On the Limited Role of Electronic Support Effects in Selective Alkyne Hydrogenation: A Kinetic Study of Au/MO x Catalysts Prepared from Oleylamine‐Capped Colloidal Nanoparticles

Bruno, James E.; Sravan Kumar, K. B.; Dwarica, Nicolas S.; Hüther, Alexander; Chen, Zhifeng; Guzman, IV, Clemente S.; Hand, Emily R.; Moore, William C.; Rioux, Robert M.; Grabow, Lars C.; Chandler, Bert D.

doi:10.1002/cctc.201801882

On the Limited Role of Electronic Support Effects in Selective Alkyne Hydrogenation: A Kinetic Study of Au/MO _x Catalysts Prepared from Oleylamine‐Capped Colloidal Nanoparticles

Journal Article · Thu Feb 28 00:00:00 EST 2019 · ChemCatChem

DOI:https://doi.org/10.1002/cctc.201801882· OSTI ID:1497251

Bruno, James E. ^[1]; Sravan Kumar, K. B. ^[2]; Dwarica, Nicolas S. ^[1]; Hüther, Alexander ^[1]; Chen, Zhifeng ^[3]; Guzman, IV, Clemente S. ^[1]; Hand, Emily R. ^[1]; Moore, William C. ^[1]; ^[4]; ^[2]; ^[1]

Department of Chemistry Trinity University One Trinity Place San Antonio, Texas 78240 USA
Department of Chemical and Biomolecular Engineering University of Houston Houston, Texas 77204 USA
Department of Chemical Engineering The Pennsylvania State University University Park, Pennsylvania 16802 USA
Department of Chemical Engineering The Pennsylvania State University University Park, Pennsylvania 16802 USA, Department of Chemistry The Pennsylvania State University University Park, Pennsylvania 16802 USA

Abstract

We report a quantitative kinetic evaluation and study of support effects for partial alkyne hydrogenation using oleylamine‐capped Au colloids as catalyst precursors. The amine capping agents can be removed under reducing conditions, generating supported Au nanoparticles of ∼2.5 nm in diameter. The catalysts showed high alkene selectivity (>90 %) at all conversions during alkyne partial hydrogenation. Catalytic activity, observed rate constants, and apparent activation energies (25–40 kJ/mol) were similar for all Au catalysts, indicating support effects are relatively small. Alkyne adsorption, probed with FTIR and DFT, showed adsorption on the support was associated with hydrogen‐bonding interactions. DFT calculations indicate strong alkyne adsorption on Au sites, with the strongest adsorption sites at the metal‐support interface (MSI). The catalysts had similar hydrogen reaction orders (0.7–0.9), and 1‐octyne reaction orders (∼−0.2), suggesting a common mechanism. The reaction kinetics are most consistent with a mechanism involving the non‐competitive activated adsorption of H ₂ on an alkyne‐covered Au surface.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0016192

OSTI ID:: 1497251

Alternate ID(s):: OSTI ID: 1612415

Journal Information:: ChemCatChem, Journal Name: ChemCatChem Journal Issue: 6 Vol. 11; ISSN 1867-3880

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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On the Limited Role of Electronic Support Effects in Selective Alkyne Hydrogenation: A Kinetic Study of Au/MO _x Catalysts Prepared from Oleylamine‐Capped Colloidal Nanoparticles