Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 11, Issue 1, Pages -Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cy01968b
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Funding
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) of MEXT [JPMXP0112101003]
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This study successfully identified various H species on the Pt/Al2O3 catalyst surface using in situ techniques and theoretical calculations. Different H species were found to play different active roles in the C2H4 hydrogenation reaction, and Al2O3 itself can also act as a hydrogen storage material.
Hydrogen (H) species adsorbed on catalyst surfaces are key intermediates in catalytic hydrogenation reactions over supported metal catalysts. However, individual identification of H species on the metal catalysts has not been established to date. Here, we elucidated the H species on Pt/Al2O3 by the combination of in situ inelastic neutron scattering (INS) and density functional theory (DFT). Several H species in the presence of H-2 were successfully identified at different sites on the Pt surface and Al2O3 support. The in situ INS and FT-IR measurements revealed that the hydride/atop Pt-H, bridged perimeter/terrace Pt-H-Pt, and threefold Pt-3-H are active intermediates in the C2H4 hydrogenation reaction, whereas the edge Pt-H-Pt is a rather inert species. In addition, the in situ measurements indicate that the Al2O3 itself acts as hydrogen storage material by mediating AlO-H and Al-H-Al species, which serve H species in the C2H4 hydrogenation reaction.
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