| 摘要 |
PURPOSE:To develop a catalyst for selctive hydrogenation of an acetylene compd. which is an impurity in olefin by impregnating the salt of other specific metals as an aq. soln. in a carrier deposited thereon with metallic Pd and drying the same then reducing the salt. CONSTITUTION:An aq. soln. of the chloride, nitrate, acetate or the like of Pd is impregnated in an alumina carrier as a catalyst to be used in the stage of removing an acetylene compd. which is an impurity contained in the fraction obtained by cracking or the like of petroleums and consisting essentially of olefin hydrocarbon contg. 3-4 carbon atoms by selective hydrogenation. Such soln. is reduced to metallic Pd with a reducing agent such as hydrazine, formaldehyde or the like, whereafter one kind of inorg. acid salt, org. acid salt or oxide of Cu, Au, Ag, Sn, Zn, Pb, Cd, etc. is deposited on the carrier. The carrier is heated in air or an inert gas and is further reduced in gaseous hydrogen flow, whereby the catalyst consisting essentially of Pd and consisting of the other metal as a promoter is obtd. |
