Process for preparing attrition resistant zeolitic layered catalyst composition
    39.
    发明授权
    Process for preparing attrition resistant zeolitic layered catalyst composition 有权
    制备耐磨沸石层状催化剂组合物的方法

    公开(公告)号:US06710003B2

    公开(公告)日:2004-03-23

    申请号:US10022024

    申请日:2001-12-13

    IPC分类号: B01J2904

    摘要: A layered catalyst composition is disclosed where the composition is prepared by bonding an outer layer comprising a bound zeolite (e.g. zeolite beta) to an inner core material (e.g. cordierite). The use of an organic bonding agent in the catalyst preparation procedure provides a composition that is sufficiently resistant to mechanical attrition to be used commercially in aromatic alkylation processes (e.g. benzene alkylation to ethylbenzene). Advantages associated with the use of layered compositions include a significant reduction in the amount of zeolite used for a given reactor loading and improved selectivity to desired alkylated aromatic products. Further benefits are realized when the layered composition is formed into shapes having a sufficiently high void volume to reduce pressure drop across the alkylation catalyst bed. This is especially relevant for operation involving high recycle rates and consequently low alkylating agent concentrations in the reaction zone. Such conditions are known to promote reduced byproduct formation.

    摘要翻译: 公开了一种分层催化剂组合物,其中通过将包含结合的沸石(例如β沸石)的外层粘合到内芯材料(例如堇青石)来制备组合物。 在催化剂制备方法中使用有机粘合剂提供了足够耐机械磨损的组合物,其可以在芳族烷基化方法(例如苯烷基化至乙苯)中商业使用。 与使用分层组合物相关的优点包括用于给定反应器负载的沸石的量的显着减少和对所需烷基化芳族产物的改进的选择性。 当层状组合物形成为具有足够高的空隙体积的形状以减少跨越烷基化催化剂床的压降时,可实现进一步的益处。 这对于涉及高回收率和因此反应区中低烷基化剂浓度的操作特别有用。 已知这种条件促进副产物形成。

    Silicon substituted EMC-2 zeolite: LZ-281
    40.
    发明授权
    Silicon substituted EMC-2 zeolite: LZ-281 有权
    硅取代的EMC-2沸石:LZ-281

    公开(公告)号:US06200463B1

    公开(公告)日:2001-03-13

    申请号:US09366513

    申请日:1999-08-03

    IPC分类号: B01J2906

    摘要: Applicants have prepared a novel zeolite identified as LZ-281. This zeolite has the framework topology of zeolite EMT. The LZ-281 zeolite is prepared by removing framework aluminum atoms from EMC-2 zeolite while simultaneously replacing the aluminum atoms with extraneous silicon atoms. This increases the SiO2/Al2O3 ratio versus the starting EMC-2 zeolite and results in the LZ-281 zeolite having increased thermal stability, increased number and/or strength of acid sites and increased activity in hydrocarbon processes requiring strong acid sites.

    摘要翻译: 申请人已经制备了一种鉴定为LZ-281的新型沸石。 该沸石具有沸石EMT的骨架拓扑结构。 通过从EMC-2沸石中除去骨架铝原子同时用外来硅原子代替铝原子来制备LZ-281沸石。 这相对于起始的EMC-2沸石增加了SiO 2 / Al 2 O 3比例,并且导致LZ-281沸石具有增加的热稳定性,增加的酸位数和/或强度以及在需要强酸性位点的烃法中增加的活性。