Aging study of low Ru loading dual function materials (DFM) for combined power plant effluent CO2 capture and methanation

Cyclic performance in CO2 capture-methanation of bifunctional Ru with different base metals: Effect of the reactivity of COx ad-species

“…Other authors also reported degradation with the cycle number at 300ºC for physical mixtures of Na sorbent and Ru catalyst [10]. In contrast to our work, aging studies performed with 5%Ru, 6.1%Na 2 O/γ-Al 2 O 3 tablets by other authors [29] showed stable cyclic performance at 300 ºC or slow very deactivation at 320 ºC under industrially relevant conditions [34]. This suggest that the performance is very sensitive to the metal loadings and preparation method and we have to perform further optimisation of the formulation of our catalyst.…”

Bimetallic RuNi-decorated Mg-CUK-1 for oxygen-tolerant carbon dioxide capture and conversion to methane

“…56 However, using low loadings of Ru (0.5%Ru) in the absence of Ni has led to diminished performance upon cycling, attributed to deactivation and potentially sintering upon exposure to O 2 and steam in flue gas. 20…”

“…To date, hybrid sorbent/catalyst materials have focused on using metal oxides, metal carbonates and metal bicarbonates as CO 2 capture agents. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Once the sorbent reaches saturation through the formation of carbonate or bicarbonate species; the reactor system is heated to an appropriate reaction temperature (300-400 °C), where H 2 is introduced to generate CH 4 . However, due to the strong carbonate/bicarbonate chemical bonds created during carbon uptake, high temperatures are necessary to completely desorb the bound CO 2 so it is available for hydrogenation.…”

“…4,26 Even at high temperatures, incomplete CO 2 desorption has been observed in metal oxide-based hybrid sorbent/catalyst systems. [13][14][15][18][19][20][27][28][29] To overcome these challenges, using physisorption-based carbon capture agents in hybrid sorbent/catalysts is advantageous due to complete CO 2 desorption below typical CO 2 hydrogenation reaction temperatures. Metal-organic frameworks represent a class of materials demonstrating large physisorption-led CO 2 uptakes.…”

“…4,26 Even at high temperatures, incomplete CO 2 desorption has been observed in metal oxide-based hybrid sorbent/catalyst systems. 13–15,18–20,27–29…”