Ni-Cu/蒙脱土乙醇水蒸气重整制氢催化剂性能研究

Performance of Catalysts Ni-Cu/Montmorillonite for Preparation of Hydrogen from Ethanol Steam Reforming

生物乙醇重整制氢是一种具有良好应用前景的制氢技术,是当前低碳能源领域的研究热点。本文采用离子交换法制备了Ni-Cu/蒙脱土双金属催化剂,并将其应用于乙醇水蒸气重整制氢。采用X射线衍射(XRD)、比表面积测定(BET)、H2-程序升温还原(H2-TPR)和透射电子显微镜(TEM)等表征手段对催化剂的物相结构、织构性质、还原性能、微观形貌等进行了研究。结果表明:Ni、Cu均为乙醇水蒸气重整制氢的活性组分,铜的加入可以减少镍颗粒的尺寸、优化镍组分的分布状态。此外,Ni-Cu双金属催化剂的双功能特性使其优于单一金属催化剂。Ni-Cu/蒙脱土在焙烧温度500℃、水醇比为8∶1、空速为80000 m L/gcat·h,反应进行10 h后,仍保持72.09%的氢气的选择性,说明Ni-Cu/蒙脱土双金属催化剂在乙醇水蒸气重整制氢中具有良好的催化活性和稳定性。

Bio-ethanol reforming is a type of promising technology for hydrogen production, which is focused on current low-carbon energy research. Ni-Cu/montmorillonite catalysts were prepared by ion- exchanged method and applied for ethanol steam reforming （ESR） to produce hydrogen. The structure and surface characteristics of these catalysts were analyzed by X ray diffraction （XRD）, Brunauer- Emmett-Teller （BET）, H2 temperature programmed reduction （Hz-TPR）, and transmission electron microscopy （TEM）. It was revealed that both copper and nickel were active components during ESR. Copper addition improved nickel dispersion to obtain small nickel crystallites, The results showed that the catalytic activity of Ni-Cu/Montmorillonite bimetallic catalyst is superior to single metal catalysts. The optimal catalytic performance could be obtained under the conditions of calcinated temperature 500 ℃, water to ethanol ratio 8：1 and space velocity 80,000 mL/gcat · h. During 10 h durability testing, the Ni- Cu/montmorillonite maintained about 72.09% n2 selectivity, so its a excellent catalysts for ESR.