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    • 3. 发明申请
    • Process for producing synthetic zeolites with MFI structure
    • 用MFI结构生产合成沸石的方法
    • US20060029542A1
    • 2006-02-09
    • US11224841
    • 2005-09-13
    • Gotz BurgfelsJosef SchonlinnerFriedrich Schmidt
    • Gotz BurgfelsJosef SchonlinnerFriedrich Schmidt
    • C01B39/00
    • C01B39/40B01J29/40B01J35/002B01J35/023B01J35/1019B01J35/1038B01J35/108C07C5/2737C07C2529/40Y02P20/52Y10S423/22C07C15/08
    • A process is described for producing synthetic zeolites useful as catalysts with a MFI structure, a Si/Al atomic ratio from about 8 to 45 to 1 and very small primary crystallites. A Si source, an Al source and an organic template are reacted with one another under hydrothermal conditions. The process is carried out in the presence of seed crystals with an average particle size from roughly 10 to 100 nm, preferably from 20 to 50 nm, prepared from an earlier batch of synthetic zeolites with a MFI structure, without separation from the mother liquor. The process further includes conversion by ion exchange of the zeolites into an H form. Moldings may also be produced by the addition of binders and optionally catalytically active base metal and/or precious metal components before or after the moldings are produced. The zeolites as claimed in the invention are characterized by the combination of the following features: (a) Si/Al atomic ratio 8 to 45:1 (b) Size of the primary crystallites roughly 0.01 to 0.05 microns; (c) Ratio between longest and shortest axis of the primary crystallites: roughly 1.0 to 1.5:1; (d) Ratio between the intensity of the x-ray diffraction line with the highest intensity (Dmax=3.865±0.015) and the intensity of the x-ray diffraction lines of ZSM 11-zeolite (Dmax=11.15 angstroms); mordenite (Dmax=9.06 angstroms); α-cristobalite (Dmax=3.345 angstroms); and analcim (Dmax=4.83 angstroms)>500:1.
    • 描述了用于制备可用作具有MFI结构的催化剂,约8至45比1的Si / Al原子比和非常小的初级晶体的合成沸石的方法。 Si源,Al源和有机模板在水热条件下彼此反应。 该方法在存在从具有MFI结构的较早批次的合成沸石制备而不与母液分离的平均粒度为约10至100nm,优选20至50nm的晶种的情况下进行。 该方法还包括通过沸石离子交换成H形式的转化。 模制品也可以通过在制造模制品之前或之后添加粘合剂和任选的催化活性的贱金属和/或贵金属组分来生产。 本发明所述的沸石的特征在于以下特征的组合:(a)Si / Al原子比为8至45:1(b)初级微晶的尺寸大约为0.01至0.05微米; (c)主晶体的最长和最短轴之间的比率:大约1.0至1.5:1; (d)具有最高强度(D max max = 3.865±0.015)的x射线衍射线的强度与ZSM 11-沸石(D)的x射线衍射线的强度之比 最大 = 11.15埃); 丝光沸石(D max max = 9.06埃); α-方英石(D max max = 3.345埃); 和Analcim(D max max = 4.83埃)> 500:1。