Carbon dioxide and carbon monoxide methanation by supported ruthenium catalysts

Abstract

Ruthenium carbonyl clusters, adsorbed on oxide supports and thermally decomposed under hydrogen, are very active catalysts for the methanation of both carbon monoxide and carbon dioxide.

Multimetallic Catalysis Based on Heterometallic Complexes and Clusters

“…At 623 K under CO/H 2 (1:2) pressure, [FeRu 3 ] catalysts derived from [H 2 FeRu 3 (CO) 13 ] supported on alumina, silica, or Na–Y zeolite afforded methane with yields in the range 40–43%, depending on the support. The main byproduct observed was CO 2 , as a result of the water gas shift reaction (H 2 O + CO → CO 2 + H 2 ) involving the water formed in situ (3H 2 + CO → CH 4 + H 2 O) …”

“…Methanation of CO was achieved with γ-alumina-, silica-, and Na–Y zeolite-supported catalysts derived from [PPN]­[Ru 3 Co­(CO) 13 ] and [HRuCo 3 (CO) 12 ] . The formation of CO 2 suggested the occurrence of the WGSR and the possibility, at low CO/H 2 ratio (1:4), to observe some CO 2 methanation.…”

Methanation of carbon monoxide and dioxide by supported metal carbonyl clusters

“…The former has long been known as a versatile, low pressure catalyst (3), while the latter has been shown to be very active as a C O methanation catalyst (10) and to show interesting Fischer-Tropsch properties ( 1 1-13). W e now report the results of our investigation~ to date; 'some of this work has been previously communicated (14).…”

Reduction of carbon monoxide and dioxide by metal carbonyls on a pyrolysed polymeric support

“…These catalysts also exhibit activity comparable to that of reported inorganic-oxide-supported systems for the methanation of C02. 3 The support we have been studying, pyrolysed polyacrylonitrile (PPAN), has been previously examined for a variety of uses.4 In addition to its thermal stability, paramagnetic nature, and semiconductor properties, we viewed the proposed fused pyridine structure (see Figure 1) as a feature making this material particularly attractive for a heavy metal support. This functionality could provide better support binding for metal clusters than the surface oxide or hydroxy groups of the typical inorganic oxide supports.…”