Heats of adsorption of linearly adsorbed CO species on Co2+ and Co° sites of reduced Co/Al2O3 catalysts in relationship with the CO/H2 reaction

Origins of the poisoning effect of chlorine on the CO hydrogenation activity of alumina-supported cobalt monitored by operando FT-IR spectroscopy

“…In contrast, a band shift only related to a decrease of surface coverage should lead to a shift of the band toward lower wave numbers (Figs. 4 and 5) [29][30][31]. This apparent discrepancy can be simply rationalized by introducing a strong electronic effect related to chlorine, which opposed the effects of surface coverage of CO on the position of the IR band of the C-O stretching vibration.…”

“…and 2002 cm À1 (noted ''L 2 '') at steady-state before TCE introduction (Fig. 6), that are assigned to linear carbonyls [20,29,30,[34][35][36]. The large shift observed with the initial decaying signal (Fig.…”

“…The CO(ads) observed at steady-state before TCE introduction presented a main band located at 2038 cm À1 (Fig. 3, blue 2 spectrum), which can be assigned to CO linearly (on-top) adsorbed on metallic cobalt [3,18,29,30]. The asymmetric nature of the band indicated that several sites or adsorption modes were present.…”

Measurement of the Influence of the Microstructure of Alumina‐Supported Cobalt Catalysts on their Activity and Selectivity in Fischer–Tropsch Synthesis by using Steady‐State and Transient Kinetics

“…[23] CO chemisorption was performed at RT by using the dynamic sorption technique described by Couble and Bianchi. [34] Ex situ characterization techniques Before activation, the catalysts were characterized by using aw ide range of ex situ techniques. The BET surfaces areas were measured by using N 2 physisorption at 77 Kb yu sing an ASAP 2420.…”

Determination of formate decomposition rates and relation to product formation during CO hydrogenation over supported cobalt

“…The band at 2032 cm −1 is typical of CO linearly adsorbed on a metallic surface of cobalt [1,23,24]. The bands at 1592 cm −1 (asymmetric OCO stretching), 1392 cm −1 (C-H bending) and 1378 cm −1 (symmetric OCO stretching) can be assigned to formate species on the alumina surface [25,26].…”