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Huang, Dengpo; Chang, Ki‐Hong; Pong, W.; Tseng, P. K.; Hung, K.J.; Huang, Wei

doi:10.1023/a:1019022326090

Cited by 114 publications

(64 citation statements)

References 11 publications

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“…Aiming at the development of more stable and more selective catalysts the alloying of Pd with different metals, Ag [67], Sn [68], Au [69] or Ni [70] has been described. Industrial catalysts for the semi-hydrogenation of acetylene are based on Pd-Ag alloys with improved catalytic properties [7].…”

Section: Increased Selectivity and Stability Of Pdga And Pd 3 Gamentioning

confidence: 99%

Palladium–gallium intermetallic compounds for the selective hydrogenation of acetylenePart II: Surface characterization and catalytic performance

Osswald

Kovnir

Armbrüster

et al. 2008

Journal of Catalysis

312

234

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The structurally well-defined intermetallic compounds PdGa and Pd 3 Ga 7 constitute suitable catalysts for the selective hydrogenation of acetylene. The surface properties of PdGa and Pd 3 Ga 7 were characterized by X-ray photoelectron spectroscopy, ion scattering spectroscopy and CO chemisorption. Catalytic activity, selectivity and long-term stability of PdGa and Pd 3 Ga 7 were investigated under different acetylene hydrogenation reaction conditions, in absence and in excess of ethylene, in temperature-programmed and isothermal long-term experiments. Chemical treatment with ammonia solution -performed to remove the gallium oxide layer introduced during the milling procedure from the surface of the intermetallic compounds -yielded a significant increase in activity. Compared to Pd/Al 2 O 3 and Pd 20 Ag 80 reference catalysts, PdGa and Pd 3 Ga 7 exhibited a similar activity per surface area, but higher selectivity and stability. The superior catalytic properties are attributed to the isolation of active Pd sites in the crystallographic structure of PdGa and Pd 3 Ga 7 according to the active-site isolation concept.

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Section: Increased Selectivity and Stability Of Pdga And Pd 3 Gamentioning

confidence: 99%

Palladium–gallium intermetallic compounds for the selective hydrogenation of acetylenePart II: Surface characterization and catalytic performance

Osswald

Kovnir

Armbrüster

et al. 2008

Journal of Catalysis

312

234

View full text Add to dashboard Cite

show abstract

“…The bimetallic Pd-Ag catalyst has been reported to show many beneficial effects in selective hydrogenation of acetylene to ethylene, for examples, suppression of oligomers formation and improvement of ethylene selectivity [20]. These beneficial effects are due to the altered surface arrangement of Ag atoms on the Pd surface.…”

Section: Characteristics Of Pd/tio 2 and Pd-ag/tio 2 Catalystsmentioning

confidence: 99%

Synthesis, Characterization, and Catalytic Properties of Pd and Pd–Ag Catalysts Supported on Nanocrystalline TiO2 Prepared by the Solvothermal Method

Panpranot

Nakkararuang

Ngamsom³

et al. 2005

Catal Lett

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Nanocrystalline titania have been prepared by thermal decomposition of titanium (IV) n-butoxide in two different solvents (toluene and 1,4-butanediol) at 320°C and employed as supports for Pd and Pd-Ag catalysts for selective acetylene hydrogenation for the first time. The titania products obtained from both solvents were pure anatase phase with relatively the same crystallite sizes and BET surface areas. However, due to different crystallization pathways, the number of Ti 3+ defective sites as shown by ESR results of the titania prepared in toluene was much higher than the ones prepared in 1,4-butanediol. It was found that the use of anatase titania with higher defective sites as a support for Pd catalysts resulted in lower activity and selectivity in selective acetylene hydrogenation. However, this effect was suppressed by Ag promotion.

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“…So far, it is generally recognized that the electronic and morphological properties of the Pd particles play a dominant role in its catalytic performance [8,9]. Based on this account, several strategies for tuning the electronic and/or morphological properties of Pd-based catalyst by incorporating a second metal such as Au, Ag, Cu and alkali metals [7,[10][11][12], decorating Pd particles with Si [13], pre-treatment with oxygen-containing compounds [14,15], modifying the supports with transition-metal oxides [16] or by selectively poisoning active Pd sites with CO [6,17] have been used to improve their selectivity. Although some of these measures are effective to improve the selectivity of ethylene (S E ), to the best of our knowledge, the ethylene selectivity usually decreases with the increase of acetylene conversion, especially at nearly 100% acetylene conversion and the high molar ratio of H 2 /C 2 H 2 .…”

Section: Introductionmentioning

confidence: 99%

Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

Wang

Chen

et al. 2008

Catal Lett

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A novel Pd-based catalyst, small Pd nanoparticles (1-2 nm) fabricated on N,O-containing organic groups modified silica, exhibits unusual catalytic performance for selective hydrogenation of acetylene, that is, the ethylene selectivity rises significantly with the increase of acetylene conversion regardless of the variation of reaction temperature or hydrogen partial pressure until 100% acetylene conversion. The in situ DRIFTS spectra of CO adsorption show that the organic groups presented on the silica affect the electronic property of the very small Pd nanoparticles.

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Untitled

Cited by 114 publications

References 11 publications

Palladium–gallium intermetallic compounds for the selective hydrogenation of acetylenePart II: Surface characterization and catalytic performance

Palladium–gallium intermetallic compounds for the selective hydrogenation of acetylenePart II: Surface characterization and catalytic performance

Synthesis, Characterization, and Catalytic Properties of Pd and Pd–Ag Catalysts Supported on Nanocrystalline TiO2 Prepared by the Solvothermal Method

Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

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