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How Does the Ni-Ga Alloy Structure Tune Methanol Productivity and Selectivity?

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The structure of nickel-gallium (Ni-Ga) alloy catalysts supported on silicon dioxide (SiO2) significantly impacts their performance in carbon dioxide (CO2) hydrogenation to methanol. Optimized Ni-Ga phases, particularly Ni3Ga, demonstrate superior activity and selectivity for methanol production.

Keywords:
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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Chemical engineering

Background:

  • Catalyst structure-activity relationships are crucial for optimizing chemical reactions.
  • Nickel-gallium (Ni-Ga) alloys are investigated for CO2 hydrogenation.
  • Understanding the role of alloy phases and support interactions is key.

Purpose of the Study:

  • To investigate the influence of Ni-Ga alloy phase structure on CO2 hydrogenation to methanol.
  • To correlate catalyst structure with activity and selectivity.
  • To elucidate the mechanism of methanol formation over different Ni-Ga phases.

Main Methods:

  • Synthesis of SiO2-supported Ni-Ga catalysts with distinct phases (α-Ni, α-Ni9Ga, α'-Ni3Ga, δ-Ni5Ga3) via hydrothermal deposition-precipitation.
  • Characterization using operando X-ray pair distribution function analysis and X-ray absorption spectroscopy.
  • Activity and selectivity measurements for CO2 hydrogenation; Density Functional Theory (DFT) calculations.

Main Results:

  • Catalysts α'-Ni3Ga/SiO2 and δ-Ni5Ga3/SiO2 exhibited significantly higher methanol formation rates (27x) compared to α-Ni9Ga/SiO2 and α-Ni/SiO2.
  • α'-Ni3Ga/SiO2 demonstrated the highest methanol selectivity (71%), challenging previous assumptions about its catalytic performance.
  • DFT calculations revealed that Ni-rich step sites in α'-Ni3Ga stabilize key intermediates (HCOO*, CH3O*), while GaOx species mitigate CO* adsorption, promoting methanol formation.

Conclusions:

  • The specific Ni-Ga alloy phase structure is critical for high methanol productivity and selectivity in CO2 hydrogenation.
  • The presence of GaOx species plays a vital role in modulating catalyst electronic properties and stabilizing reaction intermediates.
  • This work provides insights into designing advanced catalysts for selective methanol synthesis by controlling metallic and oxidic species.