整制氢

吕衍安; 赵星岭; 索掌怀; 廖卫平; 金明善

负载Ni催化剂上低温甘油蒸汽重整制氢

烟台大学应用催化研究所, 山东烟台 264005

基金项目: 国家自然科学基金(21273193);山东省自然科学基金(ZR2011BM024)。

详细信息

通讯作者:
索掌怀,Tel:0535-6902514,E-mail:zhsuo@ytu.edu.cn。

中图分类号: O643
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- 被引次数: 0
出版历程
- 收稿日期: 2014-12-19
- 修回日期: 2015-03-21
- 刊出日期: 2015-06-30

Low-temperature steam reforming of glycerol for hydrogen production over supported nickel catalysts

Institute of Applied Catalysis, Yantai University, Yantai 264005, China

摘要

摘要: 采用等体积浸渍法制备了Al₂O₃、CeO₂、TiO₂及MgO负载Ni催化剂,考察了它们对甘油蒸汽重整制氢反应的催化性能。采用X射线衍射、N₂吸附、透射电镜及H₂程序升温还原等方法对催化剂进行了表征。结果表明,载体对Ni催化剂的活性有显著影响。在400 ℃下Ni/CeO₂的催化活性明显好于其他催化剂,活性次序为Ni/CeO₂> Ni/Al₂O₃> Ni/TiO₂ ~ Ni/MgO。Ni/CeO₂也具有好的稳定性,反应20 h未见活性下降,甘油转化率70%,氢气收率69.2%。这与CeO₂的本性及其与活性组分的相互作用有关。Al₂O₃具有较大的比表面积与孔体积,有利于CO吸附及甲烷化反应的进行,使得Ni/Al₂O₃催化剂在较高温度下具有很高的甘油转化率85.7%,但H₂选择性较差。由于MgO载体与活性组分强的相互作用而生成NiMgO₂固溶体,导致Ni/MgO低温活性差。
- 甘油 /
- 蒸汽重整 /
- 制氢 /
- 负载Ni催化剂
Abstract: Al₂O₃, CeO₂, TiO₂ and MgO supported Ni catalysts were prepared by incipient impregnation. The activities in glycerol steam reforming to hydrogen production were evaluated at 300~500 ℃. The catalysts were characterized by XRD, N₂ adsorption, TEM, and H₂-TPR techniques. A strong effect of support on the activity of Ni catalyst was detected. Ni/CeO₂ catalyst gives the highest activity among all catalysts at 400 ℃and the following activity order is shown Ni/CeO₂> Ni/Al₂O₃> Ni/TiO₂ ~ Ni/MgO. On Ni/CeO₂, there was almost no deactivation detected after 20 h reaction with 70% conversion of glycerol and 69.2% H₂ yield. Good activity and stability of the catalyst is attributed to the intrinsic property of CeO₂ and strong interaction between CeO₂ and active nickel species. Relatively high glycerol conversion (85.7%) with low H₂ selectivity on Ni/Al₂O₃catalyst at 500 ℃ is achieved due to its high surface area and large pore volume. The formation of solid solution NiMgO₂phase observed in Ni/MgO catalyst does not show the desired activity at low temperatures though it enhanced the interactions between active phase and the support. Base oxide supports (CeO₂, MgO) seem to be more effective than acid oxide supports in preventing the formation of CO and CH₄ as by-products.
- glycerol /
- steam reforming /
- hydrogen production /
- supported nickel catalyst

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参考文献(23)

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