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Citation: Xiaoqi Chen, Dehui Deng, Xiulian Pan, Xinhe Bao. Iron catalyst encapsulated in carbon nanotubes for CO hydrogenation to light olefins[J]. Chinese Journal of Catalysis, ;2015, 36(9): 1631-1637. doi: 10.1016/S1872-2067(15)60882-8 shu

Iron catalyst encapsulated in carbon nanotubes for CO hydrogenation to light olefins

1.
State Key Laboratory of Catalysis, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

Corresponding author: Dehui Deng, Xinhe Bao,
Received Date: 30 March 2015
Available Online: 5 May 2015
Fund Project: 国家自然科学基金(21321002, 21303191) (21321002, 21303191) 中国科学院战略性先导科技专项(A类)资助(XDA09030100). (A类)资助(XDA09030100)

Fe-based catalyst is an outstanding candidate for the Fischer-Tropsch reaction to get light olefins from syngas directly. However, exposed Fe species are susceptible to sintering and coking, which lead to deactivation. Here, we demonstrate that Fe nanoparticles encapsulated in pod-like carbon nanotubes (Pod-Fe) can be used as an efficient Fischer-Tropsch catalyst to produce light olefins. It gave a higher selectivity of light olefins (45%) and high stability over 120 h reaction (P=0.5 MPa, T=320℃, CO:H₂= 1:2, gas hourly space velocity=3500 h^-1). A catalyst with exposed Fe particles on the outside of the Pod-Fe (FeO_x/Pod-Fe) catalyst showed a selectivity of light olefins of 42%, but had a significantly lower stability due to the agglomeration of Fe nanoparticles and carbon deposition. These results indicated that the graphene shell of Pod-Fe played an important role in protecting the Fe particles and provided a rational way to enhance the activity and stability of Fe-based catalysts in high temperature reactions.
- Fischer-Tropsch synthesis,
- Stability,
- Light olefins,
- Carbon nanotubes,
- Iron nanoparticles
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