Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene
Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene
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DOI：
10.1007/s10562-007-9371-7
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发表时间：
2008-05
影响因子：
2.8
通讯作者：
Howon Lee;J. Jung;Heesoo Kim;Youngmin Chung;Tae Jin Kim;S. Lee;Seung-Hoon Oh;Yong Seung Kim
中科院分区：
文献类型：
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作者：
Howon Lee;J. Jung;Heesoo Kim;Youngmin Chung;Tae Jin Kim;S. Lee;Seung-Hoon Oh;Yong Seung Kim
用共沉淀法在不同pH(pH=6−12)的缓冲溶液中制备了铁酸锌催化剂，并将其用于丁烯氧化脱氢制1，3-丁二烯。丁烯转化率和1，3-丁二烯的产率与共沉淀过程中的pH值呈火山型曲线。通过NH3-TPD实验考察了铁酸锌催化剂的酸性与催化性能之间的关系。结果表明，铁酸锌催化剂在丁烯氧化脱氢反应中的催化性能与催化剂的表面酸性密切相关。丁烯转化率和1，3-丁二烯收率随催化剂表面酸性的增加而增加。在所考察的催化剂中，当pH=0.08时制备的铁酸锌催化剂对丁烯氧化脱氢反应表现出最好的催化性能，这归因于其最大的表面酸性。
Zinc ferrite (ZnFe2O4) catalysts were prepared by a co-precipitation method using aqueous buffer solution with different pH (pH = 6−12), and applied to the oxidative dehydrogenation ofn-butene to 1,3-butadiene. Conversion ofn-butene and yield for 1,3-butadiene showed volcano-shaped curves with respect to pH value employed during the co-precipitation step. 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 of zinc ferrite catalysts in the oxidative dehydrogenation ofn-butene was closely related to the surface acidity of the catalysts. Conversion ofn-butene and yield for 1,3-butadiene increased with increasing surface acidity of the catalysts. Among the catalysts tested, the zinc ferrite catalyst prepared at pH = 8 showed the best catalytic performance in the oxidative dehydrogenation ofn-butene, which was attributed to its largest surface acidity.