Iron deposits and

Four pilot plant experiments were conducted at 300 psig and up to 475°C maximum temperature in a 3.07-in. i.d. adiabatic hot gas recycle methanation reactor. Two catalysts were used parallel plates coated with Raney nickel and precipitated nickel pellets. Pressure drop across the parallel plates was about 1/15 that across the bed of pellets. Fresh feed gas containing 75% H2 and 24% CO was fed at up to 3000/hr space velocity. CO concentrations in the product gas ranged from less than 0.1% to 4%. Best performance was achieved with the Raney-nickel-coated plates which yielded 32 mscf CHh/lb Raney nickel during 2307 hrs of operation. Carbon and iron deposition and nickel carbide formation were suspected causes of catalyst deactivation. 

Morris, C.J., Blake, D.R., Wainwright, A.C. and Steven, M.M. (1986). Relationship between iron deposits and tissue damage in the synovium an ultrastructural study. Ann. Rheum. Dis. 45, 21-26. 

Exon, N.F. Cronan, D.S. (1983) Hydrothermal iron deposits and assodated sediments from submarine volcanoes off Vanuatu, Southwest Pacific. Marine Geol. 52 M43-M52... 

Iron deposits and microorganisms in saline sulfidic soils with altered soil water regimes in South Australia. In Skinner, H.G.W. Fitzpatrick, R.W. (eds.) Biomineralization processes of iron and manganese. Catena Ver-lag, Cremlmgen-Destedt, Catena Suppl. 21 ... 

Sarthou G, Baker AR, Blain S, Achterberg EP, Boye M, Bowie AR, Croot P, Laan P, de Baar HJW, Jickells TD, Worsfold PJ (2003) Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean. Deep-Sea Res 50 1339-1352 Schafer H, Muyzer G (2001) Denaturing gradient gel electrophoresis in marine microbial ecology. In Paul J (ed) Methods in microbiology, vol 30. Academic Press, London, pp 425-468... 

Excess—hemochromatosis (abnormal iron deposits and damage to liver, pancreas and other tissues). 

The second step (or a cascade of similar cells) is applied to shift the pH of the solution to higher values. Hydrogen is needed only due to minor iron deposition and losts. 

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