Issue 8, 2016

Carbon/H-ZSM-5 composites as supports for bi-functional Fischer–Tropsch synthesis catalysts

Abstract

Mesoporous H-ZSM-5–carbon composites, prepared via tetrapropylammonium hydroxide (TPAOH) post treatment of H-ZSM-5 followed by deposition of pyrolytic carbon, have been used as the support for the preparation of Co-based Fischer–Tropsch catalysts. The resulting catalysts display an improved performance during Fischer–Tropsch synthesis (FTS), with higher activity, higher selectivity towards C5–C9 (gasoline range) hydrocarbons and lower selectivity towards C1 (and C2) than Co/mesoH-ZSM5 (without pyrolytic carbon). This is due to the weaker metal–support interaction caused by the deposited carbon (as revealed by XPS) leading to a higher reducibility of the Co species. Further, the partial deactivation of the Brønsted acid sites by pyrolytic carbon deposition, as was observed by NH3-TPD, allows the modification of the zeolite acidity. Both the olefin to paraffin (O/P) and the isoparaffin to normal paraffin (I/N) ratios decrease with the increase in the carbon content, opening the door to further tune the catalytic performance in multifunctional FTS operations.

Graphical abstract: Carbon/H-ZSM-5 composites as supports for bi-functional Fischer–Tropsch synthesis catalysts

Supplementary files

Article information

Article type
Paper
Submitted
12 nov. 2015
Accepted
07 ene. 2016
First published
07 ene. 2016
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2016,6, 2633-2646

Carbon/H-ZSM-5 composites as supports for bi-functional Fischer–Tropsch synthesis catalysts

M. J. Valero-Romero, S. Sartipi, X. Sun, J. Rodríguez-Mirasol, T. Cordero, F. Kapteijn and J. Gascon, Catal. Sci. Technol., 2016, 6, 2633 DOI: 10.1039/C5CY01942G

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