无模板剂一锅法合成介孔Ni-CaO-ZrO2 催化剂及其在CH4-CO2重整反应中的应用研究

通过无模板剂一锅法制备出一种具有较大比表面积和孔容的介孔Ni-CaO-ZrO₂催化剂,并将其用于CH₄-CO₂重整反应过程。利用N₂吸附-脱附(BET)、SEM、TEM、X射线粉末衍射(XRD)、程序升温还原(H₂-TPR)以及热重(TG)等手段对催化剂进行了表征。结果表明,该催化剂具有较强的金属-载体相互作用,这种强金属-载体相互作用(SMSI)使Ni与载体紧密接触,有利于吸附物种在界面进行快速反应,使催化剂在反应过程中具有较高的反应活性和稳定性。虽然反应后的催化剂表面有一定量的积炭生成,但这些积炭多以丝状碳为主,并不会覆盖催化剂的活性位点。

Template-free one-pot synthesis of mesoporous Ni-CaO-ZrO2 catalyst and its application in CH4-CO2 reforming

A novel mesoporous Ni-CaO-ZrO₂ catalyst with high surface area and pore volume was prepared by one-pot template-free method and applied in CH₄-CO₂ reforming. The mesoporous Ni-CaO-ZrO₂ catalyst was characterized by means of nitrogen sorption, SEM, TEM, XRD, H₂-TPR and TG-DSC. The results indicated that a strong metal support interaction (SMSI) present in the Ni-CaO-ZrO₂ catalyst induces an intimate contact between Ni and ZrO₂ nano-particles, which is favorable for the surface reaction of adsorbed reactant species for CH₄-CO₂ reforming. Owing to the mesoporous framework and SMSI, the Ni-CaO-ZrO₂ catalyst shows promising activity and stability in CH₄-CO₂ reforming. Most of the carbonaceous deposits on the catalyst surface are in whisker form, which does not cover the active sites and then has little influence on the catalyst stability.