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使用原位穆斯堡尔谱研究了非担载铁氧化物和不同担载量的铁/活性炭催化剂在不同温度下的还原,详细分析了活性炭载体上高分散超顺磁铁物类的穆斯堡尔谱。还原前铁/活性炭催化剂中的铁物类为结构松散的α-Fe_2O_3和没有充分脱水的氧化铁,铁的担载量不很小时可经Fe_3O_4还原到金属态,但活性炭载体可稳定Fe~(3+)使之难以还原,在500℃氢气中大部分铁才还原为金属。铁的担载量很小时,其还原以Fe~(2+)为中间产物,0.2%Fe/AC氢气化剂在500℃氢气还原18小时生成磁分裂金属铁和超顺磁金属铁(δ=0.37mm/s,△=0,H=0),其正的同质异能移表示了铁-活性炭间的电荷转移。
In situ Mossbauer spectroscopy was used to study the reduction of iron-activated carbon catalysts with different supported iron oxides and different loadings at different temperatures. In detail, the Mohsbourg The spectrum. The iron species in the pre-reduction iron / activated carbon catalyst are loosely structured α-Fe 2 O 3 and insufficiently dehydrated iron oxide. Fe can be reduced to the metal state by Fe 3 O 4 when the supported amount of iron is not very small, but the activated carbon support can stabilize Fe 3+) make it hard to restore most of the iron in the hydrogen at 500 ° C before being reduced to metal. When the iron loading is small, the reduction takes Fe 2+ as the intermediate product and the 0.2% Fe / AC hydrogenation agent reduces hydrogen to 500 ° C for 18 hours to generate magnetic split metal and super-paramagnetic metal iron (δ = 0.37 mm / s, Δ = 0, H = 0), and its positive isomorphism shifts the charge transfer between iron and activated carbon.