ISSN:
1432-072X
Keywords:
Syntrophic association
;
Interspecies H2 transfer
;
Butyrate oxidation
;
Acetogenesis
;
Methanogenesis
;
Gaseous olefin
;
Catalytic hydrogenation
;
Pd catalysts
;
Syntrophomonas wolfei
;
Methanospirillum hungatei
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Methanogenesis by a Syntrophomonas wolfei/ Methanospirillum hungatei coculture was inhibited in presence of ethylene and the hydrogenation catalyst Pd-BaSO4. However, butyrate oxidation by S. wolfei continued and ethylene was reduced to ethane. Per mol of butyrate oxidized, 2.4 mol acetate was produced and 0.8 mol ethylene was reduced. Acetylene, propylene and butene were less effective as H2 acceptors than ethylene, and addition of bromoethanesulfonic acid was necessary to inhibit methanogenesis in the presence of the two longer-chain olefins. Other hydrogenation catalysts were less effective in the order Pd-charcoal 〈 PE-asbestos 〈 Pd-PEI beads 〈 Pt-Al2O3, Pd-CaCO3. Optimal ethylene hydrogenation was achieved with still incubation in presence of 7.2 mg Pd-BaSO4 and 0.7 g sand per ml medium. The higher catabolic rate of S. wolfei in presence of the methanogen indicated that the biological H2 removal mechanism was more efficient than the catalytic olefin reduction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00406129
Permalink
