Rational Design of Low-Temperature Hydrogenation Catalysts: Theoretical Predictions and Experimental Verification

The shape sensitivity of monometallic Pt and bimetallic PtÀNi nanocrystals in a,b-unsaturated aldehydes is studied by using a cubic shape enclosed by six {100} facets as well as an octahedral shape surrounded by eight {111} facets. Compared with monometallic Pt and bimetallic PtÀNi cubic/octahedral shapes, Pt 3 Ni cubes enhanced the selective hydrogenation of the C=O double bond and suppressed the selective hydrogenation of the C=C double bond of the a,b-unsaturated aldehyde. The Pt, Pt 3 Ni, or PtNi octahedral shape is an unfavorable structure for C=O hydrogenation and enables the activation of the whole conjugated system of the molecule, which leads to complete hydrogenation to form the saturated alcohol product. The synergistic effects of the surface structure and electronic properties of Pt or PtÀNi nanocrystals play a key role in controlling the selective hydrogenation of C=C and C=O bonds of a,b-unsaturated aldehydes.Great effort has been made to control the selective hydrogenation of C=O and C=C bonds of a,b-unsaturated aldehydes or ketones for valuable industrial products. [1][2][3][4][5] The difference in bond energy-715 kJ mol À1 for the energy of the C=O double bond and 615 kJ mol À1 for the C=C double bond-makes the hydrogenation of the C=O bond more difficult than hydrogenation of the C=C bond, yet the resulting unsaturated alcohol products from C=O hydrogenation are valuable intermediates for the production of perfumes and flavorings. [6][7][8][9] Selective hydrogenation of a,b-unsaturated aldehydes/ketones is often used as a structure-dependent reaction to investigate the capability of the hydrogenation of C=O and C=C bonds over model catalysts. As we already know, the catalytic activity and selectivity are affected by several factors, including catalyst preparation and activation procedures, the geometric structure of catalysts, as well as the electronic structure of catalysts. [10][11][12][13][14][15] Therefore, many attempts have been made to promote the hydrogenation of the C=O double bond by taking advantage of the synergistic effects of metallic catalysts, in which bimetallic catalysts with particular geometric and electronic structures display strongly structure-dependent behavior. [16][17][18][19][20] In particular, Pt-based bimetallic nanocrystals such as pure Pt crystals exhibit defined crystallographic planes and can be used to explore the structure sensitivity of liquid-phase reactions. [21][22][23][24][25][26] Benzene hydrogenation was used as a example to demonstrate that both cyclohexene and cyclohexane formed on cuboctahedral Pt nanoparticles, and only cyclohexane formed on cubic Pt nanoparticles. [27] In this study, monometallic Pt and bimetallic PtÀNi (Pt atoms replaced with Ni atoms) nanocrystals with a well-defined cubic shape enclosed by six {100} facets as well as an octahedral shape surrounded by eight {111} facets were synthesized. Herein, the replacement of one atom of every four Pt atoms or two Pt atoms with one Ni atom (referred to as Pt 3 Ni and PtNi) can be effectively ...

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Structure‐Dependent Selective Hydrogenation of α,β‐Unsaturated Aldehydes over Platinum Nanocrystals Decorated with Nickel

Zhi

Zhao

Kong

et al. 2014

ChemPlusChem

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A High (Z)/(E) Ratio Obtained During the 3-Hexyne Hydrogenation with a Catalyst Based on a Rh(I) Complex Anchored on a Carbonaceous Support

Liprandi¹,

Cagnola²,

Paredes³

et al. 2011

Catal Lett

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Partial hydrogenation of 3-hexyne over low-loaded palladium mono and bimetallic catalysts

Maccarrone

Lederhos

Torres

et al. 2012

Applied Catalysis A: General

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Rational Design of Low-Temperature Hydrogenation Catalysts: Theoretical Predictions and Experimental Verification

Cited by 11 publications

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Structure‐Dependent Selective Hydrogenation of α,β‐Unsaturated Aldehydes over Platinum Nanocrystals Decorated with Nickel

Structure‐Dependent Selective Hydrogenation of α,β‐Unsaturated Aldehydes over Platinum Nanocrystals Decorated with Nickel

A High (Z)/(E) Ratio Obtained During the 3-Hexyne Hydrogenation with a Catalyst Based on a Rh(I) Complex Anchored on a Carbonaceous Support

Partial hydrogenation of 3-hexyne over low-loaded palladium mono and bimetallic catalysts

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