A series of Ni₅Ga₃/m-SiO₂/Al₂O₃/Al-fiber (m = 0, 0.5, 1.0, 3.0 and 5.0 wt%) catalysts have been developed for CO₂ hydrogenation to methanol at ambient pressure. Microfibrous-structured SiO₂/Al₂O₃/Al-fiber supports are obtained though endogenous growth of free-standing boehmite (AlOOH) nanosheets onto a three-dimensional (3D) network of 60 μm-Al-fiber thin felt with the aid of steam-only hydrothermal oxidation reaction between Al metal and H₂O (2 Al + 4H₂O → 2 AlOOH + 3H₂), followed by calcination and SiO₂-modification using silica sol. The bimetallic Ni₅Ga₃ nanoparticles are then placed onto the pore surface of as-obtained SiO₂/Al₂O₃/Al-fiber support by co-impregnation method using Ni and Ga nitrates as precursors followed by reduction in H₂ at 630 °C. The promising Ni₅Ga₃/1-SiO₂/Al₂O₃/Al-fiber catalyst is capable of converting 2.3% CO₂ into CH₃OH with a high selectivity of 86.7% as well as 10.3%/3.0% selectivities to CO/CH₄ at 210 °C, for a feed of CO₂/H₂/N₂ (2/6/1, molar ratio). Such microfibrous-structured catalyst design combines the promising catalytic performance of Ni₅Ga₃ with the enhanced heat transfer and high permeability of the Al₂O₃/Al-fiber support. The effect of SiO₂ loading on the formation of Ni₅Ga₃ alloy nanoparticles is also discussed.

已经开发了一系列Ni ₅ Ga ₃ / m -SiO ₂ / Al ₂ O ₃ / Al纤维（m  ＝ 0、0.5、1.0、3.0和5.0wt％）催化剂，用于在环境压力下将CO ₂加氢成甲醇。通过将独立的勃姆石（AlOOH）纳米片内生地生长到60μm-Al-纤维薄毡的三维（3D）网络上，可以得到微纤维结构的SiO ₂ / Al ₂ O ₃ / Al-纤维载体。金属与H ₂ O（2 Al + 4H ₂ O→2 AlOOH + 3H ₂），然后使用硅溶胶进行煅烧和SiO ₂改性。然后通过共浸渍法使用Ni和Ga硝酸盐作为前体，将双金属Ni ₅ Ga ₃纳米颗粒放置在所获得的SiO ₂ / Al ₂ O ₃ / Al纤维载体的孔表面上，然后在630还原H ₂。 ℃。有前途的Ni ₅ Ga ₃ / 1-SiO ₂ / Al ₂ O ₃ / Al纤维催化剂能够将2.3％的CO ₂转化为CH ₃ OH，选择性高，达到86.7％，选择性达到10.3％/ 3.0％。一氧化碳/甲烷₄在210℃下，用于CO ₂ / H ₂ / N ₂（2/6/1，摩尔比）的进料。这种微纤维结构的催化剂设计结合了有希望的Ni ₅ Ga ₃催化性能和Al ₂ O ₃ / Al纤维载体的增强的热传递和高渗透性。还讨论了SiO ₂负载对Ni ₅ Ga ₃合金纳米颗粒形成的影响。