(DE19535402-A1)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.    (JP9141097-A)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.    (US5847250-A)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.    (US5856262-A)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.    (TW388722-A)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.    (CN1151908-A)      Supported catalyst (I), suitable for selective hydrogenation of C2H2 in hydrocarbon streams, is based on SiO2 and contains 0.001-1 wt.% Pd and 0.005-5 wt.% gp. I and/or II metal(s) as promoter. It is obtd. by impregnating a SiO2 support with a soln. contg. the promoter metal(s), drying, impregnating with a soln. contg. Pd, drying and calcining. Also claimed is a method of preparing (I).    USE -   (I) is used for catalytic hydrogenation of C2H2 in hydrocarbon streams, esp. in the presence of C2H4, and in a process for selective hydrogenation of C2H2 in the gas phase, esp. in a stream of C2H4 and C2H6 contg. 0.01-5 vol.% C2H2 (all claimed). It is esp. useful for hydrogenating C2H2 in streams from steam crackers, which contain mainly C2H4 and C2H6 with 0.01-5 vol.% C2H2 and are used in the mfr. of polyethylene.    ADVANTAGE -   Even small amts. of C2H2 in hydrocarbon streams are hydrogenated with high selectivity, without addn. of CO.