关键词: 钯银催化剂, 1-丁烯, 丁二烯, 选择加氢, 异构化

Abstract: Selective hydrogenation of butadiene in C4 mixture to produce 1-butene on Pd-Ag/Al2O3 catalyst was studied. The test results showed that selectivity of 1-butene produced from 1,3-butadiene hydrogenation was closely related to both inlet 1,3-butadiene concentration and H2/butadiene mole ratio. Under the conditions of inlet temperature 40 ℃，pressure 1.0 MPa，liquid space velocity 40h?1，when inlet butadiene concentration was more than 2.6%，selectivity of 1-butene maintained at more than 66%；when inlet butadiene concentration was less than 2.6%，selectivity of 1-butene began to decline as isomerization reaction was intensified. When inlet butadiene concentration was less than 1.0%，outlet 1,3-butadiene concentration could be reduced to less than 1.0×10-5. With the increase of H2/butadiene mole ratio，1-butene selectivity declined linearly when inlet butadiene concentration was between 0.50% and 0.85%，indicating that excess H2 with respect to butadiene was an important reason for isomerization and hydrogenation reactions of butene. H2-TPR and XPS results showed that Pd-Ag alloy was formed during catalyst reduction.

Key words: Pd-Ag catalyst, 1-butene, butadiene, selective hydrogenation, isomerization