title: Catalysis of carbon monoxide methanation by deep sea manganate minerals.
abstract: The catalytic activity of deep sea manganese nodule minerals for the methanation of carbon monoxide was measured with a microcatalytic technique between 200 and 460 degrees C.  The manganate minerals were activated at 248 degrees C by immersion into a stream of hydrogen in which pulses of carbon monoxide were injected.  Activation energies for the methanation reaction and hydrogen desorption from the manganate minerals were obtained and compared with those of pure nickel.  Similar energy values indicate that the activity of the nodule materials for the reaction appears to be related to the amount of reducible transition metals present in the samples (ca. 11 wt.-%).  Since the activity of the nodule minerals per gram is comparable to that of pure nickel, most of the transition metal ions located between manganese oxide layers appear to be exposed and available to catalyze the reaction.
authors.affiliation: Department of Physics, University of California, San Diego, La Jolla 92093, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Cabrera
authors.forename: M B
authors.initials: MB
authors.lastname: Maple
authors.forename: G
authors.initials: G
authors.lastname: Arrhenius
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D005579:Fossil Fuels; D006859:Hydrogen / Q000737:chemistry; D017895:Manganese Compounds / Q000737:chemistry*; D008433:Mathematics; D008697:Methane / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D009791:Oceanography; D009792:Oceans and Seas; D013696:Temperature
chemical_list: D005579:Fossil Fuels; D017895:Manganese Compounds; D008903:Minerals; D009532:Nickel; D002248:Carbon Monoxide; D006859:Hydrogen; D008697:Methane