乙酸自热重整制氢用类水滑石衍生Zn-Ni-Al-Fe-O催化剂研究

Layered double hydroxide-derived catalyst of Zn-Ni-Al-Fe-O for hydrogen production via auto-thermal reforming of acetic acid

摘要: 采用共沉淀法制备了Zn_2.4Ni_0.6Al_xFe_1-xO_4.5±δ（x=1/0.5/0）系列类水滑石型镍基催化剂，用于乙酸自热重整制氢，并利用XRD、H₂-TPR、BET、XPS等表征手段对催化剂进行了表征。结果表明，Zn_2.4Ni_0.6Al_0.5Fe_0.5O_4.5±δ催化剂在乙酸自热重整中乙酸转化率维持在100%，氢气产率为2.39 mol-H₂/mol-HAc。Zn-Al水滑石前驱体经焙烧后形成了ZnO为骨架的复合氧化物，铁的适量添加增大了催化剂的比表面积，经还原后形成FeNiZn合金，Fe以及Zn的给电子作用提高了Ni的抗氧化能力，催化剂的抗氧化烧结和抗积炭能力得到提高。

Abstract: Zn_2.4Ni_0.6Al_xFe_1-xO_4.5±δ catalysts were prepared by co-precipitation, tested in auto-thermal reforming (ATR) of HAc, and characterized by XRD, H₂-TPR, BET and XPS. The result showed that the Zn_2.4Ni_0.6Al_0.5Fe_0.5O_4.5±δ catalyst presented a better performance in ATR of HAc. The HAc conversion and hydrogen yield remained at 100% and 2.39 mol-H₂/mol-HAc, respectively. The characterization results indicated that the better performance can be attributed to the addition of Fe, which was helpful to increase surface area and formation of FeNiZn alloy after reduction, while resistance to oxidation and coking was improved as well.