摘要:
In order to specify a catalytic converter (2),especially SCRcatalytic converter, with maximum catalytic activity, this catalytic converter has at least one catalytically active component (V) and additionally at least one porous inorganic filler component (F) having meso-or macroporosity. The organic porous filler component (F) has a proportion of about 5 to 50% by weight. More particularly, a diatomaceous earth or a pillared clay material is used as the porous inorganic filler component (F).
摘要:
The present invention relates to a pillared silicate compound comprising a layered silicate structure, and bridging metal atoms located between adjacent silicate layers of the silicate structure, wherein said bridging metal atoms form at least one covalent bond to each of the adjacent silicate layers, as well as a process for the preparation of a pillared silicate compound, and further includes a pillared silicate compound obtainable and or obtained according to said process, as well as a method of catalyzing a chemical reaction comprising the step of contacting one or more chemical compounds with the any of the aforementioned pillared silicate compounds.
摘要:
The present invention relates to hydrotalcite-like compounds, wherein Pd 2+ occupies at least part of the octrahedral sites in the brucite-like layers. According to another aspect, the invention is concerned with methods of converting these hydrotalcite-like compounds into materials comprising particles, in particular nanoparticles, of an ordered intermetallic compound of palladium and at least one constituent metal of the palladium- modified hydrotalcites. Moreover, the invention pertains to the material obtainable by the conversion method, the use of the material as a catalyst, and a process for the selective hydrogenation of alkyne(s) to the corresponding alkene(s) using the material as a hydrogenation catalyst.
摘要:
The invention relates to a catalyst for purifying NOX in the flow of exhaust gas of motor vehicles, and is characterized in that the catalyst contains modified clay minerals selected from the group consisting of bentonites, smectites, hectorites and mixtures thereof, all of which being pillared with aluminum, silicon or titanium (oxides).
摘要:
L'invention porte sur un procédé de synthèse de solides lamellaires à base de silicates comportant :
i) une étape de mélange, lors de laquelle on prépare un mélange comportant un métal alcalin, une source de silice, de l'eau et un structurant organique, et ii) une étape de cristallisation lors de laquelle on maintient ce mélange dans des conditions permettant la formation d'un solide cristallin.
Le structurant organique utilisé dans ce procédé comporte un groupement alcool et un groupement amine séparés par une chaîne hydrocarbonée.
摘要:
A method of producing metal oxide nanoparticles in an exfoliated silicate framework by forming an aqueous exfoliated silicate suspension by mixing a layered clay into water until clear. To which is added an acidic hydrated metal species precursor solution, formed by dissolving one or more transitional metal salts, and a non-ionic surfactant. This solution is then aged to precipitate a product precursor before the product precursor is separated and washed. The product precursor is calcined to form metal oxide nanoparticles in an exfoliated silicate framework.
摘要:
Molecular sieves (often loosely termed microporous materials) contain an actinide in combination with atoms selected from the group consisting of oxygen, fluorine, phosphorus, transition metals and mixtures thereof. The molecular sieve material may contain a template species, which suitably comprises an organic template molecule and/or a cationic metal species; it may also contain water. Additionally, it may contain a dopant, usually in a minor amount; suitable dopants include transition metals to modify the catalytic properties of the materials. Preferred molecular sieves comprise layered structures in which layers containing actinide in combination with atoms selected from the group consisting of oxygen, fluorine, phosphorus, transition metals and mixtures thereof have organic templates and/or cationic metal species located between them. In one class of materials, the layers contain an oxoanion (preferably a phosphate, notably orthophosphate, or a transition metal oxoanion); in this class, the actinide may usually be represented as an oxo ion, expecially an oxocation. In another class of materials, the layers contain actinide and fluorine. Exemplary materials have U/P/O or U/F frameworks.
摘要:
A novel synthetic dioctahedral smectite layered clay, a process for preparing the clay and a process using the clay is disclosed. The clays that are prepared are gallium/silicon, gallium/germanium, or aluminum/germanium smectite clays. The clay is prepared from a reaction mixture containing reactive sources of the metals, i.e., aluminum, silicon, gallium and germanium, a templating agent and water. This reaction mixture is reacted at a pH of 8.5 to 14, a temperature of 150 to 210 o C for a time of 1 to 20 days to give a desired composition. The clay compositions of the instant invention can be used to catalyze various hydrocarbon conversion processes such as alkylation and hydrocracking.