Acetylene hydrogenation over structured Au–Pd catalysts

McCue, Alan J.; Baker, Richard T.; Anderson, James A.

doi:10.1039/c5fd00188a

Cited by 33 publications

(33 citation statements)

References 70 publications

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“…[2] Pd-based catalysts generally demonstrate high activity but limited selectivity in this reaction due to hydride/carbide formation [8,9,10,11,12,13] with calculations suggesting that the barrier for ethylene desorption is higher than that for over-hydrogenation. [14] A common approach to improve ethylene selectivity over Pd nanocatalysts is to alloy with a second metal such as Ag [15,16,17] , Au [18,19] , Cu [20,21,22,23,24] , Ni [25] , and Zn [26] , which dilutes Pd and reduces the e se le size, a d thus i hi its fo atio of the β-PdH phase. [11] I e e t lite atu e, the idea of Pd a ti e site isolatio has e o e popula a d t pi all o t i utes to e ha ed alke e sele ti it .…”

Section: Introductionmentioning

confidence: 99%

Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation

Liu

McCue

Feng

et al. 2018

Journal of Catalysis

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Unsupported, bulk phase palladium sulfide has been studied for the selective hydrogenation of acetylene. The sample underwent significant change during thermal pretreatments, the extent of which depends on temperature. Exposure to hydrogen at temperatures of 150°C or above results in the loss of sulfur from the sample, primarily as hydrogen sulfide. As sulfur is lost, the sample is progressively transformed from a sulfur rich phase (PdS) to a sulfur lean phase (Pd4S) via an intermediate phase (Pd16S7). Reduction at 250°C produces a material, which contains simultaneously these three phases mentioned above with some Pd4S phase is located at the surface, whereas reduction at 350°C results in a largely pure Pd4S phase. Thermal treatments which produce a Pd4S surface display excellent catalytic properties. At complete acetylene conversion at 250°C, ethylene selectivites of 82.8% and 90.0% were obtained under non-competitive and competitive conditions, respectively. Beneficial catalytic properties arise from the uniformity of Pd sites due to the crystal structure of Pd4S along with electronic influences on the adsorption/desorption processes arising from sulfur neighbours. No indications of deactivation or obvious deposition of carbon were observed over Pd4S sample after 50 h on stream.

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Section: Introductionmentioning

confidence: 99%

Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation

Liu

McCue

Feng

et al. 2018

Journal of Catalysis

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“…[17] Isolated Pt and Au cations stabilized by -O bonds on various supports supplying vicinal -OH groups have been found to be highly active for the water-gas shift reaction. [21][22][23][24] PdAu bimetallics have been reported as selective hydrogenation catalysts in both gas-phase [25][26][27] and liquid-phase reactions. [28,29] These studies have focused on bimetallic nanoparticles supported on carbon, oxides or other supports.…”

Section: Introductionmentioning

confidence: 99%

Selective non-oxidative dehydrogenation of ethanol to acetaldehyde and hydrogen on highly dilute NiCu alloys

Shan

Janvelyan

et al. 2017

Applied Catalysis B: Environmental

133

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The non-oxidative dehydrogenation of ethanol to acetaldehyde has long been considered as an important method to produce acetaldehyde and clean hydrogen gas. Although monometallic Cu nanoparticles have high activity in the non-oxidative dehydrogenation of ethanol, they quickly deactivate due to sintering of Cu. Herein, we show that adding a small amount of Ni (Ni 0.01 Cu-Ni 0.001 Cu) into Cu to form highly dilute NiCu alloys dramatically increases the catalytic activity and increases their long-term stability. The kinetic studies show that the apparent activation energy decreases from ~70 kJ/mol over Cu to ~45 kJ/mol over the dilute NiCu alloys. The improved performance is observed both for nanoparticles and nanoporous NiCu alloys. The improvement in the long-term stability of the catalysts is attributed to the stabilization of Cu against sintering. Our characterization data show that Ni is atomically dispersed in Cu. The comparison of the catalytic performance of highly dilute alloy nanoparticles with nanoporous materials is useful to guide the design of novel mesoporous catalyst architectures for selective dehydrogenation reactions.

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“…On calcining the sample at 673 K, or pretreating it to remove polyvinylpyrrolidone, the selectivity remained the same. [128] The same research group had synthesized PdCu/Al 2 O 3 catalysts, and the selectivity obtained was only about 70%, even beyond 99% acetylene conversions (at 373 K). By increasing H 2 :acetylene ratio, the selectivity of greater than 80% could be obtained at 363 K. [93] The activity and selectivity of PdÀ Cu/Al 2 O 3 catalysts prepared by three different methods namely sequential impregnation (SI), co impregnation (CI), and colloidal preparation (CP), were compared.…”

Section: Hydrogenation Of Unsaturated Hydrocarbonsmentioning

confidence: 99%

Recent Advances in Hydrogenation Reactions Using Bimetallic Nanocatalysts: A Review

2021

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Hydrogenation reactions have been studied for many decades now and have developed from reactions that appear simple to now being recognized for their many complexities. These reactions are generally catalyzed using monometallic and more recently, with bimetallic nanocatalysts. Hydrogenation plays a vital role in food, chemical, petrochemical, pharmaceuticals, and dye industries to name a few. The hydrogenated products derived from several biomass-based compounds are potential fossil fuels. Such products when employed in daily life, can help conserve natural resources. While hydrogenation of alkynes and alkenes are among the simplest of hydrogenation reactions, the most extensive and elegant manifestation of this reaction is seen in polymerization. Polymers like polythene, polypropylene (plastic) have replaced materials like glass, stainless steel, etc., in making daily use items for the obvious advantages of the former. Purification of alkenes is achieved by partially hydrogenating the respective alkynes present in trace amounts. This serves as an important step in the polymerization process. The presence of nitro group on aromatic rings makes them carcinogenic in nature which harms living organisms. For a safe environment, the elimination or modification of this nitro group becomes imperative. The products of hydrogenation of nitroaromatics and amino aromatics form the basis of pharmaceuticals and dyestuffs. A plethora of bimetallic catalysts have been used to catalyze these hydrogenation reactions. These catalysts are evaluated based on their selectivity and efficiency. This review highlights the recent advancements in the field of hydrogenation of nitro compounds, carbonyl compounds, and unsaturated hydrocarbons catalyzed by bimetallic nanoparticles.

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Acetylene hydrogenation over structured Au–Pd catalysts

Cited by 33 publications

References 70 publications

Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation

Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation

Selective non-oxidative dehydrogenation of ethanol to acetaldehyde and hydrogen on highly dilute NiCu alloys

Recent Advances in Hydrogenation Reactions Using Bimetallic Nanocatalysts: A Review

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