Ni–Al₂O₃ catalysts with different Ni percentages were prepared by a simple mechanochemical method, and the catalysts were employed in the methanation of CO₂ for hydrogen purification. BET, XRD, EDS, SEM, TPR, TGA, and FTIR analyses were conducted to identify the chemicophysical characteristics of the prepared samples. The results confirmed that the simple mechanochemical synthesis method was operational and effective to synthesize the Ni catalysts with a high BET area (175.4–296.5 m²/g). With an increase in Ni percentage from 5 to 20 wt%, the size of the Ni particle increased from 2.7 nm to 7.8 nm, and also the BET area decreased from 296.5 to 175.4 m²/g. According to the TPR results, the reducibility of the samples improved with the increase of Ni content. Based on the catalytic performance results the catalyst with 15 wt% Ni and the BET area of 183.2 m²/g exhibited the best performance in methanation of CO₂ (75.2% conversion of CO₂ and 96.8% selectivity of CH₄ at 400 °C). The 15Ni–Al₂O₃ catalyst showed stable stability during 10 h. CO methanation was investigated on the 15 wt%Ni–Al₂O₃ catalyst and the results showed that CO completely converted to CH₄ at 300 °C.

通过简单的机械化学方法制备了不同Ni含量的Ni–Al ₂ O ₃催化剂，并将该催化剂用于CO ₂甲烷化以纯化氢。进行了BET，XRD，EDS，SEM，TPR，TGA和FTIR分析，以鉴定所制备样品的化学物理特性。结果证实，简单的机械化学合成方法可操作且有效地合成高BET面积（175.4–296.5 m ² / g）的Ni催化剂。随着Ni百分比从5 wt％增加到20 wt％，Ni颗粒的尺寸从2.7 nm增加到7.8 nm，并且BET面积从296.5减少到175.4 m ²/G。根据TPR结果，样品的还原性随Ni含量的增加而提高。根据催化性能结果，Ni含量为15 wt％，BET面积为183.2 m ² / g的催化剂在CO ₂甲烷化方面表现出最佳性能（400°C时，CO ₂转化率为75.2％，CH ₄选择性为96.8％）。）。15Ni-Al ₂ O ₃催化剂在10小时内显示出稳定的稳定性。在15 wt％Ni-Al ₂ O ₃催化剂上研究了CO甲烷化反应，结果表明CO在300°C时完全转化为CH ₄。