| 摘要 |
The present invention is related to a selective hydrogenation catalyst for pyrolysis gasoline, wherein the catalyst mainly consists of a support of delta, alpha mixed alumina covered by palladium as active component, promoter as co-active component and alkali metal and/or alkaline-earth metal. Said palladium is distributed like egg shell on the support surface. Said support has 0.5~0.9 ml/g of specific pore volume, wherein 40~200 Å pores account for more than 85% of the total pore volume, preferably 100~200 Å pore volume accounts for 65%~80% of the said total pore volume in catalyst support. The specific surface area is about 70~140 m2/g , and a crystal type in the alumina support is about 0.1~5% based on the weight percentage of delta, alpha mixed alumina support, said catalyst contains promoter having selected from a group of the VIB or IB elements in the periodical table of elements. The ratio of promoter and palladium by weight is about 0.2~2:1. The alkali metal and/or alkaline-earth metal is added in amount of 0.05~2.0 wt %.
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