Liao Lin, Chen Lidong, Ye Run-Ping, Tang Xiaolu, Liu Jian
Institute of Chemistry for Functionalized Materials, School of Chemistry and Chemical Engineering, Liaoning Normal University, 850 Huanghe Road, Dalian, 116029, P. R. China.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, Liaoning, P. R. China.
Chem Asian J. 2021 Mar 15;16(6):678-689. doi: 10.1002/asia.202001384. Epub 2021 Feb 15.
CO is the main component of greenhouse gases and also an important carbon source. The hydrogenation of CO to methane using Ni-based catalysts can not only alleviate CO emissions but also obtain useful fuels. However, Ni-based catalysts face one major problem of the sintering of Ni nanoparticles in the process of CO methanation. Thus, this work has synthesized a series of efficient and robust nickel silicate catalysts (NiPS-X) with different nickel content derived from nickel phyllosilicate by the hydrothermal method. It was found that the Ni loading plays a critical role in the structure and catalytic performance of the NiPS-X catalysts. The catalytic performance gradually increases with the increase of Ni loading. In particular, the highly dispersed NiPS-1.6 catalyst with a high Ni loading of 34.3 wt% could obtain the CO conversion greater than 80%, and the methane selectivity was close to 100% for 48 h at 330 °C and the GHSV of 40,000 mL g h . The excellent catalytic property can be assigned to the high dispersion of Ni nanoparticles and the strong interaction between the active component and the carrier, which is derived from a unique layered silicate structure with lots of nickel phyllosilicate and a large number of Lewis acid sites.
一氧化碳是温室气体的主要成分，也是重要的碳源。使用镍基催化剂将一氧化碳加氢制甲烷，不仅可以减少一氧化碳排放，还能获得有用的燃料。然而，镍基催化剂在一氧化碳甲烷化过程中面临镍纳米颗粒烧结这一主要问题。因此，本工作通过水热法合成了一系列由镍层状硅酸盐衍生的、具有不同镍含量的高效且稳定的硅酸镍催化剂（NiPS-X）。研究发现，镍负载量对NiPS-X催化剂的结构和催化性能起着关键作用。催化性能随镍负载量的增加而逐渐提高。特别是，高镍负载量为34.3 wt%的高度分散的NiPS-1.6催化剂，在330 °C和40,000 mL g⁻¹ h⁻¹的气体时空速下，48小时内一氧化碳转化率大于80%，甲烷选择性接近100%。这种优异的催化性能可归因于镍纳米颗粒的高度分散以及活性组分与载体之间的强相互作用，这源于具有大量镍层状硅酸盐和大量路易斯酸位点的独特层状硅酸盐结构。
