期刊
ACS CATALYSIS
卷 8, 期 5, 页码 4390-4401出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00474
关键词
Cu/Zn/Ga catalysts; metal nanoparticle; layered double hydroxides; methanol synthesis; CO2 hydrogenation
资金
- Swire Scholarship of Oxford
Ultrathin (1-3 cationic-layers) (CuZn)(1-x)Ga-x-CO3 layered double hydroxide (LDH) nanosheets were synthesized following the aqueous miscible organic solvent treatment (AMOST) method and applied as catalyst precursors for methanol production from CO2 hydrogenation. It is found that, upon reduction, the aqueous miscible organic solvent treated LDH (AMO-LDH) samples above a critical Ga3+ composition give consistently and significantly higher Cu surface areas and dispersions than the catalysts prepared from conventional hydroxyl -carbonate phases. Owing to the distinctive local steric and electrostatic stabilization of the ultrathin LDH structure, the newly formed active Cu(Zn) metal atoms can be stably embedded in the cationic layers, exerting an enhancement to the catalytic reaction. The best catalyst in this study displayed methanol productivity with a spacetime yield of 0.6 g(MeOH.gcat)(-1)h(-1) under typical reaction conditions, which, as far as we are aware, is higher than most reported Cu-based catalysts in the literature.
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