Herein, a series of Ni–VO_x/FDU‐12 catalysts are prepared by an incipient impregnation method with FDU‐12 (cubic, Fm‐3m) as the support. The samples are characterized by nitrogen adsorption, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, H₂‐temperature programmed reduction, and X‐ray photoelectron spectroscopy. Among all catalysts, Ni–VO_x/FDU‐12 with NiO of 10 wt% and V₂O₅ of 2 wt% (10N2VF) show the best catalytic performance, which reaches maximum CO conversion and CH₄ yield of 99.4% and 89%, respectively, at 325 °C. The lifetime test is conducted at a constant temperature of 450 °C for 100 h at 0.1 MPa and a high weight hourly space velocity (WHSV) of 60 000 mL g⁻¹ h⁻¹. The 10N2VF exhibit high antisintering and coking properties. The addition of the vanadium promoter improve Ni dispersion and change Ni electron density, which enhance the low‐temperature ability for CO dissociation via the weakening of CO linkage. In contrast, a large number of oxygen vacancies formed by the oxidation–reduction cycle of V⁵⁺/V⁴⁺/V³⁺ can enhance the dissociation of the by‐product CO₂ and generate oxygen intermediates, which prevent carbon deposition on the surface of Ni particles.

中文翻译：

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Ni-VOx / FDU-12介孔催化剂上的CO甲烷化：VOx促进剂对低温活性的影响

在此，通过以FDU-12（立方，Fm-3m）为载体的初期浸渍法制备了一系列Ni-VO _x / FDU-12催化剂。样品的特征在于氮吸附，X射线衍射，扫描电子显微镜，透射电子显微镜，H ₂程序升温还原和X射线光电子能谱。在所有催化剂中，NiO为10 wt％，V ₂ O ₅为2 wt％（10N2VF）的Ni–VO _x / FDU‐12表现出最佳的催化性能，可实现最大的CO转化率和CH ₄在325℃下产率分别为99.4％和89％。寿命测试是在450℃的恒定温度下于0.1 MPa下进行100 h的测试，以及60 000 mL g ^-1  h ^-1的高重量时空速度（WHSV）。10N2VF具有很高的抗烧结和焦化性能。钒促进剂的添加改善了Ni的分散性并改变了Ni电子的密度，从而通过弱化CO键增强了低温下CO分解的能力。相比之下，由V ⁵⁺ / V ⁴⁺ / V ³⁺的氧化还原循环形成的大量氧空位可增强副产物CO ₂的离解 并生成氧气中间体，以防止碳沉积在Ni颗粒的表面。