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使用原位穆斯堡尔谱考察了具有不同担载量的Fe/AC以及Fe-K/AC和Fe-Mn/AC催化剂在300℃合成气(H_2/CO=2)中的碳化行为。发现在活性炭载体上铁的担载量(或分散度)制约着碳化时生成的碳化铁的种类。铁的粒径很小(～30A)时生成ε’-Fe_(2·2)C碳化铁,铁的粒径在70A左右可生成ε-Fe_2C碳化铁,而大粒子铁(>200A)和体相铁则生成x-Fe_5C_2碳化铁,Fe-K/AC和Fe-Mn/AC催化剂在碳化时生成的碳化铁种类仍受铁的粒径制约,助剂K和Mn不影响生成的碳化铁的种类,但Mn可延缓铁的碳化。
In-situ Mossbauer spectroscopy was used to investigate the carbonation behavior of Fe / AC with different loadings and Fe-K / AC and Fe-Mn / AC catalysts in 300 ℃ syngas (H 2 / CO = 2). It has been found that the amount of iron supported on the activated carbon support (or dispersion) restricts the type of iron carbide produced during carbonization. When the iron particle size is small (~ 30A), ε’-Fe_ (2.2) C iron carbide is formed. When the iron particle size is about 70A, ε-Fe_2C iron carbide is formed, The phase iron forms the x-Fe_5C_2 iron carbide. The types of iron carbide generated during the carbonization of the Fe-K / AC and Fe-Mn / AC catalysts are still controlled by the particle size of iron. The additives K and Mn do not affect the formation of iron carbide However, Mn slows the carbonization of iron.