Dry reforming of methane (DRM) for synthesis gas production has a promising future in technological developments due to the utilization of CO₂, the principal anthropogenic greenhouse gas. However, this process is still far from industrialization because of catalyst deactivation by coking and sintering. In this study, a series of Ni(Mg)-Al hydrotalcite (HT) derived catalysts were prepared and compared to catalysts prepared by the conventional incipient wetness method. The as-prepared and calcined catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction, temperature programmed reduction, H₂-chemisorption and scanning electron microscope. DRM experiments were carried out at a very high gas hourly space velocity of 240,000 ml/ (g_cat h) to compare the activity and stability of the catalysts. The 20Ni-Mg-Al HT showed remarkably high and stable conversions in DRM at 750 °C, while the 12Ni-Al HT catalyst presented the poorest activity, resulting from impure HT structure and consequently unstable Ni particles. The 20Ni-Mg-Al HT was further proved to be active and stable under various biogas compositions, even in the deficiency of CO₂. This study demonstrates that pure HT-derived Ni catalysts are superior for DRM at different reaction conditions, and can be utilized for direct biogas upgrading.

由于主要的人为温室气体CO ₂的利用，用于合成气生产的甲烷（DRM）的干法重整在技术发展方面具有广阔的前景。但是，由于焦化和烧结引起的催化剂失活，该方法仍远未实现工业化。在这项研究中，制备了一系列Ni（Mg）-Al水滑石（HT）衍生的催化剂，并将其与通过常规初期润湿法制备的催化剂进行了比较。通过N ₂吸附-脱附，X射线衍射，程序升温还原，H _2-化学吸附和扫描电子显微镜对所制备和煅烧的催化剂进行表征。DRM实验是在240,000 ml /（g的极高气体时空速度下进行的_cat  h）比较催化剂的活性和稳定性。20Ni-Mg-Al HT在750°C的DRM中显示出非常高且稳定的转化率，而12Ni-Al HT催化剂表现出最差的活性，这归因于不纯的HT结构和不稳定的Ni颗粒。进一步证明了20Ni-Mg-Al HT在各种沼气成分下均具有活性和稳定性，即使在缺少CO _{2的情况下也是如此}。这项研究表明，纯的HT衍生的Ni催化剂在不同的反应条件下对DRM具有优越的性能，可用于直接沼气的提质。