Investigation on Deactivation of K‐promoted Ru Catalyst for Ammonia Synthesis by CO Formation,ChemistrySelect

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Investigation on Deactivation of K‐promoted Ru Catalyst for Ammonia Synthesis by CO Formation
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-06-09 , DOI: 10.1002/slct.202000772
Jun Ni ₁ , Haiyun Ran ₁ , Jianxin Lin ₁ , Xiuyun Wang ₁ , Bingyu Lin ₁ , Lilong Jiang ₁

Affiliation

The prevailing view of the deactivation of carbon‐supported Ru catalyst in ammonia synthesis is carbon methanation, but those strategies focusing on inhibiting carbon methanation cannot effectively solve the challenge of Ru/C catalysts. Herein we prepared four K‐promoted Ru catalysts with different Ru loadings and treated the samples at 450 or 500 °C under 1 MPa during ammonia synthesis reaction. The result showed that the presence of a larger amount of Ru species enhanced methane formation at the reaction temperature, which was irrelevant to the loss in activity of ammonia synthesis. On the contrary, CO formation along with a great decline in catalytic activity can be observed when Ru catalysts are heated at 500 °C. The characterization results indicated that the severe depletion of surface oxygen groups following the CO‐formation pathway, resulting in the notable decrease in the amount of gas adsorption, contributed to the deactivation of carbon‐supported Ru catalyst.

中文翻译：

一氧化碳形成失活钾合成钌催化剂失活氨的研究

氨合成中碳负载Ru催化剂失活的主要观点是碳甲烷化，但是那些专注于抑制碳甲烷化的策略不能有效解决Ru / C催化剂的挑战。本文中，我们制备了四种具有不同Ru负载量的K促进的Ru催化剂，并在氨合成反应过程中在1 MPa下于450或500°C下处理了样品。结果表明，大量Ru的存在促进了反应温度下甲烷的形成，这与氨合成活性的降低无关。相反，当Ru催化剂在500℃下加热时，可以观察到CO的形成以及催化活性的大大降低。表征结果表明，CO形成途径后表面氧基团严重耗竭，

更新日期：2020-06-09

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