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Ammonia decomposition over Ni catalysts supported on perovskite-type oxides for the on-site generation of hydrogen

机译：钙钛矿型氧化物负载的Ni催化剂上的氨分解以现场产生氢气

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Ammonia decomposition has attracted increasing attention as a promising process for the on-site generation of hydrogen. In this study, Ni catalysts supported on perovskite-type oxides (ABO _(3) ) were prepared and the activity for ammonia decomposition was examined. The Ni/ANbO _(3) (A = Na and K) and Ni/AEMnO _(3) (AE = Ca, Sr, and Ba) catalysts were less effective for this reaction. Meanwhile, the Ni/REAlO _(3) (RE = La, Sm, and Gd) catalysts exhibited relatively high activity. For Ni/AETiO _(3) and Ni/AEZrO _(3) , the performance strongly depended on the A-site element of the perovskite-type oxides, and the Sr and Ba elements were more effective than the Ca one in the respective series. The catalytic activity for Ni/AEZrO _(3) was higher than Ni/AETiO _(3) in the case of the same alkaline earth element, and Ni/BaZrO _(3) was the most active among the samples investigated in this work. For these series, the order in the performance corresponded well with that in the basic property. The nitrogen desorption profiles revealed that the evolution of nitrogen atoms, which is one of the kinetically slow steps, effectively proceeded for Ni/SrZrO _(3) and Ni/BaZrO _(3) compared with the conventional Ni catalysts. This promotion effect would be ascribed to the strong basic properties of the SrZrO _(3) and BaZrO _(3) supports, resulting in the high activity of Ni/SrZrO _(3) and Ni/BaZrO _(3) for ammonia decomposition.
机译：氨分解作为一种现场产生氢气的有前途的方法已引起越来越多的关注。在这项研究中，制备了负载在钙钛矿型氧化物（ABO _（3））上的Ni催化剂，并研究了其氨分解活性。 Ni / ANbO_（3）（A = Na和K）和Ni / AEMnO_（3）（AE = Ca，Sr和Ba）催化剂对该反应的有效性较低。同时，Ni / REAlO_（3）（RE = La，Sm和Gd）催化剂表现出较高的活性。对于Ni / AETiO _（3）和Ni / AEZrO _（3）而言，性能强烈依赖于钙钛矿型氧化物的A-位元素，并且Sr和Ba元素分别比Ca元素更有效。系列。在相同碱土元素的情况下，Ni / AEZrO _（3）的催化活性高于Ni / AETiO _（3），并且在这项工作中，Ni / BaZrO _（3）的活性最高。 。对于这些系列，性能顺序与基本属性的顺序非常吻合。氮的解吸曲线表明，与常规的Ni催化剂相比，Ni / SrZrO _（3）和Ni / BaZrO _（3）是动力学上较慢的步骤之一，氮原子的释放有效地进行了。这种促进作用归因于SrZrO _（3）和BaZrO _（3）载体的强碱性，从而导致Ni / SrZrO _（3）和Ni / BaZrO _（3）具有很高的氨分解活性。 。

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