Abstract:
The present invention relates to spherical beads comprising at least one metal and/or semimetal oxide, having a mean diameter in the range from 10 to 120 μm, a BET surface area in the range from 400 to 800 m2/g and a pore volume in the range from 0.3 to 3.0 cm3/g, wherein the diameter of a given bead at any one point of said bead deviates by less than 10% from the average diameter of said bead and the surface of said bead is substantially smooth, and also to a process for producing these spherical beads, to a particulate catalyst comprising the spherical beads and to the use of the spherical beads as catalysts or catalyst carriers.
Abstract:
Disclosed are: a visible-light-responsive titanium oxide microparticle dispersion comprising an aqueous dispersion medium and titanium oxide microparticles dispersed therein, and a peroxotitanium component, an iron component and/or a copper component and a tin component, wherein the content of the peroxotitanium component is 0.1 to 20 mass % relative to the titanium oxide content; and a process for producing a visible-light-responsive titanium oxide microparticle dispersion, comprising (1) producing peroxotitanic acid containing a tin compound from a raw material titanium compound, a tin compound and hydrogen peroxide, (2) heating an aqueous solution of peroxotitanic acid containing the tin compound to 80 to 250° C. under a high pressure to produce a titanium oxide microparticle dispersion containing a peroxotitanium component and a tin component, and (3) adding an iron compound and/or a copper compound to the titanium oxide microparticle dispersion to cause a reaction between the iron compound and/or the copper compound with the dispersion.
Abstract:
A catalytic composition is disclosed, which exhibits an X-ray amorphous oxide, with a spinel formula and highly dispersed crystals of ZnO, CuO, and optionally CeO2. The composition is useful in oxidative processes for removing sulfur from gaseous hydrocarbons.
Abstract:
A process for making a ceramic catalyst material includes mixing a catalyst precursor material with a mineral particulate to form a mixture; adding a binder, silicon carbide, and a parting agent to the mixture to form unfired spheroids; and heating the unfired spheroids at a temperature effective to oxidize the silicon carbide and the catalyst precursor material to form the ceramic catalyst material. In another embodiment, the process includes the addition of a catalyst metal oxide salt to an aluminosilicate hydrogel aggregate mixture. Once the mixture sets, the set mixture is heated to a temperature to effective to produce a high surface area ceramic catalyst material.
Abstract:
The present invention provides a supported catalyst for synthesizing carbon nanotubes. The supported catalyst includes a metal catalyst supported on a supporting body, and the supported catalyst has a surface area of about 15 to about 100 m2/g. The supported catalyst for synthesizing carbon nanotubes according to the present invention can lower production costs by increasing surface area of a catalytic metal to thereby allow production of a large amount of carbon nanotubes using a small amount of the catalyst.
Abstract:
A hollow carbon sphere having a carbon shell and an inner core is disclosed. The hollow carbon sphere has a total volume that is equal to a volume of the carbon shell plus an inner free volume within the carbon shell. The inner free volume is at least 25% of the total volume. In some instances, a nominal diameter of the hollow carbon sphere is between 10 and 180 nanometers.
Abstract:
A catalyst and process for hydrotreating and/or hydroconverting heavy metal-containing hydrocarbon feeds, said catalyst comprising a support in the form of beads based on alumina, at least one catalytic metal or a compound of a catalytic metal from group VIB (column 6 in the new periodic table notation), optionally at least one catalytic metal or compound of a catalytic metal from group VIII (columns 8, 9 and 10 of the new periodic table notation), with a pore structure composed of a plurality of juxtaposed agglomerates, each formed by a plurality of acicular platelets, the platelets of each agglomerate being generally radially orientated with respect to each other and with respect to the center of the agglomerate. The catalyst also comprises at least one doping element selected from the group constituted by phosphorus, boron, silicon (or silica which does not belong to that which could be contained in the selected support) and halogens.
Abstract:
A process for preparing beads of various compositions has been developed. The process involves preparing a reaction mixture of sources of framework elements of a molecular sieve. The reaction mixture can optionally contain molecular sieve seeds. Additional sources of the framework elements are added to give a concentration above the critical supersaturation limit thereby forming beads. Depending on the composition of the reaction mixture and the reaction conditions one can obtain beads which are substantially amorphous, to beads that are substantially crystalline molecular sieve. These beads in turn can be further processed to deposit a molecular sieve layer onto the beads.
Abstract:
A process for preparing shaped catalyst bodies whose active composition is a multielement oxide, in which a finely divided precursor mixture with addition of graphite having a specific particle size is shaped to the desired geometry and then treated thermally.
Abstract:
A catalytically active porous element for promoting catalytic gas phase reactions is proposed, said element comprising a porous structural element of sintered ceramic or metallic primary particles, which are selected from fibrous and/or granular particles, a secondary structure of titania nano particles deposited on the surface of said sintered primary particles and a catalytic component deposited on the surface of the titania nano particles. Thereby porous catalytic elements for catalytic gas phase reactions which are useful not only in NOX reduction reactions but also for other catalytic gas phase reactions are provided.
Abstract translation:提出了用于促进催化气相反应的催化活性多孔元件,所述元件包括选自纤维和/或粒状颗粒的烧结陶瓷或金属一次粒子的多孔结构元件,沉积在其上的二氧化钛纳米颗粒的二级结构 所述烧结的一次粒子的表面和沉积在二氧化钛纳米颗粒的表面上的催化组分。 因此,提供用于催化气相反应的多孔催化元件,其不仅可用于NO X X还原反应,而且可用于其它催化气相反应。