氢燃料电池被认为是未来最有前景的能源技术之一,通过液体甲醇现场重整制氢可有效解决氢气储存和运输等技术瓶颈。文中设计加工了板式微反应器并搭建了配套的制氢系统,制备了具有自还原特性的新型网状CuNi(Fe)/γ-Al 2 O 3/Al结构化催...氢燃料电池被认为是未来最有前景的能源技术之一,通过液体甲醇现场重整制氢可有效解决氢气储存和运输等技术瓶颈。文中设计加工了板式微反应器并搭建了配套的制氢系统,制备了具有自还原特性的新型网状CuNi(Fe)/γ-Al 2 O 3/Al结构化催化剂。以甲醇为原料,实验研究了自制催化剂在微反应器与管式固定床反应器中的催化性能,并与商用CuZn催化剂进行了性能对比。结果表明:与管式反应器相比,微反应器能更好地发挥催化剂的低温活性。开发的CuNiFe结构化催化剂在10000 mL/(g·h)空速下仍能保持82.3%的甲醇转化率,单位质量催化剂的产氢量可达商用催化剂的2.62倍。使用自制催化剂,制氢系统冷态启动40 min可达到甲醇转化率100%的稳定产氢,显著低于使用商用催化剂结果。展开更多
Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters b...Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters both a and c of M gAl-LDH are smaller than that of MgFe-LDH though their structures are simila r, and MgAl-LDH with higher crystallinity is more easily formed than MgFe-LD H in the same preparing conditions. The IR analyses manifest that the structures of layer sheets and the orderings of the anions in the interlayer regions of Mg Al-LDH are more regular than that of MgFe-LDH. The temperature programmed XR D analyses reveal that the diffraction peak of 003 reflections for MgAl-LDH co uld be seen after calcining at 300℃, while this peak for MgFe-LDH disappears after calcining at 200℃. Together with the TG-DTA analysis it can be conclu ded that the thermal stability of MgAl-LDH is obviously higher than that of Mg Fe-LDH.展开更多
文摘Layered Double Hydroxides MgFe-LDH and MgAl-LDH have been prepared by th e method involving separate nucleation and ageing steps. The structure analyses for these two materials show that the values of the parameters both a and c of M gAl-LDH are smaller than that of MgFe-LDH though their structures are simila r, and MgAl-LDH with higher crystallinity is more easily formed than MgFe-LD H in the same preparing conditions. The IR analyses manifest that the structures of layer sheets and the orderings of the anions in the interlayer regions of Mg Al-LDH are more regular than that of MgFe-LDH. The temperature programmed XR D analyses reveal that the diffraction peak of 003 reflections for MgAl-LDH co uld be seen after calcining at 300℃, while this peak for MgFe-LDH disappears after calcining at 200℃. Together with the TG-DTA analysis it can be conclu ded that the thermal stability of MgAl-LDH is obviously higher than that of Mg Fe-LDH.
