Halide addition and distribution in the reactivation of platinum group catalysts
    1.
    发明授权
    Halide addition and distribution in the reactivation of platinum group catalysts 失效
    在铂族催化剂反应中的添加和分配

    公开(公告)号:US3637524A

    公开(公告)日:1972-01-25

    申请号:US3637524D

    申请日:1968-07-11

    CPC classification number: B01J23/96

    Abstract: There is disclosed a method for reactivating a fixed bed of used platinum group metal-alumina catalyst of the type in which the alumina is derived from hydrous alumina predominating in alumina trihydrate. Such catalysts are employed in, for instance, the catalytic reforming of gasoline boiling range hydrocarbons to obtain fuels of high-octane ratings or aromatics. The method for reactivating the catalyst which has declined in activity during use and contains carbonaceous deposits, involves treating the deactivated catalyst at elevated temperatures with an oxygencontaining gas to burn the carbonaceous deposits therefrom. The relatively carbon-free catalyst is contacted under controlled conditions with a gaseous stream containing small amounts of chlorine, in combined or elemental form, oxygen and often water vapor to deposit chloride in a first portion of the catalyst bed. After the chlorine component is added to the catalyst, preferably in a relatively short period of time, the catalyst is then contacted with a gaseous stream containing oxygen and water vapor. This treatment may continue for a longer time than the chlorine treating period and until the chloride deposited on the catalyst is distributed through a major portion of the catalyst bed. Distribution of the chloride is a function of the time, temperature and water vapor partial pressure observed during the treatment and thus the distribution is controlled essentially by kinetics. The extent of water contact with the catalyst is limited by controlling the amount of water in the gaseous streams and the length of the overall treatment.

    Abstract translation: 公开了一种使氧化铝从氧化铝三水合物中占优势的含水氧化铝衍生的二氧化钛类金属 - 氧化铝催化剂的固定床再活化的方法。 这种催化剂用于例如汽油沸程烃的催化重整以获得高辛烷值或芳族化合物的燃料。 在使用期间活性降低且含有碳质沉积物的催化剂再活化方法包括用含氧气体在升高的温度下处理失活的催化剂以从其中燃烧碳质沉积物。 相对无碳的催化剂在控制条件下与含有少量氯的气态物流,以组合或元素形式接触,氧气通常为水蒸汽,以在催化剂床的第一部分中沉积氯化物。 在将氯组分加入到催化剂中之后,优选在较短的时间内,然后使催化剂与含有氧和水蒸汽的气流接触。 该处理可持续比氯处理期更长的时间,并且直到沉积在催化剂上的氯化物分布在催化剂床的主要部分。 氯化物的分布是在处理期间观察到的时间,温度和水蒸气分压的函数,因此分布基本上由动力学控制。 与催化剂接触的水的程度通过控制气流中的水量和总体处理的长度来限制。

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