Cyclic catalytic upgrading of chemical species using metal oxide materials

A process for separating oxygen from air, comprising:

• cyclically adsorbing and desorbing oxygen on an oxygen-carrying catalyst comprising
• CexByB′zB″wOδ, wherein B=Ba, Sr, Ca, or Zr;
• B′=Mn, Co, or Fe;
• B′=Cu;
• and 0.01<x<0.99, 0<y<0.6, 0<w<0.5, and 1<δ<2.2), or
• SrvLawBxB′yB″zOδ (where B=Co or Fe, B′=Al or Ga, B′=Cu, 0.01<v<1.4, 0.1<w<1.6, 0.1<x<1.9, 0.1<y<0.9, 0<z<2.2, and 3<δ<5.5, or
• SrwLaxAly(B)zO2-α, wherein B=Co, Fe, Cu or a combination of any of those, 0.01<w<1, 0.01<x<1, 0.01<y<1, 0.01<z≦1, and 0<α<1.

A process for the cyclic catalytic partial oxidation of a carbon-containing feedstock, comprising:

• (a) in an oxidation stage, passing air over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from said air, to produce an oxidized catalyst and producing an effluent comprising oxygen-reduced air;
• (b) in a reduction stage, passing said feedstock over said oxidized catalyst to create a product gas comprising carbon monoxide and hydrogen, wherein said oxidized catalyst becomes reduced or partially reduced creating a metal or metal oxide;
• and
• (c) repeating (a) to reoxidize the catalyst, wherein said catalyst comprises at least one metal oxide selected from the group consisting of:
• CexByB′zB″Oδ, wherein B=Ba, Sr, Ca, or Zr;
• B′=Mn, Co, or Fe;
• B″=Cu;
• 0.01<x<0.99;
• 0<y<0.6;
• 0<z<0.5;
• 1<δ2.2;
• Ce1-x-yNixByO2-*, wherein B=Zr, Ba, Ca, La, or K;
• 0.02<x<0.1;
• 0.01<y<0.1;
• and 0.02<*<0.15, and
• SrvLawBxB′yB″zOδ, wherein B=Co or Fe;
• B′=Al or Ga;
• B″=Cu;
• 0.01<v<1.4;
• 0.1<w<1.6;
• 0.1<x<1.9;
• 0.1<y<0.9;
• 0<z<2.2;
• and 3<δ<5.5.

A process for the direct generation of hydrogen peroxide, comprising:

• (a) in an oxidation stage, passing air over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from said air, to produce an oxidized catalyst and producing an effluent comprising oxygen-depleted air;
• (b) passing hydrogen over said oxidized catalyst in a reduction stage to create a product gas comprising hydrogen peroxide, wherein said oxidized catalyst becomes reduced or partially reduced;
• and
• (c) repeating (a) to reoxidize the catalyst, wherein said catalyst comprises a nanostructured catalyst comprising a carbon- or nitrogen-containing metal complex deposited in the pores of a mesoporous support material, wherein said metal is selected from the group consisting of Pt, Pd, Au, Ag, Co, Ni, Cu or Ru.

A process for cyclic reduction of carbon dioxide, comprising

• (a) in an oxidation stage, passing carbon dioxide over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from said carbon dioxide, to produce an oxidized catalyst and producing an effluent comprising carbon monoxide;
• (b) in a reduction stage, passing hydrogen over said oxidized catalyst to produce water, whereby said oxidized catalyst becomes reduced or partially reduced;
• and
• (c) repeating (a) to reoxidize the catalyst, wherein said catalyst comprises iron.