In the present study, NiO modified ZnAl2O4 and ZnO modified NiAl2O4 spinel along with pure Al2O3, ZnAl2O4 and NiAl2O4 for comparison in the CO2 hydrogenation reaction have been investigated. It was found that NiAl2O4, NiO/ZnAl2O4 and ZnO/NiAl2O4 catalysts exhibited outstanding activity and selectivity towards methane even at high temperature compared to similar spinel structures reported in the literature. NiO/ZnAl2O4 catalyst showed CO2 consumption rate of ~ 19 μmol/g·s at 600 °C and ~ 85% as well as ~ 50% of methane selectivity at 450 °C and 600 °C, respectively. The high activity and selectivity of methane can be attributed to the presence of metallic Ni and Ni/NiO/ZnAl2O4 interface under the reaction conditions as evidenced by the XRD results. High performance Ni–Zn–Al-based oxide/spinel nanostructures is synthesized and NiO/ZnAl2O4 catalyst exhibited higher catalytic activity in the CO2 hydrogenation reaction due to the presence of metal support interaction between Ni and ZnAl2O4 support.

中文翻译：

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用于高性能甲烷选择性 CO2 加氢反应的 Ni-Zn-Al 基氧化物/尖晶石纳米结构

在本研究中，研究了 NiO 改性 ZnAl2O4 和 ZnO 改性 NiAl2O4 尖晶石以及纯 Al2O3、ZnAl2O4 和 NiAl2O4，以便在 CO2 加氢反应中进行比较。结果表明，与文献报道的类似尖晶石结构相比，NiAl2O4、NiO/ZnAl2O4 和 ZnO/NiAl2O4 催化剂即使在高温下也表现出出色的甲烷活性和选择性。NiO/ZnAl2O4 催化剂在 600 °C 下的 CO2 消耗率为 ~ 19 μmol/g·s，在 450 °C 和 600 °C 下分别为 ~ 85% 和 ~ 50% 的甲烷选择性。甲烷的高活性和选择性可归因于在反应条件下金属 Ni 和 Ni/NiO/ZnAl2O4 界面的存在，XRD 结果证明。