Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis

Impact Factor:

7.92

DOI number:

10.1016/j.jcat.2018.11.002

Journal:

J. Catal.

Key Words:

Fischer-Tropsch synthesis, Synthesis gas, Product distribution, Cobalt, Size effect, Porous carbon

Abstract:

The size effect of the metallic Co (Co0) over supported catalysts for Fischer-Tropsch synthesis (FTS) has imposed great importance for developing a high-performance catalyst. However, the lack of well-structured catalysts makes the clarification of the intrinsic size-dependence of Co0 still a challenge. In this work, the Co/C catalysts with Co0 particles from 8.4 ± 1.9 to 74.8 ± 11.6 nm were synthesized by well-controlled pyrolysis of ZIF-67. Based on different characterizations, Co/C catalysts via pyrolyzing ZIF-67 above 450 °C were confirmed as Co0 entrapped in partially graphitized carbon matrix polished by a certain amount of pyridinic and graphitic N and a small portion of adsorbed oxygen. Without the limitation of high-temperature reduction and the dispersion-reducibility dependence, the intrinsic size effect of Co0 on the activity and product selectivity of FTS was rigorously revealed, and the critical size was determined to be 10.5 ± 1.9 nm.

Co-author:

Li-Peng Guo, Si-Yu Yao, Jun Bao, Zhao-Tie, Zhong-wen Liu

First Author:

Qun-XingLuo

Correspondence Author:

Zhong-WenLiu

Volume:

369

Page Number:

143-156

ISSN No.:

0021-9517

Translation or Not:

no

Date of Publication:

2018-11-16

Links to published journals:

https://www.sciencedirect.com/science/article/pii/S0021951718304329