Highly effective perovskite-type BaZrO3 supported Ru catalyst for ammonia synthesis
Highly effective perovskite-type BaZrO3 supported Ru catalyst for ammonia synthesis
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DOI：
10.1016/j.apcata.2013.03.037
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发表时间：
2013-05
影响因子：
5.5
通讯作者：
Ziqing Wang;Ben Liu;Jianxin Lin
中科院分区：
文献类型：
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作者：
Ziqing Wang;Ben Liu;Jianxin Lin
以钙钛矿型BaZrO 3为载体制备了钌基催化剂。通过对催化剂的物化性质进行表征，揭示了催化剂结构与催化性能之间的关系。结果表明，在673 K、3.0MPa下，Ru/BaZrO_3催化剂的出水中氨浓度为6.36%，远高于其它载体（包括炭材料体系）负载的Ru催化剂在相同条件下的出水中氨浓度，且反应120 h后，反应速率没有下降。这可能是由于Ru粒子的最佳尺寸具有更多的B5型位，BaZrO 3载体的强供电子能力以及强的金属-载体相互作用为电子转移提供了有效的通道。另一方面，H2在该催化剂表面的吸附被抑制，用于活化N2的活性中心的数目也增加。
The ammonia synthesis was performed over Ru catalyst supported on perovskite-type BaZrO3. Physiochemical properties of this catalyst were also characterized by means of various techniques to show the relationships between catalyst structure and catalytic performance. It was found that the ammonia concentration in the effluent of Ru/BaZrO3catalyst was 6.36% at 673K under 3.0MPa, which was much higher than that of Ru catalyst supported on other supports including carbon material systems under the similar conditions, and the rate did not decrease even if the reaction was executed for 120h. This might be attributed to the facts that the optimum size of Ru particles has more B5-type sites, strong electron-donating ability of the BaZrO3support and the strong metal–support interaction provides an efficient channel for electron transfer. On the other hand, the adsorption of H2was inhibited over the surface of this catalyst and the number of active sites for the activation of N2was also increased.