The present invention relates to: oxygen carrier particles having a metal oxide-perovskite core-shell structure; and a chemical-looping thermochemical water/carbon dioxide splitting process using the same. By using the oxygen carrier particles having a metal oxide-perovskite core-shell structure in the chemical-looping thermochemical water/carbon dioxide splitting process, it is possible to produce hydrogen/carbon monoxide from water/carbon dioxide in high yield by efficiently overcoming the disadvantages of conventionally used oxygen carrier particles.

The present invention relates to: oxygen carrier particles having a metal oxide-perovskite core-shell structure; and a chemical-looping thermochemical water/carbon dioxide splitting process using the same. By using the oxygen carrier particles having a metal oxide-perovskite core-shell structure in the chemical-looping thermochemical water/carbon dioxide splitting process, it is possible to produce hydrogen/carbon monoxide from water/carbon dioxide in high yield by efficiently overcoming the disadvantages of conventionally used oxygen carrier particles.

The present disclosure relates to a method for preparing a ceria-zirconia composite oxide, a ceria-zirconia composite oxide, and a catalyst including the same.

The present disclosure relates to a method for preparing a ceria-zirconia composite oxide, a ceria-zirconia composite oxide, and a catalyst including the same.

Disclosed are a composite oxide which is capable of maintaining a large volume of pores even used in a high temperature environment, and which has excellent heat resistance and catalytic activity, as well as a method for producing the composite oxide and a catalyst for exhaust gas purification employing the composite oxide. The composite oxide contains cerium and at least one element selected from aluminum, silicon, or rare earth metals other than cerium and including yttrium, at a mass ratio of 85:15 to 99:1 in terms oxides, and has a property of exhibiting a not less than 0.30 cm.sup.3/g, preferably not less than 0.40 cm.sup.3/g volume of pores with a diameter of not larger than 200 nm, after calcination at 900° C. for 5 hours, and is suitable for a co-catalyst in a catalyst for vehicle exhaust gas purification.

Disclosed are a composite oxide which is capable of maintaining a large volume of pores even used in a high temperature environment, and which has excellent heat resistance and catalytic activity, as well as a method for producing the composite oxide and a catalyst for exhaust gas purification employing the composite oxide. The composite oxide contains cerium and at least one element selected from aluminum, silicon, or rare earth metals other than cerium and including yttrium, at a mass ratio of 85:15 to 99:1 in terms oxides, and has a property of exhibiting a not less than 0.30 cm.sup.3/g, preferably not less than 0.40 cm.sup.3/g volume of pores with a diameter of not larger than 200 nm, after calcination at 900° C. for 5 hours, and is suitable for a co-catalyst in a catalyst for vehicle exhaust gas purification.

Catalysts for oxidative esterification can be used, for example, fro converting (meth)acrolein to methyl (meth)acrylate. The catalysts are especially notable for high mechanical and chemical stability even over very long time periods, including activity and/or selectivity relatively in continuous operation in media having even a small water content.

Catalysts for oxidative esterification can be used, for example, fro converting (meth)acrolein to methyl (meth)acrylate. The catalysts are especially notable for high mechanical and chemical stability even over very long time periods, including activity and/or selectivity relatively in continuous operation in media having even a small water content.

The present invention relates to a process for the dehydration of at least one oxygenated compound, preferably selected from saturated alcohols, unsaturated alcohols, diols, ethers, in the presence of at least one dehydration catalyst selected from cerium oxide (CeO.sub.2), aluminium oxide (γ-Al.sub.2O.sub.3), aluminium silicate, silica-aluminas (SiO.sub.2-Al.sub.2O.sub.3), aluminas, zeolites, sulfonated resins, ion-exchange resins, metal oxides (for example, lanthanum oxide, zirconium oxide, tungsten oxide, thallium oxide, magnesium oxide, zinc oxide); of at least one basic agent selected from ammonia (NH.sub.3), or from inorganic or organic compounds containing nitrogen capable of developing ammonia (NH.sub.3) during said dehydration process; and, optionally, of silica (SiO.sub.2), or of at least one catalyst for the dissociation of ammonia (NH.sub.3) selected from catalysts comprising silica (SiO.sub.2), preferably of silica (SiO.sub.2).

The present invention relates to a process for the dehydration of at least one oxygenated compound, preferably selected from saturated alcohols, unsaturated alcohols, diols, ethers, in the presence of at least one dehydration catalyst selected from cerium oxide (CeO.sub.2), aluminium oxide (γ-Al.sub.2O.sub.3), aluminium silicate, silica-aluminas (SiO.sub.2-Al.sub.2O.sub.3), aluminas, zeolites, sulfonated resins, ion-exchange resins, metal oxides (for example, lanthanum oxide, zirconium oxide, tungsten oxide, thallium oxide, magnesium oxide, zinc oxide); of at least one basic agent selected from ammonia (NH.sub.3), or from inorganic or organic compounds containing nitrogen capable of developing ammonia (NH.sub.3) during said dehydration process; and, optionally, of silica (SiO.sub.2), or of at least one catalyst for the dissociation of ammonia (NH.sub.3) selected from catalysts comprising silica (SiO.sub.2), preferably of silica (SiO.sub.2).