Abstract:
Process for the production of hybrid catalysts formed by mixing two catalysts; one active in Fischer-Tropsch synthesis, the other being bifunctional. Such hybrid catalyst thus formed is active both in hydrocracking and in hydroisomerisation reactions. The present invention in addition provides obtainment of a hybrid catalyst and application thereof conjointly with FT catalysts in Fischer-Tropsch synthesis reactions. The hybrid catalyst of the present invention is capable of producing in conditions typically such as those utilised in Fischer-Tropsch synthesis branched hydrocarbons in diverse bands relating to the products thereof (for example naphtha and diesel), reducing or even eliminating necessity for a subsequent hydrotreatment stage in such synthesis reactions. Utilisation of such hybrid catalysts of the present invention prolongs the operational efficiency and working life of conventional Fischer-Tropsch synthesis catalysts, reducing substantially encapsulation of particles thereof by waxes produced in the hydroprocessing reactions.
Abstract:
Provided is a catalyst composition capable of preventing decrease in catalytic activity due to grain growth of noble metal under high temperature or under change in oxidation reduction or further for long term use, and of achieving excellent catalytic activity over a long time. The catalyst composition containing a composite oxide represented by the following general formula (1):
AO·x(B 2-y C y O 3-α ) (1)
(wherein A represents an element selected from monovalent elements, divalent elements and lanthanides; B represents a trivalent element; and C represents a noble metal; x represents an integer of 1 to 6; y represents an atomic ratio satisfying the following relation: 0
Abstract:
Die vorliegende Erfindung betrifft neue Ruthenium-Katalysatoren, die erhältlich sind durch: i) ein oder mehrfaches Behandeln eines Trägermaterials auf Basis von amorphem Siliziumdioxid mit einer halogenfreien wässrigen Lösung einer niedermolekularen Rutheniumverbindung und anschliessendes Trocknen des behandelten Trägermaterials bei einer Temperatur unterhalb 200°C, ii) Reduktion des in i) erhaltenen Feststoffs mit Wasserstoff bei einer Temperatur im Bereich von 100 bis 350°C,
wobei man und Schritt ii) unmittelbar im Anschluss an Schritt i) durchführt, ein Verfahren zu ihrer Herstellung und ihre Verwendung zur katalytischen Hydrierung von Mono- und Disacchariden bei der Herstellung von Zuckeralkoholen, ausgenommen von Sorbit.
Abstract:
The invention relates to a method for producing chlorine by the catalytic gas phase oxidation of hydrogen chloride using oxygen, wherein the catalyst comprises tin dioxide and at least one ruthenium compound containing halogen. The invention also relates to a catalyst composition and the use thereof.
Abstract:
A silica gel which carries a titanium oxide photocatalyst in high concentration, characterized in that it has an average micropore diameter of 6 to 100 nm and it has a gradient of titanium oxide concentration such that a titanium oxide content of a micropore located in the vicinity of the surface of a silica gel particle is 7 to 70 wt % and is no less than 1.5 times that of a micropore located in the vicinity of the central portion of the particle; and a method for preparing the same. The silica gel has a gradient of titanium oxide concentration wherein a titanium oxide content is higher in the vicinity of the surface of a particle and lower in a central part thereof, which results in the improvement of the ability to decompose environmental pollutants or the like such as a malodorous or hazardous substance contained in air, an organic solvent contained in water and an agricultural chemical, and also has various excellent characteristics from view points of safety, economy, stability and resistance to water (no crack when placed in water).
Abstract:
The present invention relates to a process for preparing an aromatic or heteroaromatic nitrile in the presence of a supported catalyst which comprises a support having a mean diameter of ≤ 78 µm. The present invention further relates to the novel supported catalyst as such and to a process for preparing this novel supported catalyst.
Abstract:
The present invention relates to stabilized supports stable at temperatures above 800 °C, and method of preparing such supports, which includes adding a rare earth metal to an aluminum-containing precursor prior to calcining. The present invention can be more specifically seen as a support, process and catalyst wherein the stabilized alumina catalyst support comprises a rare earth aluminate with a molar ratio of aluminum to rare earth metal greater than 5:1 and, optionally, an aluminum oxide. More particularly, the invention relates to the use of catalysts comprising rhodium, ruthenium, iridium, or combinations thereof, loaded onto said stabilized supports for the synthesis gas production via partial oxidation of light hydrocarbons, and further relates to gas-to-liquids conversion processes.
Abstract:
An even titanium oxide film is economically formed on the surface of a substrate. To actualize the film formation, an aqueous titanium tetrachloride solution containing 0.1 to 17% by weight of Ti is applied in a film-like state on the surface of a heat resistant substrate. While the liquid film state is kept as it is, the aqueous titanium tetrachloride solution is heated to 300°C or more and H 2 O and HCl in the liquid film are accordingly evaporated to form a titanium oxide film. In the case where the substrate is of aluminum inferior in acid resistance, an acid-resistant film such as an oxide film is previously formed on the surface of the metal substrate.
Abstract:
A low cost support useful in chemical reactions and automotive arts is formed by rehydrating a flash calcined gibbsite in an aqueous acidic solution. The rehydrated support can be subsequently stabilized by doping with a stabilizing metal such as lanthanum. The alumina support has excellent thermal stability, high sodium tolerance, high activity with low precious metal loading, and high pore volume and surface area.