Published May 9, 2023 | Version v1
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Reaction-Induced Metal-Metal Oxide Interactions in Pd In2O3/ZrO2 Catalysts Drive Selective and Stable CO2 Hydrogenation to Methanol

Creators

  • 1. ETH Zurich
  • 2. ICIQ
  • 3. EMPA
  • 4. TotalEnergies OneTech

Description

Ternary Pd-In2O3/ZrO2 systems hold promise as industrial catalysts for CO2-based methanol synthesis, but maximization of their productivity requires appropriate structuring of the active phase, promoter, and carrier. Here, we report that Pd-In2O3/ZrO2 systems prepared by impregnation evolve into a unique catalyst architecture under CO2 hydrogenation conditions, leading to selective and stable behavior. Detailed space and time-resolved operando characterization and simulations reveal that the restructuring process, completed within the first 30 min under reaction conditions, is governed by the energetics of metal-metal oxide interactions. The resulting architecture comprises InPdx alloy particles decorated by InOx layers, whose proximity is crucial to avoiding performance losses typically observed when palladium agglomerates. The findings highlight the potential beneficial role of reaction-induced restructuring in advancing catalyst design.

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