NiGa nano-alloy for the dry reforming of methane: Influences of Ga alloying with Ni on the catalytic activity and stability
2024; Elsevier BV; Volume: 487; Linguagem: Inglês
10.1016/j.cej.2024.150351
ISSN1873-3212
AutoresXuqiang Liu, Fengyang Jiang, Kun Liu, Guofeng Zhao, Jin‐Ku Liu, Haitao Xu,
Tópico(s)Ammonia Synthesis and Nitrogen Reduction
Resumo• NiGa nanoalloy was excellent performance for the dry reforming of methane: three birds with one arrow. • NiGa IMC was identified as Ni 3 Ga in the catalyst Ni 60 Ga 40 /Al 2 O 3. • Ni 3 Ga IMC could inhibit the sintering of Ni and rapid cracking of CH 4. • Ga 2 O 3 -Al 2 O 3 boosted CO 2 activation. The massive emission of CO 2 and CH 4 has caused serious environmental and ecological problems, and dry reforming of methane reaction has received widespread attentions due to the fact that it can eliminate the two gas simultaneously. Herein, Ni 60 Ga 40 /Al 2 O 3 (molar ratio of Ni:Ga was 60:40) catalyst was synthesized by mechanochemical synthesis method, offering 75 % CH 4 conversion, 85 % CO 2 conversion, and H 2 /CO ratio of 0.93 at 750 °C during 120 h test. Ni in Ni 60 Ga 40 /Al 2 O 3 combines with Ga to form Ni 3 Ga intermetallic compound, which inhibits the sintering of Ni and rapid cracking of CH 4 . Moreover, the extra Ga species, existing in the form of Ga 2 O 3 -Al 2 O 3 with abundant oxygen vacancy, boosts CO 2 activation and prevents carbon development on catalyst surface. In contrast, for the pure Ni/Al 2 O 3 and Ga/Al 2 O 3 catalysts, the stability and catalytic activity couldn't be obtained synchronously. This work particularly investigated the CH 4 dissociation and CO 2 activation for the NiGa/Al 2 O 3 catalysts, establishing the foundation for rational design of low-cost performance catalysts for the dry reforming of methane reactions.
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