Selectivity enhancement in acetylene hydrogenation over diphenyl sulphide-modified Pd/TiO2 catalysts

McKenna, Fiona-Mairéad; Anderson, James A.

doi:10.1016/j.jcat.2011.05.003

Cited by 112 publications

(95 citation statements)

References 35 publications

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“…Triphenylphosphine treated sample performed significantly better with only 5% of the feed ethylene being hydrogenated [50]. In agreement with non-competitive reactions, diphenylsulfide acted as a more effective modifier resulting in a net gain in ethylene [46]. Subsequent catalyst testing at moderate pressure indicated that enhanced selectivity could be retained at 10 bar pressure in the presence of CO [49], although tests with triphenylphosphine treated Pd/TiO 2 in the absence of CO fail to show enhanced selectivity [50].…”

Section: Organic Selectivity Modifiersmentioning

confidence: 57%

“…This is in contrast to triphenylphosphine treated Pd/TiO 2 where the rate of acetylene hydrogenation was increased and the rate of ethylene hydrogenation decreased by more than 80% [50]. The use of diphenylsulfide resulted in negligible change to the rate at which acetylene was hydrogenated but completely supressed ethylene hydrogenation under noncompetitive conditions [46].…”

Section: Organic Selectivity Modifiersmentioning

confidence: 76%

“…The group of Anderson investigated the adsorption of organic sulfur [46][47][48][49] and phosphorous [48][49][50] modifiers on acetylene hydrogenation. Diphenylsulfide and triphenylphosphine were adsorbed onto a Pd/TiO 2 catalyst by impregnation from a hexane solution.…”

Section: Organic Selectivity Modifiersmentioning

confidence: 99%

“…In the case of diphenylsulfide, reduction at 393 K appeared to result in the loss of the phenyl ligands with the sulfur atom being retained. Catalyst performance was first accessed by measuring the reaction rate of acetylene and ethylene in separate non-competitive reactions [46]. Freshly reduced Pd/TiO 2 hydrogenated both acetylene and ethylene at a similar rate (Fig.…”

Section: Organic Selectivity Modifiersmentioning

confidence: 99%

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Recent advances in selective acetylene hydrogenation using palladium containing catalysts

McCue

Anderson

2015

Front. Chem. Sci. Eng.

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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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Section: Organic Selectivity Modifiersmentioning

confidence: 57%

Section: Organic Selectivity Modifiersmentioning

confidence: 76%

Section: Organic Selectivity Modifiersmentioning

confidence: 99%

Section: Organic Selectivity Modifiersmentioning

confidence: 99%

See 2 more Smart Citations

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

McCue

Anderson

2015

Front. Chem. Sci. Eng.

Self Cite

231

196

View full text Add to dashboard Cite

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“…Analogously, diphenyl sulphide ligands on Pd/TiO 2 surface generate an appropriate ensemble which accommodates alkynes, but prevents the adsorption of alkenes, thus promoting the selective hydrogenation of acetylene to ethylene [81]. Residual PVA on TiO 2 -supported Au NPs results in a porous-like structure in which the OH groups of PVA interact with the analogous groups of glycerol [65].…”

Section: Steric Effects and Surface Crowdingmentioning

confidence: 99%

Untangling the Role of the Capping Agent in Nanocatalysis: Recent Advances and Perspectives

et al. 2016

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Capping agents (organic ligands, polymers, surfactants, etc.) are a basic component in the synthesis of metal nanoparticles with controlled size and well-defined shape. However, their influence on the performances of nanoparticle-based catalysts is multifaceted and controversial. Indeed, capping agent can act as a "poison", limiting the accessibility of active sites, as well as a "promoter", producing improved yields and unpredicted selectivity control. These effects can be ascribed to the creation of a metal-ligand interphase, whose unique properties are responsible for the catalytic behavior. Therefore, understanding the structure of this interphase is of prime interest for the optimization of tailored nanocatalyst design. This review provides an overview of the interfacial key features affecting the catalytic performances and details a selection of related literature examples. Furthermore, we highlight critical points necessary for the design of highly selective and active catalysts with surface and interphase control.

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Creation of Redox‐Active PdS_x Nanoparticles Inside the Defect Pores of MOF UiO‐66 with Unique Semihydrogenation Catalytic Properties

Dong

Wang

2019

Adv Funct Materials

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Semihydrogenation of alkynes to produce alkenes is very important in the industry; however, over‐hydrogenation heavily complicates the postprocesses, which are highly energy consuming and not environmentally friendly. One of the most efficient pathways to solve this challenging issue is to develop highly selective catalysts that could only hydrogenate alkynes and are inactive in hydrogenation of alkenes. This work presents herein an efficient catalyst, consisting of in situ created PdS0.53 nanoparticles as the redox‐active sites inside the defect pores of metal–organic framework UiO‐66, which demonstrates very high alkene selectivity (up to 99.5%) in semihydrogenation of easily over‐hydrogenated terminal alkynes. In contrast to the traditional catalysts, strict control over the reaction time becomes the nonessential condition because the catalyst system is almost inactive in hydrogenation of alkenes. Therefore, this paradigm work provides a practically applicable pathway for the development of efficient catalysts with unique catalytic properties for selective semihydrogenation reactions.

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Selectivity enhancement in acetylene hydrogenation over diphenyl sulphide-modified Pd/TiO2 catalysts

Cited by 112 publications

References 35 publications

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Untangling the Role of the Capping Agent in Nanocatalysis: Recent Advances and Perspectives

Creation of Redox‐Active PdS_x Nanoparticles Inside the Defect Pores of MOF UiO‐66 with Unique Semihydrogenation Catalytic Properties

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Selectivity enhancement in acetylene hydrogenation over diphenyl sulphide-modified Pd/TiO2 catalysts

Cited by 112 publications

References 35 publications

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Untangling the Role of the Capping Agent in Nanocatalysis: Recent Advances and Perspectives

Creation of Redox‐Active PdSx Nanoparticles Inside the Defect Pores of MOF UiO‐66 with Unique Semihydrogenation Catalytic Properties

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Product

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Creation of Redox‐Active PdS_x Nanoparticles Inside the Defect Pores of MOF UiO‐66 with Unique Semihydrogenation Catalytic Properties