Selective hydrogenation of acetylene in excess ethylene using Ag- and Au–Pd/SiO2 bimetallic catalysts prepared by electroless deposition

Zhang, Yunya; Diao, Weijian; Williams, Christopher T.; Monnier, John R.

doi:10.1016/j.apcata.2013.10.024

Cited by 123 publications

(118 citation statements)

References 28 publications

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“…By controlling the base catalyst, secondary metal ion source, reducing agent, bath temperature, and pH, our group has successfully synthesized multiple bimetallic catalyst systems, such as Cu-Pd 22 , Ag-Pt 23 , Pd-Co 24 , Au-Pd 25 , Ag-Pd 26 .…”

Section: Ru + H ଶ O → Ru − Oh + H ା + E ିmentioning

confidence: 99%

Preparation and Characterization of Pt–Ru Bimetallic Catalysts Synthesized by Electroless Deposition Methods

et al. 2015

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Two series of Pt@Ru/C and Ru@Pt/C bimetallic catalysts have been prepared by electroless deposition (ED) method. For Pt@Ru/C compositions, a new ED bath was developed using Ru(NH 3 ) 6 Cl 3 as Ru precursor and HCOOH as reducing agent. For Ru@Pt/C preparations, a standard bath using H 2 PtCl 6 and DMAB as Pt precursor and reducing agent, respectively, was employed. The Pt@Ru/C and Ru@Pt/C bimetallic catalysts have been characterized by temperature programmed reduction (TPR), selective chemisorption, X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy (STEM) with X-ray energy dispersive spectroscopy (XEDS). TPR and selective chemisorption (H 2 titration of oxygen precovered surfaces) experiments have confirmed the existence of strong surface interactions between Pt and Ru as evidenced by hydrogen spillover of Pt to Ru (Pt-assisted reduction of oxygen pre-covered Ru). XPS analyses also showed e -transfer from Pt to Ru on the bimetallic surface, again indicating strong surface interactions between Pt and Ru. Finally, the STEM images and XEDS elemental maps provided strong visual evidence of targeted deposition of the secondary metal on the primary metal. The elemental maps confirmed that individual nanoparticles of both Pt@Ru/C and Ru@Pt/C catalysts prepared by ED were bimetallic, with excellent association between the primary and the secondary metals. KEYWORDPlatinum; Ruthenium; Electroless deposition; Bimetallic catalyst; Strong metal-metal interaction . INTRODUCTION The platinum-ruthenium (Pt-Ru) bimetallic system has been extensively studied since the early 1900s. Synergistic effects have been observed for a variety of reactions, primarily skeletal isomerization reactions (hydrogenolysis of C−C bonds) for catalytic reforming of alkanes to increase octane values by conversion into aromatics, cycloalkanes, and branched acyclic alkanes. 1-3 Pt-Ru catalysts have also been used for the selective hydrogenation of multifunctional olefins for the production of higher value chemicals; 4 exemplary reactions include selective hydrogenation of cinnamaldehyde 5,6 , citral 7 , ortho-chloronitrobenzene 8,9 , glycerol 10 and α, β-unsaturated aldehydes 11,12 . With the combination of high activity for hydrogenation of C=O bonds from Ru and facile hydrogenation ability of C=C bonds from Pt, specific Pt-Ru catalysts have shown high activity for hydrogenation of variety chemicals and selective hydrogenation of specific functional groups of multi-functional olefins. More recently, Pt-Ru catalysts have been used for fuel cell applications where alcohols are used as H 2 sources at the anode of PEM fuel cells. Specifically, it has been shown that anodic Pt-Ru catalysts provide optimal performance for direct methanol fuel cells (DMFC) relative to Pt monometallic catalysts. Platinum catalysts typically lose activity due to poisoning from strongly-adsorbed CO generated during methanol reforming. The presence of surface Ru minimizes effects of CO poisoning by the direct interaction between Ru and Pt surface...

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Section: Ru + H ଶ O → Ru − Oh + H ା + E ିmentioning

confidence: 99%

Preparation and Characterization of Pt–Ru Bimetallic Catalysts Synthesized by Electroless Deposition Methods

et al. 2015

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“…It was thought that this method shows wider ranging promise since coreshell type structures are not readily prepared by simple synthetic methods. In principle, similar materials were prepared by Zhang et al [52] using electroless deposition of Ag or Au onto a pre-made Pd/SiO 2 catalyst. Selective chemisorption was used to estimate Ag/Au surface coverage and indicated that higher metal loadings were necessary to achieve high Ag/Au surface coverage suggesting a degree of metal mixing (likely associated with thermal reduction at 473 K).…”

Section: Addition Of a Second Metalmentioning

confidence: 99%

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

McCue

Anderson

2015

Front. Chem. Sci. Eng.

229

196

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Recent advances with Pd containing catalysts for the selective hydrogenation of acetylene are described. The overview classifies enhancement of catalytic properties for monometallic and bimetallic Pd catalysts. Activity/ selectivity of Pd catalysts can be modified by controlling particle shape/morphology or immobilisation on a support which interacts strongly with Pd particles. In both cases enhanced ethylene selectivity is generally associated with modifying ethylene adsorption strength and/or changes to hydride formation. Inorganic and organic selectivity modifiers (i.e., species adsorbed onto Pd particle surface) have also been shown to enhance ethylene selectivity. Inorganic modifiers such as TiO 2 change Pd ensemble size and modify ethylene adsorption strength whereas organic modifiers such as diphenylsulfide are thought to create a surface template effect which favours acetylene adsorption with respect to ethylene. A number of metals and synthetic approaches have been explored to prepare Pd bimetallic catalysts. Examples where enhanced selectivity is observed are generally associated with decreased Pd ensemble size and/or hindering of the ease with which an unselective hydride phase is formed for Pd. A final class of bimetallic catalysts are discussed where Pd is not thought to be the primary reaction site but merely acts as a site where hydrogen dissociation and spillover occurs onto a second metal (Cu or Au) where the reaction takes place more selectively.

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“…One means is to dope the Au catalyst with a second metal. In particular, supported Au-Pd catalysts have been widely studied in selective hydrogenation of acetylene [4][5][6][7][8]. Besides, it is easy for Au and Pd to form alloy, thus the interaction between Au and Pd will not only be beneficial to the activity but also keep a high selectivity of ethylene at the same time during hydrogenation of acetylene to ethylene.…”

Section: Introductionmentioning

confidence: 99%

Radio-frequency H2 plasma treatment of AuPd/TiO2 catalyst for selective hydrogenation of acetylene in excess ethylene

et al. 2015

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Selective hydrogenation of acetylene in excess ethylene using Ag- and Au–Pd/SiO2 bimetallic catalysts prepared by electroless deposition

Cited by 123 publications

References 28 publications

Preparation and Characterization of Pt–Ru Bimetallic Catalysts Synthesized by Electroless Deposition Methods

Preparation and Characterization of Pt–Ru Bimetallic Catalysts Synthesized by Electroless Deposition Methods

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Radio-frequency H2 plasma treatment of AuPd/TiO2 catalyst for selective hydrogenation of acetylene in excess ethylene

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