Abstract This study aims to investigate La2Zr2O7 pyrochlore-supported Ni nanocatalysts prepared by electrospinning and subsequent heat treatment. The solid solubility of Ni in La2Zr2O7 forms an interaction between NiO and La2Zr2O7 supports, which improves Ni dispersion and therefore increases catalytic activity during methane partial oxidation. The catalyst activity increased with Ni content up to 7 wt%. A further increase of the Ni content decreased the activity due to the limited solubility. The catalyst calcination temperature affected the interaction and hence the catalytic activity, and the optimal calcination temperature was 1000 °C. The Ni/La2Zr2O7 catalyst was compared with a conventional Ni/Al2O3 catalyst in term of the interaction. NiAl2O4 formation caused a strong interaction between Ni and Al2O3 supports, resulting in high reduction temperatures and low reducibility. In contrast, the limited solubility of Ni in La2Zr2O7 supports formed a more effective interaction, demonstrating the higher reducibility and catalytic performance. Therefore, an effective interaction between active catalyst and support is crucial to achieve high catalytic performance.

中文翻译：

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用于甲烷重整的纤维状 La2Zr2O7 烧绿石负载 Ni 纳米催化剂

摘要 本研究旨在研究通过静电纺丝和后续热处理制备的 La2Zr2O7 烧绿石负载 Ni 纳米催化剂。Ni 在 La2Zr2O7 中的固溶度在 NiO 和 La2Zr2O7 载体之间形成相互作用，这改善了 Ni 的分散性，从而提高了甲烷部分氧化过程中的催化活性。催化剂活性随着 Ni 含量增加到 7%（重量）而增加。由于有限的溶解度，Ni含量的进一步增加降低了活性。催化剂煅烧温度影响相互作用，从而影响催化活性，最佳煅烧温度为1000℃。Ni/La2Zr2O7 催化剂与传统的 Ni/Al2O3 催化剂在相互作用方面进行了比较。NiAl2O4 的形成引起 Ni 和 Al2O3 载体之间的强烈相互作用，导致高还原温度和低还原性。相比之下，Ni 在 La2Zr2O7 载体中有限的溶解度形成了更有效的相互作用，证明了更高的还原性和催化性能。因此，活性催化剂和载体之间的有效相互作用对于实现高催化性能至关重要。