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Understanding of tri-reforming of methane over Ni/Mg/Al hydrotalcite-derived catalyst for CO2 utilization from flue gases from natural gas-fired power plants
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2020-09-25 , DOI: 10.1016/j.jcou.2020.101317
Katarzyna Świrk , Jacek Grams , Monika Motak , Patrick Da Costa , Teresa Grzybek

Tri-reforming of methane was examined over Ni/Mg/Al hydrotalcite-derived catalyst for CO2 utilization directly from simulated flue gas mixtures from natural gas-fired power plants. This catalyst showed promising results for the studied experimental conditions, revealing the following order of CH4 conversion: TRM3 (75.9 %) < TRM2 (91.9 %) < TRM1 (98.2 %). The activity trend was related to the Ni crystallite size, with smaller particles leading to increased conversion. The highest TOF value was found for gas feed with elevated CH4 concentration (TRM3), possibly due to a significant contribution of side reactions parallelly occurring during tri-reforming of methane. The HTNi catalyst after TRM3 showed bigger Ni0 particles, which are prone to participate in the formation of graphitic-like carbon. The presence of encapsulated Ni particles and carbon nanotubes was confirmed by XRD, TGA, HRTEM, and ToF-SIMS for HTNi used in TRM3.



中文翻译:

理解由Ni / Mg / Al水滑石衍生的催化剂对甲烷进行三重整,以利用天然气发电厂的烟道气中的CO 2

直接从天然气发电厂的模拟烟气混合物中,对Ni / Mg / Al水滑石衍生的催化剂进行了甲烷三重整,以检测CO 2的利用。该催化剂在所研究的实验条件下显示出令人鼓舞的结果,揭示出CH 4转化的顺序如下:TRM3(75.9%)<TRM2(91.9%)<TRM1(98.2%)。活性趋势与镍微晶尺寸有关,较小的颗粒导致转化率增加。对于CH 4浓度升高的气体进料(TRM3),发现最高的TOF值可能是由于甲烷三重整过程中平行发生的副反应的重要影响。TRM3之后的HTNi催化剂显示较大的Ni 0容易参与形成石墨状碳的颗粒。XRD,TGA,HRTEM和用于TRM3的HTNi的ToF-SIMS证实了封装的Ni颗粒和碳纳米管的存在。

更新日期:2020-09-26
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