The remarkable effect of the preparation procedure on the catalytic activity of CoBEA zeolites in the Fischer-Tropsch SynthesisReport as inadecuate




The remarkable effect of the preparation procedure on the catalytic activity of CoBEA zeolites in the Fischer-Tropsch Synthesis - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 Institute of General and Ecological Chemistry 2 LRS - Laboratoire de Réactivité de Surface

Abstract : This work deals with the investigation of the influence of the preparation procedure and Co content on the activity of CoBEA zeolite in Fischer – Tropsch synthesis. For this purpose the Co-containing zeolites were prepared by a conventional wet impregnation CoxAlBEA series and a two-step postsynthesis method CoxSiBEA series. Calcination at 500 °C, for 3h in air and then reduction at 500 °C in flow of 95 % H2 – 5 % Ar stream of as prepared CoxAlBEA and CoxSiBEA zeolites led to obtain Red-C-CoxAlBEA and Red-C-CoxSiBEA catalysts with different properties in Fischer – Tropsch reaction. The most active catalysts were Red-C-Co10SiBEA and Red-C-Co20SiBEA with high CO conversion of 90 – 95 % and selectivity towards liquid products of 85 % containing C7 – C18 n-alkanes, isoalkanes and small amount of olefins. In the case of Red-C-CoxAlBEA catalysts the CO conversion was of 68 % and selectivity towards liquid products of 57 %. The identified liquid products were mainly C7 – C16 n-alkanes. Moreover, Red-C-CoxSiBEA catalysts demonstrated better stability and resistance to coke formation than Red-C-CoxAlBEA ones. It is probably related to higher dispersion of cobalt nanoparticles in Red-C-CoxSiBEA than in Red-C-CoxAlBEA catalysts and absence of strong Brønsted acidic sites in the former after removal of aluminium in the first step of two-step postsynthesis preparation procedure.

Keywords : H2 BEA Co Fischer – Tropsch Synthesis





Author: Karolina A. Chalupka - Sandra Casale - Ewa Zurawicz - Jacek Rynkowski - Stanislaw Dzwigaj -

Source: https://hal.archives-ouvertes.fr/



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