Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

McCue, Alan J.; McRitchie, Callum J.; Shepherd, Ashley M.; Anderson, James A.

doi:10.1016/j.jcat.2014.08.016

Cited by 173 publications

(155 citation statements)

References 66 publications

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“…10). This represented a 50 K decrease in the temperature necessary to achieve full conversion over monometallic Cu under the same conditions suggesting that this catalyst could operate within the temperature range currently used industrially [62]. Interestingly the same catalyst exhibited enhanced activity and selectivity when reaction was performed with 10 equivalents of H 2 relative to acetylene.…”

Section: Use Of Pd To Enhance Activity Of Other Metalsmentioning

confidence: 83%

“…A subsequent study by McCue et al applied this methodology to more traditional powdered catalysts by adding small amounts of Pd (10, 25, 50, 75 and 100 : 1, Cu : Pd atomic ratio) to 10 wt-% Cu/Al 2 O 3 using sequential impregnation (i.e., Pd added after Cu) [62]. Catalyst testing was, in the first instance, performed under non-competitive conditions and results indicated that sample with a nominal 50 : 1 Cu : Pd ratio appeared to offer activity/selectivity which combined the desirable features of both monometallic Cu and Pd catalysts.…”

Section: Use Of Pd To Enhance Activity Of Other Metalsmentioning

confidence: 99%

“…Characterisation data suggested the catalyst possessed a copper rich surface with Pd surface concentration so low that it was difficult to access the nature of the Pd surface species [62]. As such, it was not possible to identify if the Pd site responsible for hydrogen dissociation was .…”

Section: Use Of Pd To Enhance Activity Of Other Metalsmentioning

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: Use Of Pd To Enhance Activity Of Other Metalsmentioning

confidence: 83%

Section: Use Of Pd To Enhance Activity Of Other Metalsmentioning

confidence: 99%

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Recent advances in selective acetylene hydrogenation using palladium containing catalysts

McCue

Anderson

2015

Front. Chem. Sci. Eng.

Self Cite

229

196

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“…In recent reports, the preparation of bimetallic CuPd catalysts and their application for selective acetylene hydrogenation have been described [21,22]. This reaction is of industrial importance since it is a vital step in the purification of C2 streams produced from naphtha crackers [23,24].…”

Section: Introductionmentioning

confidence: 99%

CO induced surface segregation as a means of improving surface composition and enhancing performance of CuPd bimetallic catalysts

McCue

Anderson

2015

Journal of Catalysis

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a b s t r a c tA series of copper rich CuPd/Al 2 O 3 catalysts were prepared and characterised by FTIR spectroscopy using CO as a probe molecule. After reduction, the surface composition was largely composed of Cu with evidence of a small concentration of isolated Pd atoms. It was found that CO induced surface segregation could be used to increase the surface Pd concentration and depending on the Cu:Pd ratio, the formation of Pd-Pd dimers was possible. Changes in surface composition were quantified and correlated with catalyst activity and selectivity for selective acetylene hydrogenation. For the catalyst with optimum Cu:Pd ratio (50:1), it was possible to use CO induced segregation to increase activity considerably (20 K temperature reduction to achieve 100% conversion) whilst only marginally affecting ethylene selectivity (%5% decrease in ethylene selectivity). An estimate of the detection limit by FTIR of the minimum surface coverage of isolated Pd and Pd-Pd dimers is given.

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“…High conversion of acetylene (>99%) and selectivity to ethylene (>70%-80%) are achieved over Cu/Al2O3 catalysts modified with different Cu:Pd ratios at the temperature range of 90-100 °C [251]. With gold-based catalyst close to 100% selectivity for hydrogenation of acetylene to ethylene at temperature up to 300 °C is achievable [248].…”

Section: Potential Existing Technologies and New Considerations For Vmentioning

confidence: 99%

Utilization of Volatile Organic Compounds as an Alternative for Destructive Abatement

et al. 2015

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Abstract:The treatment of volatile organic compounds (VOC) emissions is a necessity of today. The catalytic treatment has already proven to be environmentally and economically sound technology for the total oxidation of the VOCs. However, in certain cases, it may also become economical to utilize these emissions in some profitable way. Currently, the most common way to utilize the VOC emissions is their use in energy production. However, interesting possibilities are arising from the usage of VOCs in hydrogen and syngas production. Production of chemicals from VOC emissions is still mainly at the research stage. However, few commercial examples exist. This review will summarize the commercially existing VOC utilization possibilities, present the utilization applications that are in the research stage and introduce some novel ideas related to the catalytic utilization possibilities of the VOC emissions. In general, there exist a vast number of possibilities for VOC OPEN ACCESSCatalysts 2015, 5 1093 utilization via different catalytic processes, which creates also a good research potential for the future.

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Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

Cited by 173 publications

References 66 publications

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

CO induced surface segregation as a means of improving surface composition and enhancing performance of CuPd bimetallic catalysts

Utilization of Volatile Organic Compounds as an Alternative for Destructive Abatement

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