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J Am Chem Soc. 2016 Sep 28;138(38):12440-50. doi: 10.1021/jacs.6b05791. Epub 2016 Sep 14.

Optimizing Binding Energies of Key Intermediates for CO2 Hydrogenation to Methanol over Oxide-Supported Copper.

Author information

1
Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States.
2
Department of Chemical Engineering, Tsinghua University , Beijing 100084, China.
3
Chemistry Department, Stony Brook University , Stony Brook, New York 11794, United States.
4
Department of Chemical Engineering, Columbia University , New York, New York 10027, United States.

Abstract

Rational optimization of catalytic performance has been one of the major challenges in catalysis. Here we report a bottom-up study on the ability of TiO2 and ZrO2 to optimize the CO2 conversion to methanol on Cu, using combined density functional theory (DFT) calculations, kinetic Monte Carlo (KMC) simulations, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements, and steady-state flow reactor tests. The theoretical results from DFT and KMC agree with in situ DRIFTS measurements, showing that both TiO2 and ZrO2 help to promote methanol synthesis on Cu via carboxyl intermediates and the reverse water-gas-shift (RWGS) pathway; the formate intermediates, on the other hand, likely act as a spectator eventually. The origin of the superior promoting effect of ZrO2 is associated with the fine-tuning capability of reduced Zr(3+) at the interface, being able to bind the key reaction intermediates, e.g. *CO2, *CO, *HCO, and *H2CO, moderately to facilitate methanol formation. This study demonstrates the importance of synergy between theory and experiments to elucidate the complex reaction mechanisms of CO2 hydrogenation for the realization of a better catalyst by design.

PMID:
27571313
DOI:
10.1021/jacs.6b05791

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