Cubic FeN particles of a few nanometers in size were synthesized for the first time by encapsulation inside carbon nanotube (CNT) channels. Such an FeN catalyst exhibits a 5–7 times higher activity than a reduced Fe catalyst and a SiO2 supported iron nitride in CO hydrogenation. The confined FeN catalyst is also more active than iron nitride particles dispersed on the CNT exterior walls.
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Yang et al. (2011) studied this question.
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