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

Abstract

Halogen‐doped Ni(F)/CeO2, Ni(Cl)/CeO2, and Ni(Br)/CeO2 catalysts were prepared by treating halogen‐free Ni/CeO2 with aqueous solutions of NH4F, NH4Cl, and NH4Br, respectively. It was demonstrated that the halogen dopants had distinct effects on the catalyst properties for the CO preferential methanation using realistic reformate gas: fluorine did not change catalytic activity, chlorine inhibited CO2 methanation activity and provided high selectivity towards CO methanation, and bromine completely inhibited both the CO and CO2 methanation activity.

Oxygen chemistry of halogen-doped CeO2(111)

“…26 A comparative study has also been performed of the effects of fluorine, chlorine and bromine doping on the performance of ceria based catalysts for the preferential methanation of carbon monoxide, which demonstrated significant differences between the three halogens. 28 Although motivated by them, the aim of the present study is not to address directly the complicated systems and reactions described above; instead, we will focus on elementary reactions that characterise more fundamentally the properties of halogen impurities at the (111) surface facet of ceria, and their effects on the surface oxygen chemistry. More specifically, our study is constructed around the comparison of fluorine, chlorine and bromine impurities in the context of the following seven elementary reactions.…”

Catalytic Performance and Characterization of Highly Efficient Composite Ni(Clx)/CeO2/η‐Al2O3/FeCrAl Wire Mesh Catalysts for Preferential CO Methanation

“…In our previous continuous research, nickel‐cerium oxide catalysts with chlorine content (denoted as Ni(Cl)/CeO 2 ) have been developed. They showed high efficiency in deep CO removal from reformate . The catalysts decreased the carbon monoxide concentration below 10 ppm level with high selectivity.…”

Effect of Fe‐Containing Supports Prepared by a Novel Sol–Gel Method in the CO Methanation Reaction: CO Elimination and Synthetic Natural Gas Production

“…However, the limited availability and high price restricted their industrial application. The use of transition metals such as nickel due to their lower price and higher availability is the practical option for the preparation of the CO methanation catalysts with high activity and stability . Thus, researchers want to find suitable catalyst support or promoter to improve the catalytic performance of nickel‐based catalysts in the CO methanation reaction.…”