The manufacturing method includes a step of mixing a coarse particle zeolite, a fine particle zeolite, and a raw material of an inorganic bonding material to prepare a zeolite raw material; a step of forming the prepared zeolite raw material into a honeycomb shape to prepare a honeycomb formed body; and a step of firing the prepared honeycomb formed body to prepare the honeycomb structure. In the step of preparing the zeolite raw material, as the coarse particle zeolite, a chabazite type zeolite having a specific average particle diameter, the fine particle zeolite having a specific average particle diameter, the raw material of the inorganic bonding material which includes at least basic aluminum lactate is used.

The invention provides a process for the production of titania particles with a desired morphology. The process comprises providing a titania sol and then drying the sol to provide dried titania particles. The process is characterized in that the morphology of the dried titania particles is controlled by applying one or more of the following criteria: (a) the titania sol is produced from a TiO.sub.2 containing slurry obtained using a precipitation step in a sulphate process, wherein the size of micelles formed during the precipitation is controlled; (b) the titania sol is produced from a TiO.sub.2 containing slurry and the pH of the slurry is controlled in order to affect the extent to which the titania sol is flocculated; (c) the titania sol is produced from a TiO.sub.2 containing slurry and the iso-electric point of the titania is adjusted in order to affect the extent to which the titania sol is flocculated; (d) the titania sol is dried by application of heat and the temperature used during the drying step is controlled.

The present invention relates to a selective catalytic reduction catalyst comprising a porous wall-flow filter substrate; wherein in the pores of the porous internal walls and on the surface of the porous internal walls, the catalyst comprises a selective catalytic reduction coating comprising a selective catalytic reduction component comprising a zeolitic material comprising one or more of copper and iron. The present invention further relates to a process for preparing a selective catalytic reduction catalyst using particles of a carbon-containing additive and an aqueous mixture comprising said particles of a carbon-containing additive.

A catalyst structure that allows prevention of aggregation of fine particles of a functional substance, suppresses decrease of catalyst activity, and thus enables extension of the lifetime of the catalyst structure. A catalyst structure has a carrier that is formed from a zeolite-type compound and has a porous structure. The functional substance includes a first element that is at least one metallic element selected from the group consisting of cobalt (Co), nickel (Ni), iron (Fe), and ruthenium (Ru), and at least one second element selected from the group consisting of metallic elements in group 1, group 2, group 4, group 7, and group 12 on the periodic table. The carrier has paths connected to each other. The functional substance is present in at least the paths of the carrier.

A method of catalytic hydrogenation and reduction in which a reactive substrate and a hydrogen source are brought into contact in the presence of a platinum-group metal-supported catalyst to run the reactive substrate through catalytic hydrogenation and reduction; the ion exchanger is made of a continuous skeleton phase and a continuous hole phase; the thickness of the continuous skeleton is in the range of 1-100 ?m; the average diameter of the continuous holes is in the range of 1-1000 ?m; the total pore volume is in the range of 0.5-50 mL/g; the ion exchange capacity per unit weight in a dry state is in the range of 1-9 mg eq/g; and the ion exchanger is a non-particulate, weakly basic, organic porous ion exchanger where an ion exchange group is distributed in the ion exchanger.

[Problem] To provide a catalyst for hydrotreating a heavy hydrocarbon oil, the catalyst exhibiting excellent demetallization performance, desulfurization performance, and deasphaltene performance and having high strength. [Solution] A hydrotreating catalyst, which is a catalyst for hydrotreating a heavy hydrocarbon oil, the catalyst including an alumina-phosphorus oxide carrier, and a hydrogenation-active metal component supported on the carrier, in which the content of phosphorus in the carrier is 0.4 to 2.0 mass % in terms of P.sub.2O.sub.5, the carrier has a local maximum value of the differential pore volume distribution in a pore diameter range of 18 to 22 nm measured by mercury intrusion porosimetry, in the carrier, the ratio (?PV/PV.sub.T) of a volume (?PV) of pores having a pore diameter in a range deviating from a range of a pore diameter at the local maximum value?2 nm to the total pore volume (PV.sub.T) measured by mercury intrusion porosimetry is 0.50 or less, and the crystalline form of a portion of alumina in the alumina-phosphorus oxide carrier is ?-alumina.

A hydrogenation method for an aromatic polymer includes the step of: bringing an aromatic polymer into contact with a hydrogenation reagent in the presence of a hydrogenation catalyst so as to hydrogenate at least some aromatic rings in the aromatic polymer. The hydrogenation catalyst contains a carrier and a platinum element, a group IVA element and a rare earth metal element loaded on the carrier, and the carrier is alumina. Hydrogenated block copolymers, hydrogenated five-block copolymers and hydrogenated seven-block copolymers can be produced using the hydrogenation method, which hydrogenates the aromatic ring in the aromatic polymer to obtain a higher aromatic ring hydrogenation degree. The hydrogenated block copolymers have a high hydrogenation degree, high light transmittance, low haze, and excellent impact toughness.

Disclosed is a catalyst composition and its use in a process for the conversion of a feedstock containing C.sub.8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst composition comprises a first zeolite having a constraint index of 3 to 12, a second zeolite comprising a mordenite zeolite synthesized from TEA or MTEA, at least one first metal of Group 10 of the IUPAC Periodic Table, and at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said mordenite zeolite has a mesopore surface area of greater than 30 m.sup.2/g and said mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.

The exhaust gas purification device includes: a substrate of wall flow structure having inlet cells, outlet cells and a porous partition wall; and a catalyst layer provided in at least part of internal pores of the partition wall and held on the surface of the internal pores. The relationship between an average filling factor A of the catalyst layer held in pores having a pore diameter of 5 m to less than 10 m, an average filling factor B of the catalyst layer held in pores having a pore diameter of 10 m to less than 20 m and an average filling factor C of the catalyst layer held in pores having a pore diameter of 20 m to less than 30 m, among the internal pores of the partition wall 16 in which the catalyst layer is held, satisfies the following expression: A<B<C.

The present invention relates to novel sulfur-doped carbonaceous porous materials. The present invention also relates to processes for the preparation of these materials and to the use of these materials in applications such as gas adsorption, mercury and gold capture, gas storage and as catalysts or catalyst supports.