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11. 发明授权

US06355596B2 Method for preparing titanium on silica catalysts with controlled distributions 有权
标题翻译：在具有受控分布的二氧化硅催化剂上制备钛的方法
公开(公告)号：US06355596B2
公开(公告)日：2002-03-12
申请号：US09323731
申请日：1999-06-01
申请人： Yatao Hu , Anthony L. Dent
发明人： Yatao Hu , Anthony L. Dent
IPC分类号： B01J2106
CPC分类号： B01J21/063 , B01J21/08 , B01J35/008 , B01J37/0203 , B01J37/036
摘要： A method for preparing a titanium on silica catalyst, in the form of formed particles such as macrospheres, achieves a controlled titanium distribution type, namely either uniform, eggshell, or intermediate, by selecting the particular titanium precursor depending on its reactivity with hydroxyl groups and by selecting the molar titanium:hydroxyl ratio. Selecting a titanium precursor with a low reactivity and/or adding sufficient titanium precursor to achieve a high molar titanium:hydroxyl ratio aids in forming a uniform distribution of titanium. On the other hand, selecting a titanium precursor with a high reactivity and/or adding only a little titanium precursor resulting in a low molar titanium:hydroxyl ratio aids in forming an eggshell distribution of titanium. Preferred titanium precursors for aiding in the formation of an eggshell distribution of titanium include n-propyl titanate and n-butyl titanate, and preferred titanium precursors for aiding in the formation of a uniform distribution of titanium include titanocene and titanium acetylacetonate. Such silica on titanium catalysts can be used to make epoxidation catalysts, oxidation catalysts, hydroxylation catalysts, and the preferred distribution type depends on the particular application.
摘要翻译：以二氧化硅催化剂制备钛的方法，其形成颗粒如大球，通过根据其与羟基的反应性选择特定的钛前体，得到受控的钛分布型，即均匀的，蛋壳或中间体，通过选择钛：羟基摩尔比。选择具有低反应性的钛前体和/或添加足够的钛前体以实现高摩尔钛：羟基比有助于形成钛的均匀分布。另一方面，选择具有高反应性的钛前体和/或仅添加少量钛前体，导致低摩尔钛：羟基比有助于形成钛的蛋壳分布。有助于形成钛壳蛋白分布的优选钛前体包括钛酸正丙酯和钛酸正丁酯，并且有助于形成均匀分布钛的优选钛前体包括二茂钛和乙酰丙酮钛。钛催化剂上的这种二氧化硅可用于制备环氧化催化剂，氧化催化剂，羟基化催化剂，优选的分布类型取决于具体应用。

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