The Synergy Mechanism Of Nickel And Alkali Metal Postssium In Acetic Acid Steam Reforming Process

In this paper, the mechanism of synergistic effect between nickel and alkali metals in the steam reforming of acetic was studied on cheap nickel-based catalysts. Nickel, alkali metals, alkaline-earth metals and char were contained and worked as the active components of the catalysts when lignite was used as the support due to its characteristic. The components of lignite was very complex. For further discussions of the reaction mechanism, activated carbon with a high specific surface area was used as a model and potassium was added to simulate the alkali metals in lignite.Acetic was one of the main components in bio-oil and studied as a model compound in this paper to analyze the mechanism in the steam reforming of bio-oil for hydrogen as well as optimize the catalyst performance. Ni/AC and Ni-K/AC catalysts were prepared by a traditional impregnation method. The characteristics of the catalysts were measured by nitrogen adsorption (BET), X-ray diffraction (XRD) and temperatured programmed reducion (TPR). Influences of reaction tempreture, potassium content for the steam reforming of acetic were investigated in the experiment. The results showed the catalyst activity or selectivity for reaction could be enhanced by adding an appropriate content potassium.Use Ms to make theoretical calculations, combining theoretical calculation and experimental study, to analyze surface adsorption energy, the PDOS and Mulliken layout in the case of acetic acid occupy different adsorption sites of Ni (111) surface. It will provide further experimental and theoretical basis in the field of nickel-loaded lignite catalysts in biomass reforming hydrogen oil.