Metal grids with high-porous surface as structured catalysts: preparation, characterization and activity in propane total oxidation
Metal nickel and copper grids are shown to be suitable supports for structured combustion catalysts. The increase of sp. surface area (SSA) of metal grids was achieved due to the porous outer layer with the structure of Raney metal developed on the wire surface. Transition metals (Co, Cu, Mn, Cr) oxides were deposited as active components on the pre-oxidized support and tested in total propane oxidn. Cobalt oxide demonstrated the highest activity. Reductive pre-treatment in the flow of hydrogen resulted in a more active catalyst than the activation in oxygen atm. This effect was assigned to the partial redn. of Co3O4 until metallic Co, which was detected by XPS on the catalyst surface. Deactivation of the pre-reduced Co-oxide catalyst was obsd. during propane combustion in excess of oxygen and was ascribed to the oxidn. of partially reduced active phase. After 4 h on stream, the catalyst reached his steady-state and showed stable activity without further deactivation. The catalytic activity expressed in the terms of propane conversion was obsd. to depend on the propane/oxygen ratio. [on SciFinder (R)]
Air Pollution and Industrial Hygiene
Swiss Federal Institute of Technology, Institute of Chemical Engineering,Lausanne,Switz.
written in English.
1308-06-1 (Cobalt oxide co3o4); 1308-38-9 (Chromium oxide cr2o3); 1313-99-1 (Nickel oxide nio); 1317-35-7 (Manganese oxide mn3o4); 1317-38-0 (Cupric oxide); 7439-96-5 (Manganese); 7440-02-0 (Nickel); 7440-47-3 (Chromium); 7440-48-4 (Cobalt); 7440-50-8 (Copper) Role: CAT (Catalyst use), USES (Uses) (metal grids with high-porous surface as structured catalysts in propane oxidn.); 74-98-6 (Propane) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PROC (Process) (metal grids with high-porous surface as structured catalysts in propane oxidn.)
Record created on 2006-04-18, modified on 2016-08-08