Abstract:
Catalysts are disclosed comprising fibrous substrates having silica-containing fibers with diameters generally from 1 to 50 microns, which act effectively as "micro cylinders." Such catalysts can dramatically improve physical surface area, for example per unit length of a reactor or reaction zone. At least a portion of the silica, originally present in the silica- containing fibers of a fibrous material used to form the fibrous substrate, is converted to a zeolite ( e.g. , having a SiO 2 /AI 2 O 3 ratio of at least 150) that remains deposited on these fibers. The fibrous substrates possess important properties, for example in terms of acidity, which are useful in hydroprocessing ( e.g. , hydrotreating or hydrocracking) applications.
Abstract translation:公开了包含具有通常为1至50微米的直径的含二氧化硅的纤维的纤维基材的催化剂,其有效地作为“微型气瓶”起作用。 这样的催化剂可以显着改善物理表面积,例如每单位长度的反应器或反应区。 原来存在于用于形成纤维基质的纤维材料的含二氧化硅的纤维中的二氧化硅的至少一部分转化成保持沉积在其上的沸石(例如,具有至少150的SiO 2 / Al 2 O 3比例) 这些纤维。 纤维基质具有重要的性质,例如在酸性方面,其可用于加氢处理(例如加氢处理或加氢裂化)应用。
Abstract:
Low temperature activity and high temperature ammonia selectivity of a vanadium-free selective catalytic reduction catalyst are controlled with a mixed oxide support containing oxides of titanium and zirconium, and a plurality of alternating layers respectively formed of a metal compound and titanium oxide present on the surface of the mixed oxide support. The metal compound is selected from the group consisting of manganese oxide, iron oxide, cerium oxide, tin oxide, and mixtures thereof.
Abstract:
Provided is a diesel oxidation catalyst for the treatment of exhaust gas emissions from a diesel engine and a method for treating a diesel exhaust gas stream, the method comprising providing a diesel oxidation catalyst and contacting said diesel exhaust gas stream with said diesel oxidation catalyst for the treatment of exhaust gas emissions. More particularly, the present invention is directed to a catalyst structure comprising three distinct layers; in which layer comprises a precious metal component such as palladium is located between two hydrocarbon storage layers comprising a molecular sieve such as a zeolite.
Abstract:
Method for the production of supported activated metal catalysts, whereby an alloy, a metal powder, a pore builder is dispersed in a water, the dispersion is sprayed on a support which is the dried, calcined and activated. The catalysts can be used for organic transformations, i.e. for hydrogenation reactions.
Abstract:
Die Erfindung betrifft ein Verfahren zur Oxidation von Ammoniak, das dadurch gekennzeichnet ist, dass als Katalysator mit katalytisch aktiven Materialien beschichtete Raumkörper aus hochtemperaturstabilem Material, enthaltend eine Fe-Cr-Al-Legierung, einsetzt werden, sowie den dafür geeignete Katalysator selbst. Gegenstände der Erfindung sind weiterhin ein Verfahren und eine entsprechende Vorrichtung zur Herstellung von Salpetersäure.
Abstract:
The present invention includes a catalyst having a layered structure with, (1) a porous support, (2) a buffer layer, (3) an interfacial layer, and optionally (4) a catalyst layer. The invention also provides a process in which a reactant is converted to a product by passing though a reaction chamber containing the catalyst.
Abstract:
The present invention includes a catalyst having a layered structure with, (1) a porous support, (2) a buffer layer, (3) an interfacial layer, and optionally (4) a catalyst layer. The invention also provides a process in which a reactant is converted to a product by passing though a reaction chamber containing the catalyst.
Abstract:
The present invention relates generally to a relatively stable magnetic photocatalyst comprising an insulated magnetite core coated with a layer of photoactive titanium dioxide. In one example the insulation layer is silicone dioxide which blocks direct electrical contact between the titanium dioxide and the magnetite.
Abstract:
O pedido de lide revela um processo para produção de hidrogénio por decomposição catalítica de amónia, proveniente de unidades de águas ácidas. Numa primeira etapa, a corrente de amónia é purificada por contato com diferentes leitos.catalíticos, removendo-se cloretos e enxofre, sendo que, especificamente, no leito constituído por catalisador a base de alcalinos e alcalinos terrosos, suportados em óxido de zinco, alumina, sílica-alumina e misturas, com óxido de níquel como fase ativa, tem-se ainda uma transformação parcial da amónia em hidrogénio. Na segunda etapa, a corrente amoniacal purificada é alimentada no reator de reforma a vapor para geração de hidrogénio que, posteriormente, é purificado. Consta ainda no pedido o catalisador usado no processo.