METHOD OF BURNING HYDROCARBON FUELS (VERSIONS) AND CATALYSTS TO THIS END Russian patent published in 2009 - IPC F23C13/00 B01J23/40 

FIELD: chemistry.

SUBSTANCE: method of burning hydrocarbon fuel involves passing initial fuel through several catalyst zones using a catalyst packet containing two catalystes: Pd-containing catalyst for initiating the combustion process of the fuel-air mixture and a catalyst for stable combustion of the fuel-air mixture. Burning takes place in two catalyst zones, which are distinguished by layer porosity, composition of catalysts and their activity in hydrocarbon oxidation reactions: the catalyst used in the 1^st zone has layer porosity between 0.45 and 0.60 and contains PdO and/or Pd, deposited on granular aluminium oxide, modified with oxides of rare-earth elements, particularly cerium and/or lanthanum, with palladium content between 0.5 and 2.5 wt %; the catalyst used in the 2^nd zone is a granular oxide catalyst with layer porosity between 0.4 and 0.53, containing active component in form of 3 to 20 wt % manganese oxide or 20 to 90 wt % manganese hexaaluminate, or an oxide catalyst, modified with PdO and/or Pd in amount of 0.1 to 2.5 wt %. Initiation of the combustion process of the fuel-air mixture, which contains 1.0 to 6.0 vol % methane, takes place on the catalyst in the 1^st zone at temperature between 250 and 530°C; stable combustion of the fuel-air mixture takes place on the catalyst in the 2^nd zone at input temperature between 450 and 800°C, wherein temperature of waste gases at the outlet of the catalyst packet is between 750 and 950°C. The height ratio of the 1^st and 2^nd catalyst zones in the packet is between 0.1/0.9 and 0.2/0.8. To control the burning of the hydrocarbon fuel, a layer of inert material is placed between the 1^st and 2^nd zones, where this material can be granular aluminium oxide or corundum. Height of the layer of inert material is 0.025 to 0.15 of the height of the entire packet.

EFFECT: provision for environmental safety of waste gases and stable combustion of natural gas.

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