A photocatalyst, represented by the following general formula (1):
X(VO.sub.4).sub.6(OH).sub.2General Formula (1) wherein X represents Z.sub.a1Ti.sub.b1 or Z.sub.a2Ti.sub.b2Ag.sub.c2 (where Z is Ca or Sr; a1 is 7.0 to 9.5; b1 is 0.5 to 3.0; a2 is 7.0 to 9.5; b2 is 0.4 to 1.5; c2 is 0.1 to 2.0; a1+b1 is 9.0 to 10.0; and a2+b2+c2 is 9.0 to 10.0) in the general formula (1).

The present application provides a method for preparing acetal carbonyl compound used as an intermediate for producing ethylene glycol, which comprises a step in which a raw material acetal and a raw gas carbon monoxide go through a reactor loaded with a catalyst containing an acidic microporous silicoaluminophosphate molecular sieve, for carrying out a carbonylation reaction. In the method of the present invention, the conversion rate of the raw material acetal is high, and the selectivity of acetal carbonylation is high, and the catalyst life is long, and no additional solvent is needed in the reaction process, and the reaction condition is relatively mild, and the process is continuous, showing the potential for industrial application. Moreover, the product of acetal carbonyl compound can be used for producing ethylene glycol by hydrogenation followed by hydrolysis.

Embodiments of the invention are directed to Z-scheme photocatalyst for efficient hydrogen generation from water. The Z-scheme photocatalyst can include a hybrid metal that includes a semiconductor material/M1/Cd.sub.xM.sub.1xS material. M1 can be transition metal and M can Zn, Fe, Cu, Sn, Mo, Ag, Pb and Ni.

Embodiments of the invention are directed to Z-scheme photocatalyst for efficient hydrogen generation from water. The Z-scheme photocatalyst can include a hybrid metal that includes a semiconductor material/M1/Cd.sub.xM.sub.1xS material. M1 can be transition metal and M can Zn, Fe, Cu, Sn, Mo, Ag, Pb and Ni.

Provided is a novel exhaust gas purification catalyst, which uses a Cu-based delafossite oxide, capable of increasing the exhaust gas purification performance compared to the case of using the Cu-based delafossite oxide alone. Proposed is an exhaust gas purification catalyst comprising a delafossite-type oxide represented by a general formula ABO.sub.2 and an inorganic porous material, wherein Cu is contained in the A site of the general formula of the delafossite oxide, one or two or more elements selected from the group consisting of Mn, Al, Cr, Ga, Fe, Co, Ni, In, La, Nd, Sm, Eu, Y, V, and Ti are contained in the B site thereof, and Cu is contained in 3 to 30% relative to the total content (mass) of the delafossite-type oxide and the inorganic porous material.

Provided is a novel exhaust gas purification catalyst, which uses a Cu-based delafossite oxide, capable of increasing the exhaust gas purification performance compared to the case of using the Cu-based delafossite oxide alone. Proposed is an exhaust gas purification catalyst comprising a delafossite-type oxide represented by a general formula ABO.sub.2 and an inorganic porous material, wherein Cu is contained in the A site of the general formula of the delafossite oxide, one or two or more elements selected from the group consisting of Mn, Al, Cr, Ga, Fe, Co, Ni, In, La, Nd, Sm, Eu, Y, V, and Ti are contained in the B site thereof, and Cu is contained in 3 to 30% relative to the total content (mass) of the delafossite-type oxide and the inorganic porous material.

Provided is a photocatalyst layer that improves the photocatalytic performance while suppressing detachment of photocatalyst particles. The photocatalyst layer has a front surface and a rear surface on the opposite side of the front surface. The photocatalyst layer includes photocatalyst particles and a binder. The photocatalyst layer has a first region containing the photocatalyst particles and a second region containing the binder and not containing the photocatalyst particles. The photocatalyst particles include tungsten oxide particles. The photocatalyst particles have contact points being in contact with the rear surface. The ratio of the thickness of the second region to the number-average secondary particle diameter of the photocatalyst particles is 0.20 or more and 0.80 or less.

The present invention relates to diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) catalyst compositions, used for a smoke reduction apparatus, for inhibiting white smoke generated from a diesel engine and, more specifically, to a DOC, enabling minimization of sulphate adsorption, a DPF catalyst, enabling a sulphate desorption delay, and a smoke reduction apparatus having the DOC and DPF catalyst assembled therein. The diesel particulate filter catalyst composition, which is applied to the DPF, comprises oxide components selected from oxide components comprising manganese oxide and silver oxide.

The invention discloses a binder-free high strength and low steam-to-oil ratio ethylbenzene dehydrogenation catalyst, which is characterized by comprising the following components in percentage by weight: (a) 60-85% Fe.sub.2O.sub.3; (b) 3-25% K.sub.2O; (c) 0.1-5% MoO.sub.3; (d) 3-20% CeO.sub.2; (e) 0.1-5% CaO; (f) 0.1-5% Na.sub.2O; (g) 0.1-5% MnO.sub.2, wherein the weight ratio of sodium oxide to manganese dioxide is 0.1-10, and no binder is added during the preparation of the catalyst. The low steam-to-oil ratio ethylbenzene dehydrogenation catalyst provided by the present invention contains no binder and maintains high strength, and has high activity and stability at low steam-to-oil ratio.

The invention discloses a binder-free high strength and low steam-to-oil ratio ethylbenzene dehydrogenation catalyst, which is characterized by comprising the following components in percentage by weight: (a) 60-85% Fe.sub.2O.sub.3; (b) 3-25% K.sub.2O; (c) 0.1-5% MoO.sub.3; (d) 3-20% CeO.sub.2; (e) 0.1-5% CaO; (f) 0.1-5% Na.sub.2O; (g) 0.1-5% MnO.sub.2, wherein the weight ratio of sodium oxide to manganese dioxide is 0.1-10, and no binder is added during the preparation of the catalyst. The low steam-to-oil ratio ethylbenzene dehydrogenation catalyst provided by the present invention contains no binder and maintains high strength, and has high activity and stability at low steam-to-oil ratio.