PROCESS FOR REDUCING THE AGING-RELATED DEACTIVATION OF HIGH SELECTIVITY ETHYLENE OXIDE CATALYSTS

    公开(公告)号:US20240279193A1

    公开(公告)日:2024-08-22

    申请号:US18571443

    申请日:2022-09-19

    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.

    Systems and methods for providing ZPGM perovskite catalyst for diesel oxidation applications
    6.
    发明授权
    Systems and methods for providing ZPGM perovskite catalyst for diesel oxidation applications 有权
    提供ZPGM钙钛矿催化剂用于柴油氧化应用的系统和方法

    公开(公告)号:US09498767B2

    公开(公告)日:2016-11-22

    申请号:US13904271

    申请日:2013-05-29

    发明人: Zahra Nazarpoor

    IPC分类号: B01J23/68 B01J23/00 B01D53/94

    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。