The metastable Ni/ZrO catalysts were rationally constructed via reflux treatment and employed for dry reforming of methane. Reflux could suppress the transformation and improve the stability of the metastable ZrO, as well as enrich its pore structure. Meanwhile, acidity-basicity, Zr and oxygen vacancies were also promoted. Additionally, Ni dispersion was remarkably improved with increasing reflux time due to the abundant pores and enhanced metal-support interaction. These results illustrated the evaluation that prolonging reflux time could significantly proliferate the performance of Ni/ZrO. Besides, reflux could strengthen the anti-carbon ability but the widened gap between CH dissociation and CO activation would cause more carbon deposition. The catalyst with reflux for 240 h showed the robust stability for 9000 min (CH conversion: 80 %; CO conversion: 88 %) at 750 °C. Furthermore, the mechanisms were discussed to unravel the origin of the accelerated performance by reflux and provide some references for designing efficient Ni-based catalyst.

中文翻译：

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合理构建亚稳态ZrO2负载Ni催化剂用于高效稳定的甲烷干重整


通过回流处理合理构建了亚稳态Ni/ZrO催化剂，并将其用于甲烷干重整。回流可以抑制相变，提高亚稳态ZrO的稳定性，丰富其孔结构。同时，酸碱度、Zr和氧空位也得到促进。此外，由于丰富的孔隙和增强的金属-载体相互作用，随着回流时间的增加，镍的分散性得到显着改善。这些结果说明延长回流时间可以显着提高 Ni/ZrO 的性能。此外，回流可以增强抗碳能力，但CH解离和CO活化之间的差距扩大会导致更多的碳沉积。催化剂回流240小时，在750℃下9000分钟表现出良好的稳定性（CH转化率：80%；CO转化率：88%）。此外，还讨论了其机理，以揭示回流加速性能的根源，为设计高效的镍基催化剂提供一些参考。