The Impact of Reduction Temperature and Nanoparticles Size on the Catalytic Activity of Cobalt-Containing BEA Zeolite in Fischer–Tropsch Synthesis - Archive ouverte HAL
Article Dans Une Revue Catalysts Année : 2020

The Impact of Reduction Temperature and Nanoparticles Size on the Catalytic Activity of Cobalt-Containing BEA Zeolite in Fischer–Tropsch Synthesis

Résumé

A goal of this work was to investigate the influence of the preparation procedure and activation conditions (reduction temperature and reducing medium: pure hydrogen (100% H 2) or hydrogen-argon mixture (5% H 2-95% Ar)) on the activity of Co-containing BEA zeolites in Fischer-Tropsch synthesis. Therefore, a series of CoBEA zeolites were obtained by a conventional wet impregnation (Co 5.0 AlBEA) and a two-step postsynthesis preparation procedure involving dealumination and impregnation steps (Co 5.0 SiBEA). Both types of zeolites were calcined in air at 500 • C for 3 h and then reduced at 500, 800 and 900 • C for 1 h in 100 % H 2 and in 5% H 2-95% Ar mixture flow. The obtained Red-C-Co 5.0 AlBEA and Red-C-Co 5.0 SiBEA catalysts with various physicochemical properties were tested in Fischer-Tropsch reaction. Among the studied catalysts, Red-C-Co 5.0 SiBEA reduced at 500 • C in pure hydrogen was the most active, presenting selectivity to liquid products of 91% containing mainly C 7-C 16 n-alkanes and isoalkanes as well as small amount of olefins, with CO conversion of about 11%. The Red-C-Co 5.0 AlBEA catalysts were not active in the Fischer-Tropsch synthesis. It showed that removal of aluminum from the BEA zeolite in the first step of postsynthesis preparation procedure played a key role in the preparation of efficient catalysts for Fischer-Tropsch synthesis. An increase of the reduction temperature from 500 to 800 and 900 • C resulted in two times lower CO conversion and a drop of the selectivity towards liquid products (up to 62%-88%). The identified main liquid products were n-alkanes and isoalkanes. The higher activity of Red-C-Co 5.0 SiBEA catalysts can be assigned to good dispersion of cobalt nanoparticles and thus a smaller cobalt nanoparticles size than in the case of Red-C-Co 5.0 AlBEA catalyst.
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hal-03987087 , version 1 (13-02-2023)

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Karolina A Chalupka, Jacek Grams, Pawel Mierczynski, Malgorzata I Szynkowska, Jacek Rynkowski, et al.. The Impact of Reduction Temperature and Nanoparticles Size on the Catalytic Activity of Cobalt-Containing BEA Zeolite in Fischer–Tropsch Synthesis. Catalysts, 2020, 10 (5), pp.553. ⟨10.3390/catal10050553⟩. ⟨hal-03987087⟩
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