Highly Selective, Iron‐Driven CO₂ Methanation

Abstract

CO2 methanation has gained traction for its potential in renewable energy storage, though the high cost of renewable hydrogen production and costly metals used in methanation catalyst synthesis remain a significant barrier to implementation. Herein we present a Ru−Fe@NCNT catalyst, consisting of ruthenium and iron nanoparticles on nitrogen‐doped carbon nanotubes, as a highly selective, hydrogen efficient, iron‐driven alternative to typical nickel and ruthenium catalysts used for CO and CO2 methanation. Ru−Fe@NCNT offer competitive CO2 conversion and methane selectivity, and a reduction of up to 80 % in ruthenium loading versus similar literature and commercial catalysts. It is proposed that this desirable CO2 methanation performance, using an atypical optimal feed gas composition where PH2/PCO2=3, is the result of effective cooperation between the iron‐catalysed reverse water gas shift and methane‐selective Fischer‐Tropsch, and ruthenium‐catalysed CO methanation reactions.

N-Doped Fe@CNT for Combined RWGS/FT CO2 Hydrogenation

“…The Fe@CNT and Fe@NCNT catalysts were synthesized via a single-step CVD decomposition of FcH dissolved in toluene (for Fe@CNT) or ACN (for Fe@NCNT), as previously reported . Comparison of these materials using Raman, TEM, XPS, and XRD reveals clear nitrogen doping in the CNT support while maintaining a similar overall morphology.…”

In situ investigation of the CO2 methanation on carbon/ceria-supported Ni catalysts using modulation-excitation DRIFTS

“…Importantly, researchers continue to exploit different catalysts to achieve high CO 2 conversion and complete selectivity towards CH 4 . For example, a number of catalysts based on transition metals (Ni, Co, Fe) or platinumgroup metals (Ru, Rh) dispersed on porous supporting materials have been developed [2,[5][6][7][8][9][10][11][12]. Notably, Ni-based catalysts, compared to platinum-group metals, exhibit an optimal combination of activity, selectivity, and low price [2,5,6].…”

Silica-Decorated NiAl-Layered Double Oxide for Enhanced CO/CO2 Methanation Performance

“…In particular, methanation reactions have widely received a lot of attention [ 4 , 5 ] as the generated synthetic natural gas can effectively relieve pressure on natural gas supplies [ 6 , 7 ]. Methanation catalysts are often based on Group VIII metals (e.g., Ru [ 8 , 9 , 10 ], Rh [ 11 ], Co [ 12 , 13 ], Fe [ 14 , 15 ], Ni [ 16 , 17 ]) that are supported on various oxide supports. Among the active metals used in methanation reactions, precious metals such as Ru and Rh are the most reactive and selective, but their relatively high cost makes them at the disadvantage economically.…”