Mechanistic study of the effect of chlorine on selective CO methanation over Ni alumina-based catalysts

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

“…alkali, earth alkali, sulfur, chlorine [7]) that may contaminate the catalysts used and modify the corresponding catalytic activity [8]. Miyao et al recently reported that chlorine, introduced ex situ during catalyst preparation, had a significant detrimental effect on the CO 2 methanation and the reverse water-gas shift activity of Ni-based catalysts, while still enabling CO methanation [9]. Kiskinova and Goodman [10] used surface science techniques to show that pre-adsorbed electronegative elements such as S and Cl strongly reduced the adsorption of CO and H 2 over Ni(1 0 0).…”

Selective CO Methanation on Highly Active Ru/TiO2 Catalysts: Identifying the Physical Origin of the Observed Activation/Deactivation and Loss in Selectivity

“…;68 , shifting the onset of CO 2 methanation to higher temperatures. This results in a wider temperature range with high selectivities for CO methanation.…”

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

“…The positive effect of chlorine additives on the catalyst selectivity was also demonstrated in Ref. . It was associated with the inhibition of the CO 2 methanation reaction by blocking the ceria surface sites responsible for CO 2 activation .…”

“…[9][10][11][12][13] Thep ositive effect of chlorinea dditives on the catalyst selectivity wasa lso demonstrated in Ref. [14][15][16].I tw as associated with the inhibition of the CO 2 methanation reactionb yb locking the ceria surface sites responsible for CO 2 activation. [12] However, the effects of other halogen additiveso nt he performanceo f nickel-ceria catalysts for the CO-SMET have not been studied yet.In this Communication we report the properties of F-, Cl-, and Br-doped8 wt %N i/CeO 2 catalysts prepared by the treatment of halogen-free Ni/CeO 2 with the aqueous solutions of NH 4 F, NH 4 Cl, and NH 4 Br, respectively, for the CO-SMET,a nd the properties are correlated with catalyst characterization data.…”