期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 248, 期 -, 页码 73-83出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.02.024
关键词
N-doped carbon materials; Fischer-Tropsch synthesis; Co catalysts; Pyrrolic N; Co-N interaction
资金
- National Natural Science Foundation of China [21676182, 21476159]
- 973 program [2014CB932403]
- Program for Introducing Talents of Discipline to Universities of China [B06006]
N-doped carbon supports are promising to improve reduction degree and dispersion of metal catalysts in Fischer-Tropsch synthesis (FTS). However, it is a great challenge to reasonably construct desired N dopants on FTS catalysts. Herein, we report the high FTS performance of the Co catalysts supported on N-doped carbon nanospheres synthesized by using a facile strategy. Through precisely tailoring the N dopants, we discover that the interaction between cobalt catalysts and supports is significantly strengthened via donation electron function of N atoms, especially for pyrrolic N. It improves the dispersion of cobalt species to generate more electron-enriched cobalt sites, which can strongly adsorb CO and accelerate CO dissociation to C*, resulting in the enhanced catalytic activity. In addition, these in turn increase C* concentration on the surface of the active cobalt sites, which is favorable to form a high concentration of chain initiators CH2 to stimulate carbon-chain growth, inducing the high selectivity towards the C5(+) products in FTS. Accordingly, the Co/NCS-500 catalyst with the high content of pyrrolic N presents the high FTS activity and C5(+) selectivity. Our work provides a new avenue in rational development of other related heterogeneous catalysis.
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