Abstract A series of Ni-Zn-Mg-Al hydrotalcite-derived catalysts with different divalent to trivalent metal (MII/MIII) ratio (2.0, 2.5, 3.0 and 3.5) and different Ni loading (1.25, 2.5, 5, 10 and 15 wt%) were prepared, characterized and tested for tri-reforming of methane (TRM). TRM was carried out at 800 °C, 1 atm, 49,200 mLh−1 g−1 space velocity and molar feed composition CH4:CO2:H2O:O2:N2 = 1:0.23:0.46:0.07:0.28. Higher Ni metal dispersion was achieved at lower MII/MIII ratio. However, increase in MII/MIII ratio enhanced basic site concentration and basic site strength. The trade-off between Ni dispersion and basic properties resulted in higher activity of catalyst having MII/MIII ratio of 3.0. The catalysts with 1.25 and 2.5 wt% and 15 wt% Ni loading underwent deactivation in 20 h run due to metal sintering and carbon deposition respectively. The catalysts with 5 wt% and 10 wt% Ni loading showed good stability. Finally, a 80 h long run demonstrated outstanding activity and remarkable stability of Ni-Zn-Mg-Al catalyst having MII/MIII ratio 3.0 and 5 wt% Ni loading for TRM.

中文翻译：

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用于甲烷三重重整的水滑石衍生的 Ni-Zn-Mg-Al 催化剂：二价与三价金属比和 Ni 负载量的影响

摘要 一系列具有不同二价与三价金属 (MII/MIII) 比（2.0、2.5、3.0 和 3.5）和不同 Ni 负载量（1.25、2.5、5、10 和 15）的 Ni-Zn-Mg-Al 水滑石衍生催化剂wt%) 被制备、表征和测试用于甲烷的三重重整 (TRM)。TRM 在 800 °C、1 atm、49,200 mLh-1 g-1 空速和摩尔进料组成 CH4:CO2:H2O:O2:N2 = 1:0.23:0.46:0.07:0.28 下进行。在较低的 MII/MIII 比率下实现了较高的 Ni 金属分散度。然而，MII/MIII 比率的增加增强了碱性位点浓度和碱性位点强度。Ni 分散性和基本性质之间的权衡导致 MII/MIII 比为 3.0 的催化剂具有更高的活性。由于金属烧结和碳沉积，分别为 1.25 和 2.5 重量％和 15 重量％镍负载的催化剂在 20 小时运行中经历了失活。Ni负载量为5wt%和10wt%的催化剂表现出良好的稳定性。最后，80 小时的长期运行证明了具有 MII/MIII 比率 3.0 和 5wt% Ni 负载量的 Ni-Zn-Mg-Al 催化剂的出色活性和显着稳定性，用于 TRM。