Preparation of a mesoporous ceria–zirconia supported Ni–Fe catalyst for the high temperature water–gas shift reaction

Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

“…Other than Cu, Fe has also been introduced as a secondary metal for Ni‐based catalysts. In contrast to the observations that enhanced strength of CO adsorption aids in suppression of methanation as in the case of alkali‐doped and bimetallic Ni−Cu alloy, formation of Ni−Fe alloy on hollow Ni−Fe−Al oxide nanocomposite catalysts and mesoporous ceria‐zirconia supported Ni−Fe catalyst was found to weaken the strength of CO adsorption on Ni metal and suppress hydrogen adsorption, thereby suppressing CO dissociation and subsequent hydrogenation to form methane, and allowing WGS reaction to proceed predominantly ,. In other work, DW Jeong et al .…”

Promotion of the Water‐Gas‐Shift Reaction by Nickel Hydroxyl Species in Partially Reduced Nickel‐Containing Phyllosilicate Catalysts

“…Watanabe et al. also found that Fe could weaken the adsorption of CO on Ni, thus preventing the CO dissociation and methanation reaction . In addition to alloy formation, Chen et al.…”

“…[5] Despite the high catalytic activity of Ni at high temperatures, it catalyzes the undesirable methanation side reaction, which decreasest he H 2 selectivity and hinders the commercialization of Ni-basedc atalysts. [6][7][8] To circumvent the methanation reaction, numerous methods have been studied, such as the incorporation of alkali metals, [9][10][11][12][13][14] formation of alloys with as econdary metal, [5,[15][16][17][18][19] addition of noble metals [18,19] and tuning the structural configuration. [20][21][22][23] Saw et al reported that Ni-Cu alloy could enhance the adsorption of CO on the metals, which can prevent CO dis-sociation.…”

“…also found that Fe could weaken the adsorption of CO on Ni, thus preventing the CO dissociation and methanation reaction. [17] In addition to alloy formation, Chen et al found that Pt as an oblem etal, could change the binding energy of CO with Ni surfacea nd retard methanation. [18] New designs of the catalyst structure have also improvedthe catalytic property of Ni catalysts.…”

Catalytic activity and durability of a mesoporous silica-coated Ni-alumina-based catalyst for selective CO methanation

“…They mentioned that Fe atoms were enriched on the alloy particles, enhanced the reforming reaction, and suppressed coke formation due to their ability to supply oxygen species. On the other hand, our group reported that coke deposition was significantly suppressed by Fe addition to Ni/Al 2 O 3 [16] and Ni/CeO 2 [17] catalysts during the water-gas shift reaction because of the suppression of CO adsorption. In the present study, we propose that the essential role of Fe for the suppression of the deactivation may be the decrease of CO surface coverage.…”