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首页> 外文期刊>Catalysis science & technology >Direct dehydrogenation of isobutane to isobutene over Zn-doped ZrO2 metal oxide heterogeneous catalysts
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Direct dehydrogenation of isobutane to isobutene over Zn-doped ZrO2 metal oxide heterogeneous catalysts

机译：直接脱氢异丁烯异丁烷在Zn-doped锆金属氧化物的异构催化剂

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摘要

A number of excellent reviews have reported that the surface acid-base properties of catalysts play an important role in the dehydrogenation of light alkanes. Moreover, doping of metal oxides can modify their intrinsic properties. Herein, the synthesis of unconventional binary doped oxide heterogeneous catalysts (ZnZrO-x) was described and their respective isobutane dehydrogenation performances were evaluated. The detection results of a range of instrumental analysis techniques revealed that all ZnZrO-x samples comprise nanosized aggregates. CO2/NH3-TPD and Py-IR analyses showed that the incorporation of Zn partially neutralizes inherent strong Lewis acid-base pairs and reduces the surface acidity of ZrO2. XRD, XPS and EPR characterization and activity test results confirmed that coordinatively unsaturated Zr4+ ions (Zr-cus(4+)) near oxygen vacancies (V-O(center dot center dot)) act as active sites for isobutane dehydrogenation. In addition, the possible reaction pathways and formation of the above active sites were discussed in detail. Among the investigated catalysts, ZnZrO-5 demonstrates the highest dehydrogenation activity and stability, achieving an isobutane conversion of 32.5% with an isobutene selectivity of 94.6% after 7 h time-on-stream.
机译：有报道称,许多优秀的评论催化剂的表面酸碱性质脱氢的扮演着重要的角色轻烷烃。可以修改他们的内在属性。非常规的合成二进制掺杂氧化异构催化剂(ZnZrO-x)描述和各自的异丁烷脱氢性能进行评估。一系列仪器的检测结果分析技术显示,所有ZnZrO-x样品组成纳米尺度的总量。二氧化碳/ NH3-TPD和Py-IR分析表明将锌部分中和固有的强路易斯酸碱双和减少锆的表面酸性。特征和活动测试结果证实,协调不饱和Zr4 +氧离子(Zr-cus(4 +))附近的空缺(V-O(中心导中心导))作为活跃的网站异丁烷脱氢。可能的反应途径和形成的以上活动网站详细讨论。在研究催化剂,ZnZrO-5表明脱氢活性最高与稳定,实现了异丁烷转换32.5%的异丁烯选择性94.6%7 h time-on-stream之后。

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