Tuning the Metal Support Interaction and Enhancing the Stability of Titania Supported Cobalt Fischer-Tropsch Catalysts via Carbon Nitride Coating

Hong, Jingping; Wang, Bo; Xiao, Guiqin; Wang, Ning; Zhang, Yuhua; Khodakov, Andrei Y; Li, Jinlin

Tuning the Metal Support Interaction and Enhancing the Stability of Titania Supported Cobalt Fischer-Tropsch Catalysts via Carbon Nitride Coating

Files

T_Turning the metal support.pdf (4.46 MB)

Embargo End Date

2021-04-15

Type

Article

Authors

Hong, Jingping
Wang, Bo
Xiao, Guiqin
Wang, Ning
Zhang, Yuhua
Khodakov, Andrei Y
Li, Jinlin

KAUST Department

Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division, King Abdullah University of Science and Technology Thuwal 23955, Saudi Arabia.

Online Publication Date

2020-04-15

Print Publication Date

2020-05-15

Date

2020-04-15

Abstract

Supported metal catalysts have found numerous applications in many catalytic reactions, including Fischer-Tropsch synthesis. Metal dispersion, metal reducibility, catalytic performance and catalyst stability are usually strongly affected by the interaction of active phase and support. A strong metal support interaction has been previously reported for titania supported catalysts. In this work, a series of titania supported cobalt catalysts promoted via deposition of a layer of carbon nitride were prepared, characterized and tested in Fischer-Tropsch synthesis. The catalytic performance of freshly activated catalysts was an interplay of cobalt dispersion and reducibility. Deposition of carbon nitride on the surface of titania resulted in a noticeable enhancement of cobalt dispersion, while it hindered to some extent cobalt reducibility. The non-promoted cobalt catalysts exhibited noticeable deactivation in Fischer-Tropsch synthesis. The catalyst deactivation was due to the progressive encapsulation of cobalt active phase by TiO2 during the reaction. A carbon nitride layer on the TiO2 surface stabilized cobalt nanoparticles and prevented encapsulation of active sites by TiO2 species. The stability was significantly enhanced on all titania supported cobalt catalysts promoted with carbon nitride.

Citation

Hong, J., Wang, B., Xiao, G., Wang, N., Zhang, Y., Khodakov, A. Y., & Li, J. (2020). Tuning the Metal Support Interaction and Enhancing the Stability of Titania Supported Cobalt Fischer-Tropsch Catalysts via Carbon Nitride Coating. ACS Catalysis. doi:10.1021/acscatal.0c01121

Acknowledgements

We thank the financial support by National Natural Science foundation of China (21203255, 21473259), Hubei Natural Science Foundation (2018CFB556), Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Personnel of China (BZY14037), Fundamental Research Funds for the Central Universities (South-Central University for Nationalities, CZY19006). AK thanks the South Central University for Nationalities for funding his research stay in Wuhan.