摘要:
The present invention refers to a process for preparing mesoporous carbon loaded with a catalytically active metal and/or metal oxide nanoparticles, the so-obtained mesoporous carbon and the use thereof as a catalyst in a transfer hydrogenation process of α,β-unsaturated aldehydes to unsaturated alcohols.
摘要:
An exhaust system for an internal combustion engine, the exhaust system comprising, a lean NO x trap (LNT), a wall flow monolithic substrate having a NO x storage and reduction zone thereon, the wall flow monolithic substrate having a pre-coated porosity of 40% or greater, the NO x storage and reduction zone comprising a platinum group metal loaded on a first support, the first support comprising one or more alkaline earth metal compounds, a mixed magnesium / aluminium oxide, cerium oxide, and at least one base metal oxide selected the group consisting of copper oxide, manganese oxide, iron oxide and zinc oxide.
摘要:
The present invention pertains to a process for preparing a catalyst composition comprising the successive steps of (i) loading a microalgae with one or more heavy metals and (ii) thermally and optionally chemically treating said microalgae so as to obtain said catalyst composition. This invention also pertains to the catalyst composition thus obtained and to its use for catalyzing organic synthesis reactions.
摘要:
A method is provided for improving the performance of a silver-based epoxidation catalyst comprising a carrier. The carrier includes at least 80 percent alpha alumina and has a pore volume from 0.3 mL/g to 1.2 mL/g, a surface area from 0.3 m 2 /g to 3.0 m 2 /g, and a pore architecture that provides at least one of a tortuosity of 7 or less, a constriction of 4 or less and a permeability of 30 mdarcys or greater. A catalytic amount of silver and a promoting amount of one or more promoters is disposed on and/or in said carrier. The method further includes the steps of initiating an epoxidation reaction by reacting a feed gas composition containing ethylene and oxygen present in a ratio of from about 3.5:1 to about 12:1, in the presence of the silver-based epoxidation catalyst at a temperature of about 200°C to about 230°C, and subsequently increasing the temperature either stepwise or continuously.
摘要:
This invention provides a catalyst comprising a new form of ZnFe 2 O 4 spinel nanoparticles, and a method for preparing same. The catalyst is useful for catalyzing the esterification of fatty acids or transesterification of triglycerides, wherein the reaction rate and conversion can be enhanced by free fatty acids.
摘要翻译:本发明提供了包含新形式的ZnFe 2 O 4尖晶石纳米颗粒的催化剂及其制备方法。 该催化剂可用于催化脂肪酸的酯化或甘油三酸酯的酯交换反应,其中反应速率和转化率可以通过游离脂肪酸增强。
摘要:
Process for the manufacture of at least one alcohol and/or at least one ketone, which comprises a step during which at least one organic peroxide compound is put into contact with at least one catalyst responding to formula (I) CrN x O y Formula (I) in which x is a number varying from 0.10 to 1.00 and y is a number varying from 0.00 to 1.50, in order to produce the at least one alcohol and/or at least one ketone.
摘要:
A catalyst comprising particles of iridium oxide and a metal oxide (M oxide), wherein the metal oxide is selected from the group consisting of a Group 4 metal oxide, a Group 5 metal oxide, a Group 7 metal oxide and antimony oxide, wherein the catalyst is prepared by subjecting a precursor mixture to flame spray pyrolysis, wherein the precursor mixture comprises a solvent, an iridium oxide precursor and a metal oxide precursor is disclosed. The catalyst has particular use in catalysing the oxygen evolution reaction.