Effect of pH in the preparation of ZnFe2O4 for oxidative dehydrogenation of n-butene to 1,3-butadiene:: Correlation between catalytic performance and surface acidity of ZnFe2O4
Effect of pH in the preparation of ZnFe2O4 for oxidative dehydrogenation of n-butene to 1,3-butadiene:: Correlation between catalytic performance and surface acidity of ZnFe2O4
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DOI：
10.1016/j.catcom.2007.10.023
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发表时间：
2008-03-31
影响因子：
3.7
通讯作者：
Song, In Kyu
中科院分区：
文献类型：
--
作者：
Lee, Howon;Jung, Ji Chul;Song, In Kyu
采用共沉淀法制备了一系列铁酸锌（ZnFe 2 O 4）催化剂，并将其应用于正丁烯氧化脱氢制1，3-丁二烯反应中。发现在pH 6-12下形成铁酸锌相。在低pH值（pH 6-10）下，正丁烯转化率、1，3-丁二烯选择性和1，3-丁二烯收率都很高，但随着pH值的升高（pH 11-12），转化率和1，3-丁二烯收率急剧下降。通过NH3-TPD实验研究了铁酸锌催化剂的酸性与催化性能的关系。结果表明，催化剂的催化性能与催化剂的表面酸性密切相关。随着催化剂表面酸性的增加，正丁烯转化率增加。在所测试的催化剂中，具有最大表面酸性的pH 9制备的铁酸锌催化剂在正丁烯氧化脱氢中表现出最好的催化性能。(C)2007 Elsevier B. V.保留所有权利。
A series of zinc ferrite (ZnFe2O4) catalysts were prepared by a co-precipitation method with a variation of pH value (pH 3-12), and applied to the oxidative dehydrogenation of n-butene to 1,3-butadiene. It was found that a zinc ferrite phase was formed at pH 6-12. Conversion of n-butene, selectivity for 1,3-butadiene, and yield for 1,3-butadiene were very high at low pH value (pH 6-10), but were drastically decreased with increasing pH value (pH 11-12). NH3-TPD experiments were conducted to correlate the acid property with the catalytic performance of zinc ferrite catalysts. It was revealed that the catalytic performance was closely related to the surface acidity of the catalysts. Conversion of n-butene was increased with increasing surface acidity of the catalysts. Among the catalysts tested, the zinc ferrite catalyst prepared at pH 9 with the largest surface acidity showed the best catalytic performance in the oxidative dehydrogenation of n-butene. (C) 2007 Elsevier B.V. All rights reserved.