NOVELTY - A selective hydrogenation catalyst comprises: (1) an inorganic oxide; (2) a major active palladium (Pd) component (0.002-1.0%) based on total weight of the catalyst; and (3) promoter(s) comprising group IB metal.    USE - For selective hydrogenation of alkynes and dienes and in the selective hydrogenation of C2, C3 or C2 and C3 mixed feed containing any contents of hydrogen and CO (all claimed).    ADVANTAGE - The hydrogenation catalyst has low yield of green oil, long service lifetime, high activity and selectivity. Catalytic performance of the catalyst is not affected by the variation in the concentration of carbon monoxide and hydrogen. The catalyst effectively converts mixed components containing alkynes and dienes into corresponding monoolefins.    DETAILED DESCRIPTION - A selective hydrogenation catalyst comprises:    (1) an inorganic oxide comprising alumina, titania, or a chemical composite of alumina and titania;    (2) a major active palladium (Pd) component (0.002-1.0%) based on the total weight of the catalyst; and    (3) promoter(s) comprising group IB metal.    The mole ratio of Pd to the group IB metal is 1-20. The major Pd component and the promoter are uniformly distributed together in the catalyst structure within a thickness between the support surface and the depth of more than 300 mum.    INDEPENDENT CLAIMS are included for the following:    (1) Process for catalyst preparation comprising:    (i) preparing the inorganic support;    (ii) impregnating the active component; and    (iii) decomposing the catalyst; and    (2) Process for preparation of chemical composite support of alumina and titania, comprising:    (i) dissolving MAlO2 (M is Na, K or Li) and titanium salts in water at about 20-80degreesC;    (ii) neutralizing the mixture with MOH solution to form a co-precipitate of aluminum-titanium hydroxide, which is stirred for about 10-30 hours to form uniform crystal particles;    (iii) filtering to wash away M+ and acid radical negative ions;    (iv) drying the derived aluminum-titanium hydroxide at about 100-150degreesC; and    (v) pulverizing, kneading and calcining the solid sample at about 800-1100degreesC to obtain the chemical composite support.    DESCRIPTION OF DRAWING(S) - The figure shows the relation of the activity and selectivity of the hydrogenation catalyst with time on stream (TOS).