Carbon based framework are believed to be adsorbed large amount of hydrogen reversibly on its surface and this adsorbed active H-species can increase the rate of surface hydrogenation reactions. The basic nitrogen functionality if present can provides additional sites for adsorption of CO₂ molecule. On this regard, CO₂ hydrogenation has been investigated on multifunctional nitrogen doped carbon (CNx) consisting of Ni-Ga nanoparticles. Alloy nanoparticles (2–10 nm) of Ni₃Ga and Ni₃Ga₅ has been identified from HR-TEM in combination of d value calculation form XRD. Whereas, mix Ni and Ni-Ga phase appears in case of higher loading catalyst i.e. NG-CNx-3. Under experimental conditions (2 MPa, 280 °C), the CO₂ hydrogenation products are CH₄, CO (major) and methanol. The activity of the synthesised catalysts strictly depends on the synthesis method and support. The catalyst consisting 14 and 9 (wt %) of Ni and Ga on CNx (NG-CNx-2) shows highest catalytic activity in terms of CO₂ conversion. While NGBCNx-2 with 14 and 9 (wt %) of Ni and Ga on BCNx is found to be active towards methanol selectivity which may be due to the finely dispersed Ni-Ga alloy nanoparticles with size distribution between 2–5 nm.

据信碳基骨架可逆地在其表面吸附大量氢，这种吸附的活性H物种可提高表面氢化反应的速率。如果存在的话，基本的氮官能度可以为CO ₂分子的吸附提供额外的位置。在这方面，已经对由Ni-Ga纳米颗粒组成的多功能氮掺杂碳（CNx）进行了CO ₂加氢研究。从HR-TEM结合X值d值计算，已经鉴定出Ni ₃ Ga和Ni ₃ Ga _5的合金纳米颗粒（2-10 nm）。而在高负载催化剂（即NG-CNx-3）的情况下，会出现Ni和Ni-Ga混合相。在实验条件下（2 MPa，280°C），CO_2种氢化产物是CH ₄，CO（主要）和甲醇。合成催化剂的活性严格取决于合成方法和载体。在CNx（NG-CNx-2）上由14和9（wt％）的Ni和Ga（wt％）组成的催化剂显示出最高的催化活性，以CO ₂转化率计。虽然发现BCNx上具有14和9（wt％）Ni和Ga（wt％）的NGBCNx-2对甲醇选择性具有活性，这可能是由于细分散的Ni-Ga合金纳米粒子的尺寸分布在2–5 nm之间。