Direct Production of Iso-Paraffins from Syngas over Hierarchical Cobalt-ZSM-5 Nanocomposites Synthetized using Carbon Nanotubes as Sacrificial Templates

Khodakov, A; Marcilio, N; Ordomsky, V; Zholobenko, V; Baaziz, W; Flores, C; Batalha, N

doi:10.1002/cctc.201701848

Direct Production of Iso-Paraffins from Syngas over Hierarchical Cobalt-ZSM-5 Nanocomposites Synthetized using Carbon Nanotubes as Sacrificial Templates

Khodakov, A; Marcilio, N; Ordomsky, V; Zholobenko, V; Baaziz, W; Flores, C; Batalha, N

Authors

A Khodakov

N Marcilio

V Ordomsky

V Zholobenko

W Baaziz

C Flores

N Batalha

Abstract

his paper focuses on the effect of synthesis conditions on the structure of cobalt-ZSM-5 zeolites and the localization, dispersion, and reducibility of cobalt species and their catalytic performance in Fischer–Tropsch synthesis. The zeolite catalysts were prepared by using carbon nanotubes as sacrificial templates. Addition of pristine carbon nanotubes resulted only in a slight increase in the zeolite mesoporosity, whereas the presence of carbon nanotubes impregnated with cobalt drastically modified the zeolite morphology and texture. The zeolite mesoporous volume increased by 3–4 times. The catalysts prepared by using cobalt-impregnated carbon nanotubes as templates showed 5–8 times higher Fischer–Tropsch reaction rates normalized by reducible cobalt compared with the catalysts prepared by conventional impregnation. Higher selectivity to isomerized branched hydrocarbons on these zeolites was attributed to the enhanced diffusion favoring removal of isomerized products and avoiding their cracking.

Acceptance Date	Jan 31, 2018
Publication Date	Feb 3, 2018
Journal	ChemCatChem
Print ISSN	1867-3880
Publisher	Wiley
Pages	2291-2299
DOI	https://doi.org/10.1002/cctc.201701848
Keywords	carbon nanotubes, cobalt, Fischer–Tropsch synthesis, hierarchical zeolites, sacrificial templates, ZSM-5
Publisher URL	https://doi.org/10.1002/cctc.201701848