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題名 | A Study on the Selective Hydrogenation of 1,3-Butadiene over Pd-Li/SiO[feaf] Catalysts |
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作者 | Kang,Min; Song,Min Woo; Kim,Jae Hyung; Lee,Chang Ha; Kim,Kyung Lim; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 31:3 2000.05[民89.05] |
頁次 | 頁261-268 |
分類號 | 468.8 |
關鍵詞 | 選擇性氫化反應; 觸煤; 丁烯; Selective hydrogenation; 1-Butene selectivity; Pd; Alkali metal; XPS; |
語文 | 英文(English) |
英文摘要 | Lithium addition to Pd supported on silica markedly improves the 1-butene selectivity and activity for hydrogenation of 1,3-butadiene without isomerization and over-hydrogenation of the 1-butene. The activity of 1,3-butadiene in hydrogenation increased linearly with lithium loading. This behavior indicates that there is not a physical blockage of the surface active sites. These results are in good agreement with XPS results that the addition of lithium aidled Pd particles to be the metallic state as active site. The addition of lithium greatly improves 1-butene selectivity till a certain level, but over which it decreased and trsn-2-butene increased due to isomerization. The ration of trans- and cis-2-butne from the result of hydrogenation of 1-butene was about 2:1, i.e., 1-butene favored the trans isomer. Therefore, it was reasonably assumed that the increase in 10butene favored the trans isomer. Therefore, it was reasonably assumed that the increase in 1-butene selectivity was reflected in an decrease in the trans-2-butene selectivity. From N□-TPD it is suggested that the addition of lithium affects the adsorption of reactant and product and consequently 1-butene selectivity. 1-Butene selectivity results also indicated there is an optimum value creating a better environment for the desorption of 1-butene without isomerization at a certain level of the lithium loading. |
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