A method for producing a Guerbet alcohol, including reacting a raw material alcohol having 8 or more and 22 or less carbon atoms, in the presence of a catalyst (A) containing a first component, a second component, and a third component below: first component: copper, second component: one kind selected from the group consisting of cobalt, nickel, molybdenum, and rhenium, and third component: at least one kind selected from the group consisting of elements that are elements belonging to Groups 3 to 10 and 12 of the fourth period of the periodic table and elements belonging to Groups 3 to 7, 11, and 12 of the fifth and sixth periods of the periodic table, and are different from the element selected as the second component.

Two-part condensation curable silyl-modified polymer (SMP) based sealant compositions, in particular two-part condensation curable SMP based translucent sealant compositions containing a catalyst comprising (i) a titanate and/or zirconate and (ii) a metal carboxylate salt.

The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction of a dicarboxylic acid or an ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a water-insoluble or hardly water-soluble phosphate having on the surfaces a coating layer of titanic acid in an amount, of 0.1 to 100 parts by weight in terms of TiO.sub.2 per 100 parts by weight of the phosphate.

Provided are a catalyst structure for ozone decomposition including a support containing a porous inorganic material, and an α-MnO.sub.2 catalyst located on at least a portion of inner pores and a surface of the support, an air-cleaning method using the same, and an air-cleaning device and an air-cleaning system each including the catalyst structure for ozone decomposition.

Monodisperse polystyrene microspheres are self-assembled on a conductive surface of FTO glass by vertical deposition method to prepare three-dimensional ordered photonic crystal opal template; the three-dimensional ordered photonic crystal opal template is immersed in a solution containing rhodium source, titanium source and strontium source, and is then calcined to prepare a rhodium doped strontium titanate inverse opal material; and the rhodium doped strontium titanate inverse opal material is added to water containing pollutants, and is then subjected to illumination and/or ultrasonic treatment to complete the removal of the pollutants in the water. The three-dimensional ordered macroporous rhodium doped strontium titanate inverse opal material may be applied in the field of photocatalysis. Under the action of external force, a built-in electric field formed by the spontaneous polarization of the material may effectively separate the photo-induced carriers, which may thus enhance the photocatalytic performance and improve the photocatalytic efficiency.

This application relates to a photoactive product comprising: a catechol-containing compound, an amine-containing polymer, and photoactive material. The photoactive product can act as a photocatalyst and can be used in photoelectrodes for use in, for example, photoelectrochemical analyte sensing, including biosensing. The photoelectrodes modified with hybrid organic/inorganic materials can provide increased light absorption and charge separation, binding sites for attaching biorecognition probes, and built-in film-forming properties for well-adhered and uniform photoactive frameworks on the collector electrodes.

Catalysts for selective production of hydrogen peroxide and methods of making and using thereof have been developed. The catalysts include an alloyed or doped metal oxide which permits tuning of the catalytic properties of the catalysts for selection of a desired pathway to a product, such as hydrogen peroxide. The catalysts may be incorporated into electrochemical or photochemical devices.

Provided is halloysite powder including a granule in which halloysite including halloysite nanotubes and titanium oxide are aggregated. The granule includes a first pore derived from a tube hole of the halloysite nanotubes, and a second pore different from the first pore.

A molding catalyst satisfying the following formula (1):

0.800≤W.sub.AV/W.sub.C≤0.875  (1) wherein W.sub.AV is determined by the following formula (2) and W.sub.C is determined by the following formula (3):

W.sub.AV=W.sub.tot/n  (2) wherein W.sub.tot is a total weight of freely-selected n pieces of the molding catalyst,

W.sub.C=(V.sub.AV.Math.ρ)/(1+V.sub.P.Math.ρ)  (3) wherein V.sub.AV is an average of volumes of virtual cylinders each respectively having, as its height and diameter, a major axis (L) and a minor axis (D) of each of the freely-selected n pieces of the molding catalyst, ρ is a true density of the molding catalyst, and V.sub.P is a pore volume per unit weight of the molding catalyst.

A precious metal-supported eggshell catalyst with a preparation method and an application are provided. The precious metal-supported eggshell catalyst includes a carrier, a precious metal and a promoter. As an active component, the precious metal and the promoter are evenly distributed on surface of the carrier, wherein the promoter includes one or more than two of a precious metal, an alkaline earth metal, a transition metal lanthanide series metal, an actinium series metal and/or a metal oxide thereof. With a highly utilization of the precious metal, the precious metal-supported eggshell catalyst showed high conversion, good selectivity and excellent stability, and the precious metal-supported eggshell catalyst is used more than 300 hours with no obvious loss of activity in preparing 1,3-propanediol through hydrogenation of 3-hydroxypropionaldehyde aqueous solution. Furthermore, with large particles the precious metal-supported eggshell catalyst is easily separated from reaction products.