What drives the selectivity for CO methanation in the methanation of CO2-rich reformate gases on supported Ru catalysts?

Improved Performance of Ru/γ‐Al2O3 Catalysts in the Selective Methanation of CO in CO2‐Rich Reformate Gases upon Transient Exposure to Water‐Containing Reaction Gas

“…[17,19] The correlation between Ru particles ize and activity for CO 2 dissociation can thus be used as further evidencef or our proposal of aw ater-induced increase in Ru particle dispersion as the origin for the observed increasei ns electivity/decrease in particle size upon treatment in wet reformate.…”

“…Previous measurements on an identical catalyst showeds imilar reactionr ates and selectivities. [17] The significantly higherC Or eaction rates in SR-ref 100 relative to those observedi nS R-ref6 000 reflects the negative reaction order of CO in CO methanation over supported Ru catalysts under these reactionconditions. [16] The impact of activating the catalysti nw et reformate was tested in as imilarw ay as that describeda bove, by first exposing the catalystt oS R-ref 100 containing different amountso f water (activation and reaction until reaching steady-statec onditions), and afterwardss witching to dry SR-ref 100.…”

“…These studies led to as trict correlation between the selectivity for CO at low CO concentrations and the average diameter of Ru nanoparticles (NPs): with decreasing Ru particle size, the selectivity for CO methanationw as found to increase. [16][17][18][19] This was shown to originate from an inherently lower activity for CO 2 dissociation over smaller Ru NPs, whichr esulted in al ower CO 2 methanation activity. Furthermore, severalg roups,i ncluding ours, have recently investigated the impact of technically relevanta mountso f water in the reaction gas mixture( up to 30 %) on the catalytic activity and selectivity of Ru catalysts fors elective CO methanation in the presence of up to 15.5 %C O 2 .…”

Role of trace chlorine in Ni/TiO2 catalyst for CO selective methanation in reformate gas

“…Therefore, a novel catalyst for CO-SMET needs to be developed, which demonstrates high activity for CO methanation and high reaction selectivity to CO methanation derived from low activity for CO 2 methanation and r-WGS. CO [10][11][12][13][14][15][16], Ru/zeolite [17][18][19][20], Ru/NiAl x O y [21,22], Ru/Mesoporous-Ni-Al-O x [23], Ru/TiO 2 [24][25][26],…”

Bio-syngas methanation towards synthetic natural gas (SNG) over highly active Al 2 O 3 –CeO 2 supported Ni catalyst

“…Compared to other metals such as Ru, Rh, Co and Fe [8][9][10][11], the use of Ni-based catalysts is more attractive for methanation of CO to SNG due to their higher activity and selectivity to methane and lower cost [12][13][14]. Abundant efforts have been made to modify methanation performances for Ni-based catalysts by adjusting promoters and supports [13][14][15].…”