Abstract:
A catalyst composition contains an inorganic porous material with pore diameters of at least 2 nm and of crystals of molecular sieve. The crystals of molecular sieve have an average diameter, measured by scanning electron microscopy, not bigger than 50 nm. The catalyst composition has a concentration of acid sites ranges from 50 to 1200 μmol/g measured by TPD NH3 adsorption. An XRD pattern of the catalyst composition is the same as an XRD pattern of the inorganic porous material.
Abstract:
The present subject matter describes a catalyst composition based on sodium tantalate, a modifying agent and at least one co-catalyst and the process of preparing the catalyst composition. The process for photocatalytic reduction of CO2 comprises re-acting carbon dioxide and alkaline water in the presence of catalyst composition that is irradiated with radiation with wavelength in the range of 300-700 nm to produce lower hydrocarbons and hydrocarbon oxygenates.
Abstract:
Es wird eine Katalysatorzusammensetzung zur Verfügung gestellt, die mindestens ein Edelmetall und mindestens ein Mischoxid umfassend Zirconiumdioxid und Siliciumdioxid umfasst. Das Edelmetall ist geträgert und der Träger besteht nicht aus dem Mischoxid. Das Massenverhältnis von Zirconiumdioxid zu Siliciumdioxid im Mischoxid beträgt 86 : 14 bis 99,9 : 0,1. Das Katalysatorsystem kann zur Herstellung eines Ketons aus einer mindestens eine Epoxidgruppe enthaltenden Verbindung verwendet werden
Abstract:
The invention is directed to a catalyst composition comprising a mesoporous catalyst support and oxides of nickel (Ni), cobalt (Co) and magnesium (Mg). to a process for the production of the catalyst composition and to the use of the catalyst composition for the production of a syngas.
Abstract:
It is therefore the objective of the present invention to provide a method for the production of SNG taking advantage from a catalyst which has a high selectivity for the catalytic reactions and achieves long lifetime of the catalyst due to minor clogging and strong carbon resistance to prevent its deactivation. These objectives are achieved according to the present invention by a method to convert a CO and/or CO 2 comprising a gas mixture stemming from an industrial processes, such as gasification of carbonaceous feedstocks (i.e. biomass), pyrolysis, ore conversion, combustion, calcination or fermentation, wherein the gas mixture further comprises saturated hydrocarbons in concentrations above 15% and/or unsaturated hydrocarbons, such as olefins, tars and/or aromatic compounds, into a methane rich gas by bringing the gas mixture into a contact with a supported metal catalyst comprising: a) as an active phase nickel and optionally cobalt, ruthenium, iridium, molybdenum, iron or any possible combination thereof, b) as a promoter boron and optionally sodium, potassium, calcium, magnesium, boron, rubidium, barium, gallium, phosphorus or any possible combinations thereof, and c) as a support alumina and optionally silica, titania, lanthana, zirconia, ceria, magnesia or any possible combination thereof. The presented invention improves the carbon resistance of nickel catalysts for low temperature (250-400°C) applications such as the methanation. Polymeric carbon is formed by reaction of carbon atoms on the catalyst surface under locally hydrogen-deficient situations. These carbon atoms stem from dissociation of carbon oxides and hydrocarbons whereby unsaturated hydrocarbons (ethylene, acetylene) and CO lead to higher carbon deposition rates. Using presently the promoter boron in the nickel catalyst avoids the formation of intermediates for polymeric carbon. As a second benefit, the formation of nickel carbides and carbon whiskers is decreased, too.
Abstract:
Hydrotreating catalysts and processes useful for the conversion of methoxylated aromatic compounds to simple aromatic compounds are provided. The catalysts comprise transition metal selected from the group consisting of Group 8 metals, Group 9 metals, Group 10 metals, Group 11 metals, and mixtures thereof, and catalyst support selected from the group consisting of shape-selective zeolite, silica, titania, zirconia, and mixtures thereof.
Abstract:
Catalysts and articles useful for selective catalytic reduction (SCR) are disclosed. The catalyst comprises a cerium oxide and an octahedral molecular sieve (OMS) comprising manganese oxide. The catalysts, which comprise 0.1 to 50 wt.% of cerium, can be made by doping, ion-exchange, deposition, or other techniques. Also disclosed is an SCR process in which a gaseous mixture comprising nitrogen oxides is selectively reduced in the presence of a reductant and the cerium-modified OMS catalyst. The cerium-modified manganese oxide OMS catalysts offer unexpected advantages for selective catalytic reduction, especially NH 3 -SCR, including improved thermal stability and improved activity for NOx conversion, especially at relatively low temperatures (100°C to 250°C).
Abstract:
The present disclosure relates to a photocatalytic composition comprising photocatalytic titanium dioxide particles being dispersed in a continuous phase, and at least one anti-photogreying additive, wherein said at least one anti-photogreying additive is adapted to limit photogreying of said titanium dioxide particles while the photocatalytic activity of said titanium dioxide particles is maintained, and wherein the photo greying index (ΔL) of said composition is less than 6.