CO₂ methanation using nickel-based catalysts has attracted large interest as a promising power-to-gas route. Ni nanoparticles supported on nitrogen-doped CNTs with Ni loadings in the range from 10 wt% to 50 wt% were synthesized by impregnation, calcination and reduction and characterized by elemental analysis, X-ray powder diffraction, H₂ temperature-programmed reduction, CO pulse chemisorption and transmission electron microscopy. The Ni/NCNT catalysts were highly active in CO₂ methanation at atmospheric pressure, reaching over 50% CO₂ conversion and over 95% CH₄ selectivity at 340 °C and a GHSV of 50,000 mL g⁻¹ h⁻¹ under kinetically controlled conditions. The small Ni particle sizes below 10 nm despite the high Ni loading is ascribed to the efficient anchoring on the N-doped CNTs. The optimum loading of 30 wt%–40 wt% Ni was found to result in the highest Ni surface area, the highest degree of conversion and the highest selectivity to methane. A constant TOF of 0.3 s⁻¹ was obtained indicating similar catalytic properties of the Ni nanoparticles in the range from 10 wt% to 50 wt% Ni loading. Long-term experiments showed that the Ni/NCNT catalyst with 30 wt% Ni was highly stable for 100 h time on stream.

使用镍基催化剂的CO ₂甲烷化作为一种​​有前途的动力气路线引起了广泛的兴趣。通过浸渍，煅烧和还原合成了负载在10％（重量）至50％（重量）的掺氮CNT上的Ni纳米颗粒，并通过元素分析，X射线粉末衍射，H _2程序升温还原，CO脉冲化学吸附和透射电子显微镜。Ni / NCNT催化剂在大气压下在CO ₂甲烷化中具有很高的活性，在340°C和GHSV为50,000 mL g ^-1  h ^-1的条件下，CO ₂转化率超过50％，CH ₄选择性超过95％。在动力学控制的条件下。尽管Ni含量较高，但10 nm以下的Ni颗粒较小，这归因于N掺杂CNT的有效锚固。发现最佳负载量为30 wt％–40 wt％Ni可导致最高的Ni表面积，最高的转化度和最高的甲烷选择性。获得0.3 s ^-1的恒定TOF，表明Ni纳米颗粒在10重量％至50重量％的镍负载量范围内具有相似的催化性能。长期实验表明，含30％（重量）Ni的Ni / NCNT催化剂在运行100小时内具有很高的稳定性。