Abstract: A selective hydrogenation catalyst for pyrolysis gasoline. The catalyst mainly consists of a support of &dgr;, &agr; mixed alumina covered by palladium and alkali metal and/or alkaline-earth metal which are distributed on the support surface, and the support has 0.5 to 09. ml/g of specific pore volume. 40 to 200 Å pores account for more than 85% of the total pore volume. The specific surface area is 70 to 140 m2/g, and &agr; crystal structure in the alumina support is 0.5 to 5% based on the weight percentage of &dgr;, &agr; mixed alumina support. The catalyst includes palladium in amount of 0.05 to 0.4 wt %, alkali metal and/or alkaline-earth metal in amount of 0.05 to 2.0 wt %.

Abstract: The present invention is related to a selective hydrogenation catalyst for pyrolysis gasoline, wherein the catalyst mainly consists of a support of &dgr;, &agr; 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 &dgr;, &agr; 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.