Combustion looping using composite oxygen carriers

A method for producing a hydrogen gas stream and a separate sequestrable CO2 stream from a carbonaceous fuel and steam comprising the steps of:

• reducing a Fe2O3 containing particle by reacting said particle with a carbonaceous fuel in a first reaction zone comprising a moving packed bed reactor, a countercurrent rotary kiln, a series of interconnected fluidized bed reactors, or a series of interlinked monolithic bed structures by flowing said particle countercurrently to the flow of a gaseous phase generated by said carbonaceous fuel to form a metallic iron containing particle, the reducing reaction also directly producing a sequestrable stream of CO2 and H2O rich gas comprising at least 90 mol % of CO2 and steam combined;
• oxidizing the metallic iron containing particle with steam in a second reaction zone comprising a moving packed bed reactor, a countercurrent rotary kiln, a series of interconnected fluidized bed reactors, or a series of interlinked monolithic bed structures by flowing said metallic iron containing particle countercurrently to said steam in said second reaction zone producing an iron oxide containing particle, wherein the iron has a higher oxidation state, the oxidation reaction also producing a H2 rich gas stream;
• oxidizing the iron oxide containing particle obtained from the oxidation reaction in said second reaction zone with an oxygen containing gas in a third reaction zone to produce a Fe2O3 containing particle;
• and
• returning the Fe2O3 containing particle to said first reaction zone.