| The amorphous alloy is a kind of new material with short-range ordering whilelong-range disordering structure. Its unique structural character results in the excellentcatalytic properties, such as the surface isotropic, highly unsaturated coordinated atoms andhigh surface energy, which is a new green catalytic material in the21century. Rareearth-based amorphous alloys have high glass-forming ability, wide supercooled liquid regionand higher thermal stability. So they are the ideal alloy systems to study the amorphous alloyadsorption characteristics and catalytic behaviors.The composition was designed on cluster structure model, deep eutectic point law aswell as similar atoms replace rule. The Ce-La-Ni-Al alloy was designed and prepared fromCe-Ni binary alloy phase diagram. The phase compositon and the thermal stability wereanalyzed by XRD and DTA. The amorphous powder was prepared and activated by aceticacid as activator. The specific surface area, particle size, pore size, morphology and surfaceelectronic form of before and after the activation amorphous alloy powder were studied bySEM, XPS, laser particle size analyzer, specific surface area and pore size analyzer and othermethods.The results show that the Ce-La-Ni-Al amorphous alloy has high glass-formingability(GFA), wide supercooled liquided region and good thermal stability. The Trg(Trg=Tg/Tl)ranged from0.5524to0.5739, the γ ranged from0.4123to0.4246, the Txranged from73Kto76K respectively, while the contents of La is changed from0.3and0.8. The(Ce0.2La0.8)58.3Ni16.7Al25amorphous powder prepared by mechanical disruption and high-energy ball milling method remains the phase structure of bulk amorphous state. Andthe powder has uniform particle size, smooth surface, regular in shape and no reuniondefects.The specific surface area reaches105m2/g after acetic acid activation treatment. And thesurface structure is loosened with cotton shaped which is uniformly distributed with porestructure. A great deal of collapse and slit hole are well dispersed and no obviousagglomeration is appeared. The pore size is in the range of4-6nm. The adsorption-desorptionisotherms obtained is type Ⅳ, the pore structure is mainly composed of blind hole closed atend which is not generated by a large number of adsorption hysteresis loop and cracks holesor slits hole which partly produced H3or H4class hysteresis loop. And a porous structure asa skeleton with Ni/Al is formed after activation, wherein Ni existes at high oxidation state asadsorption centers which is used to enrich electronics, while Al existes at reduction statewhich is used to lose electrons and provide the unsaturated center. The residue of Ce and Laare+3prices and dispersed in the porous structure which has a high reaction activity. |
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