Abstract The CO2 methanation is an important process in coal-to-gas, power-to-gas and CO2 removal for spacecraft. Recently, metal-organic framework (MOF) derivatives have been demonstrated as high-performance catalysts for CO2 upgrading processes. However, due to the high costs and low stability of MOF derivatives, it still remains challenge for the development of alternative synthesis methods avoiding MOF precursors. In this work, we present the sol-gel method for loading Ni-MOF to silica support in two-steps. Upon modifying the procedure, a more simplified one-step sol-gel method has been developed. Furthermore, the obtained Ni/SiO2 catalyst still exhibits great catalytic performance with a CO2 conversion of 77.2% and considerable CH4 selectivity of ~100% during a stability test for 52 h under a low temperature of 310 °C and high GHSV of 20,000 mL·g−1·h−1. Therefore, this work provides a ground-breaking direct strategy for loading MOF derived catalysts, and might shed a light on the preparation of highly dispersed Ni/SiO2 catalyst.

中文翻译：

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用于增强 CO2 甲烷化的工程 Ni/SiO2 催化剂

摘要 CO2甲烷化是航天器煤制气、电制气和CO2脱除的重要过程。最近，金属有机骨架 (MOF) 衍生物已被证明是 CO2 提纯过程的高性能催化剂。然而，由于 MOF 衍生物的高成本和低稳定性，开发避免 MOF 前体的替代合成方法仍然存在挑战。在这项工作中，我们提出了分两步将 Ni-MOF 加载到二氧化硅载体上的溶胶-凝胶方法。在修改程序后，开发了一种更简化的一步溶胶-凝胶方法。此外，在 310°C 的低温和 20 的高 GHSV 条件下进行 52 小时的稳定性测试时，所获得的 Ni/SiO2 催化剂仍然表现出良好的催化性能，CO2 转化率为 77.2%，CH4 选择性高达~100%，000 mL·g-1·h-1。因此，这项工作为负载 MOF 衍生催化剂提供了突破性的直接策略，并可能为高度分散的 Ni/SiO2 催化剂的制备提供启示。