A system for converting fuel comprising: an oxygen carrying material comprising: about 20% to about 70% by weight of a primary active mass, the primary active mass comprising a composition having a metal or metal oxide selected from the group consisting of Fe, Co, Ni, Cu, Mo, Mn, Sn, Ru, Rh, and combinations thereof; about 5% to about 70% by weight of a primary support material, the primary support material comprising a composition having: (i) at least one metal, metal oxide, metal carbide, metal nitrate, metal halide, or combinations thereof; (ii) at least one ceramic or clay material, or salts thereof; (iii) at least one naturally occurring ore; or (iv) combinations thereof; and about 1% to about 35% by mass of a secondary support material, wherein the secondary support material comprises an oxide of Mg, wherein the primary support material composition and the secondary support material composition are different; a first reactor comprising a moving bed and an inlet for providing fuel to the first reactor, wherein the first reactor is configured to reduce the oxygen carrying material with the fuel to produce a reduced oxygen carrying material; and a second reactor communicating with the first reactor and an oxygen source, wherein the second reactor is configured to regenerate the oxygen carrying material by oxidizing the oxygen carrying material. an oxygen carrying material comprising: about 20% to about 70% by weight of a primary active mass, the primary active mass comprising a composition having a metal or metal oxide selected from the group consisting of Fe, Co, Ni, Cu, Mo, Mn, Sn, Ru, Rh, and combinations thereof; about 5% to about 70% by weight of a primary support material, the primary support material comprising a composition having: (i) at least one metal, metal oxide, metal carbide, metal nitrate, metal halide, or combinations thereof; (ii) at least one ceramic or clay material, or salts thereof; (iii) at least one naturally occurring ore; or (iv) combinations thereof; and about 1% to about 35% by mass of a secondary support material, wherein the secondary support material comprises an oxide of Mg, wherein the primary support material composition and the secondary support material composition are different; about 20% to about 70% by weight of a primary active mass, the primary active mass comprising a composition having a metal or metal oxide selected from the group consisting of Fe, Co, Ni, Cu, Mo, Mn, Sn, Ru, Rh, and combinations thereof; about 5% to about 70% by weight of a primary support material, the primary support material comprising a composition having: (i) at least one metal, metal oxide, metal carbide, metal nitrate, metal halide, or combinations thereof; (ii) at least one ceramic or clay material, or salts thereof; (iii) at least one naturally occurring ore; or (iv) combinations thereof; and (i) at least one metal, metal oxide, metal carbide, metal nitrate, metal halide, or combinations thereof; (ii) at least one ceramic or clay material, or salts thereof; (iii) at least one naturally occurring ore; or (iv) combinations thereof; and about 1% to about 35% by mass of a secondary support material, wherein the secondary support material comprises an oxide of Mg, wherein the primary support material composition and the secondary support material composition are different; a first reactor comprising a moving bed and an inlet for providing fuel to the first reactor, wherein the first reactor is configured to reduce the oxygen carrying material with the fuel to produce a reduced oxygen carrying material; and a second reactor communicating with the first reactor and an oxygen source, wherein the second reactor is configured to regenerate the oxygen carrying material by oxidizing the oxygen carrying material. <EOS>