Preparation, Composition And Performance Of Iron-Nickel Nanosized Alloy

Fe-Ni nano-alloy has been synthesized by reducing mixture solution of Fe²⁺. Ni²⁺ with KBH₄ as reducer and polyethylene glycol as dispersant. TEM shows crystal-palpus length is 200-400 nm, diameter is 2⁴ nm. Nano-micropowder has been oxidated in the course of preparation because of high-specific surface area and small particle. Surface activity of alloy can be improved by hydrogen reduction. XRD shows nanometer alloy which is not reduced by hydrogen is amorphous. The alloy begins to turn into crystal at 250℃, is sintered at 450℃ and entirely becomes agglomeration at 700 ℃. The alloy has excellent catalytic performance and its surface energy is the highest when reduction temperature is 400 ℃. Existing form of every element in the Fe-Ni nano-alloy of different mole-proportion presents regular transformation and the main phase of alloy is Fe₃Ni₃B.Fe³⁺ forms a stable deep purple complex with EDTA and H₂O₂. Ni²⁺ forms a red complx with diacetyl dioxime in the presence of aqueous ammonia and an oxidizer. Thus, the amount of Fe³⁺ and Ni²⁺ can be determined by the absorbance of their complexes at 519 nm and 536 nm, respectively. Boron content is determined by fortifying method of weak acid with mannitol as fortifier. Results of elemental analysis show the alloy is Fe-Ni-B-O nano-alloy and both mass percentage of boron and nickel increase linearly with the decrease of iron content in the alloy.The performance of Fe-Ni nano-alloy of different mole-proportion catalyzing hydrogen production from KBH₄ has been studied. Hydrogen generation rate can approach 100% especially when pH is 8. It increases obviously with the increase of nickel content in the Fe-Ni nano-alloy of different mole-proportion. Hydrogen generation rate is the best when Fe/Ni≤1 and the alloy exceeds Ni_xB on catalytic performance at this time. Fe-Ni-B/TiO₂ nano-alloy exhibits samely good catalytic performance. Hydrogen production rate and speed rate can arrive at the most when nitrate solution of Fe²⁺,Ni²⁺ is dipping solution and dipping times are 3.Fe-Ni nano-alloy can react with carbon chloride in the condition of hot spot and the products are FeCl₂,NiCl₂,Cl₂ and Fe_xC. XRD result shows the main...