摘要:
Disclosed herein are methods of improving the life of high selectivity, silver catalysts for making ethylene oxide. Ethylene and oxygen are reacted over the high efficiency catalyst with at least one organic chloride modifier, and during a catalyst aging period of no less than 0.03 kt ethylene oxide/cubic meter catalyst, the overall catalyst chloriding effectiveness never exceeds an efficiency-maximizing optimum overall catalyst chloriding effectiveness value that corresponds to a reference feed gas composition and a set of reference reaction condition values. Reaction temperature and/or feed gas oxygen concentration are adjusted to obtain or maintain a desired value of an ethylene oxide production parameter. Once the reaction temperature and/or oxygen concentration vary by a specified amount from their respective reference values in the set of reference reaction condition values, the overall catalyst chloriding effectiveness is changed to account for a shift in the optimum (efficiency-maximizing) value.
摘要:
A supported catalyst for decomposing an organic substance that includes a support and a catalyst particle supported on the support. The catalyst particle contains a perovskite-type composite oxide represented by AxByMzOw, where the A contains at least one selected from Ba and Sr, the B contains Zr, the M is at least one selected from Mn, Co, Ni and Fe, y+z=1, x≥0.995, z≤0.4, and w is a positive value satisfying electrical neutrality. A film thickness of a catalyst-supporting film supported on the support and containing the catalyst particle is 5 μm or more, or a supported amount as determined by normalizing a mass of the catalyst particle supported on the support by a volume of the support is 45 g/L or more.
摘要:
A method for preparing acrylic acid, more specifically, to a method for preparing acrylic acid under a neutral condition at high yield in a short time without using a base, unlike the prior art in which a base is essentially used. The acrylic acid is produced using a supported catalyst having a specific composition when preparing acrylic acid by oxidation of allyl alcohol. Particularly, the preparation method can recover acrylic acid rather than acrylic acid salt as a final product, and thus has an advantage that the overall process cost can be reduced by eliminating essential processes in the prior art, such as ion exchange after the acidification process required for the conversion of acrylic acid salt to acrylic acid.
摘要:
An exhaust gas treatment device capable of treating exhaust gas of a gas turbine or a gas engine includes an exhaust gas treatment catalyst comprising a perovskite composite oxide containing at least Ag and Dy in an A site and at least Mn in a B site.
摘要:
A method of preparing 4-methyl-3-decen-5-one. The method includes the step of oxidizing 4-methyl-3-decen-5-ol in the presence of (i) oxygen and (ii) a metal catalyst, wherein the metal catalyst contains a catalytic metal deposited on nanoparticle support.
摘要:
Diesel oxidation ZPGM catalyst systems using Y1-x AgxMnO3 perovskite are disclosed. The ZPGM catalyst system compositions may include Y1-x AgxMnO3 perovskite in impregnation component and at least one carrier material oxide in washcoat. The ZPGM catalyst system compositions may also include Y1-x AgxMnO3 perovskite co-precipitated in a carrier material oxide as washcoat. The catalyst activity is measured with an inlet gas mixture containing diesel exhaust composition and characterized according to performance in NO oxidation, NO2 production, NO storage capability and diesel oxidation applications.
摘要翻译:公开了使用Y1-x AgxMnO3钙钛矿的柴油氧化ZPGM催化剂体系。 ZPGM催化剂体系组合物可以包括在浸渍组分中的Y1-x Ag x MnO 3钙钛矿和在修补基面涂层中的至少一种载体材料氧化物。 ZPGM催化剂体系组合物还可以包括在作为修补基面涂层的载体材料氧化物中共沉淀的Y1-x AgxMnO3钙钛矿。 催化剂活性用含有柴油机废气组成的入口气体混合物测量,并根据NO氧化,NO2生产,NO储存能力和柴油氧化应用的性能进行表征。
摘要:
The present invention relates to an alumina support for silver catalyst, a process for preparing said alumina support, a silver catalyst made from said alumina support, and a use of said silver catalyst in the production of ethylene oxide by the oxidization of ethylene. According to the present invention, the silver catalyst made from the support prepared by potassium melt technology can have a high selectivity.
摘要:
A method for producing a multisubstituted biphenyl compound is represented by the following formula (2), including a step of coupling a substituted benzene compound represented by the following formula (1) in the presence of a solid catalyst with gold immobilized onto a support.
摘要:
A component part has a catalyst surface. This surface has metallic components and components of MnO2 (13) in contact with the former. The metallic components are preferably formed of Ag and/or Ni. These material pairs achieve a great improvement in catalyst action compared to the pure metals. Especially in the case of use of Ni, which is toxicologically safe, these surfaces, for example, may also find use in ambient air purification for reduction of the ozone content. The surface can be applied, for example, by a coating of the component part, in which case the metallic component and the component of MnO2 are applied in two layers.
摘要:
A carrier having at least three lobes, a first end, a second end, a wall between the ends and a non-uniform radius of transition at the intersection of an end and the wall is disclosed. A catalyst comprising the carrier, silver and promoters deposited on the carrier and useful for the epoxidation of olefins is also disclosed. A method for making the carrier, a method for making the catalyst and a process for epoxidation of an olefin with the catalyst are also disclosed.