The effect of CO on CO2 methanation over Ru/Al2O3 catalysts: a combined steady-state reactivity and transient DRIFT spectroscopy study

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

“…The vibrational modes at 1625 and 1440 cm −1 have been attributed to carbonates and bicarbonates, respectively. [ 32–35 ] Other vibrational modes cannot be assigned with complete confidence based on our literature review, but they are presumed to correspond with various carbonate and bicarbonate species. [ 32–35 ] Upon heating to 200 °C for desorption (Figure 2b), the bands at 2800, 1810, 1440, 1375, and 1200 cm −1 disappeared, signifying that the associated carbonate phases were weakly bound to the surface.…”

“…[ 32–35 ] Other vibrational modes cannot be assigned with complete confidence based on our literature review, but they are presumed to correspond with various carbonate and bicarbonate species. [ 32–35 ] Upon heating to 200 °C for desorption (Figure 2b), the bands at 2800, 1810, 1440, 1375, and 1200 cm −1 disappeared, signifying that the associated carbonate phases were weakly bound to the surface. However, a broad peak at 2125 cm −1 , which indicates CO bonds, and the sharp peaks at 1950 cm −1 and 1625 cm −1 , which signified CO and carbonate stretching, respectively, [ 32–35 ] remained present throughout the entire desorption step, indicating that they were strongly bound.…”

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

“…Qin et al 213 achieved high conversion and methane selectivity at 280 °C and over bimetallic catalysts containing Ni, and they suggested bicarbonate, carbonate, and formate as intermediates based on their in situ FTIR analyses. Falbo et al 214 investigated CO 2 methanation on Rh/Al 2 O 3 at low and high temperatures and observed higher catalyst stability when CO was added to the inlet. Their spectroscopic analyses were consistent with a path where CO 2 is adsorbed as bicarbonate on Al 2 O 3 and it is successively hydrogenated to CH 4 on Ru, passing through formate and carbonyl intermediates.…”

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

“…Since CH 4 is thermodynamically favoured over other CO 2 hydrogenation products such as CO, at low temperatures, CH 4 selectivity can be significantly higher when using noble metal catalysts [ 7 ]. Among the two noble metals, Ru can achieve higher activity and its price is considerably lower compared to Rh, while it can also provide significant methanation activity when supported on cheap supports (e.g., Al 2 O 3 or TiO 2 ) at a metal loading as low as 1% or even 0.5% [ 20 ]. Ru is also preferable to Ni for application in the combined capture and methanation of CO 2 derived from industrial flue-gases since the high reducibility of RuO x oxides allows for isothermal operation at low temperatures [ 21 , 22 ].…”