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Active and stable hydrotalcite derived Ni catalysts for CO2 reforming of methane: Comparison with catalysts by incipient wetness
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2018-01-12 , DOI: 10.1016/j.jcou.2017.12.018
Dori Yosef Kalai , Kristian Stangeland , Yiying Jin , Zhixin Yu

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/ (gcat 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.



中文翻译:

活性和稳定的水滑石衍生的Ni催化剂,用于甲烷CO 2重整:通过初期湿润与催化剂进行比较

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。

更新日期:2018-01-12
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