Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetr...Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetric results and exchange isotherm determined by static method. The adsorption of aluminum on Na-montmorillonite is endothermic, and therefore exchange reaction is a process driven by entropy. X-ray diffraction patterns of montmorillonite saturated by Na+ and Al3+ are determined at wet and dry state respectively. The reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.展开更多
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...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。展开更多
文摘Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetric results and exchange isotherm determined by static method. The adsorption of aluminum on Na-montmorillonite is endothermic, and therefore exchange reaction is a process driven by entropy. X-ray diffraction patterns of montmorillonite saturated by Na+ and Al3+ are determined at wet and dry state respectively. The reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.
文摘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。