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    • 4. 发明授权
    • Process for preparing silver catalyst
    • 制备银催化剂的方法
    • US06184175B2
    • 2001-02-06
    • US08195096
    • 1994-02-14
    • Nabil Rizkalla
    • Nabil Rizkalla
    • B01J2350
    • B01J23/50B01J23/66B01J35/1009B01J35/1038B01J35/1076B01J37/0203B01J37/0205B01J37/086C07D301/10
    • An improved silver catalyst for the oxidation of ethylene with molecular oxygen is made by impregnating a porous support with a silver salt of an acid; subjecting the impregnated support to a multi-stage activation in an atmosphere containing less oxygen than air by heating at a first temperature in the range of 150 to 200° C. for less than an hour, heating at a second temperature in the range of from greater than 200° C. to 300° C. for less than one hour, heating at a third temperature in the range of from greater than 300° C. to 400° C. for less than one hour and finally heating at a fourth temperature in the range of from greater than 400° C. to 500° C.; and post impregnating the support with an alkali metal, preferably cesium, from an anhydrous alcohol solution followed by washing with alcohol solvent and rapid drying to produce a finished catalyst having from 1-6×10−3 gew of the alkali metal per kg of catalyst.
    • 通过用酸的银盐浸渍多孔载体来制备用于用分子氧氧化乙烯的改进的银催化剂; 在150-200℃的第一温度下加热至少于1小时的第二温度,在含氧量比空气少的气氛中进行多级活化,在第二温度范围内加热 大于200℃至300℃,持续时间小于1小时,在大于300℃至400℃的第三温度下加热少于1小时,最后在第四温度下加热 在大于400℃至500℃的范围内。 并用碱金属(优选铯)从无水醇溶液中浸渍载体,然后用醇溶剂洗涤并快速干燥,得到每千克催化剂具有1-6×10 -3 gew碱金属的成品催化剂。