Surface Characterization of Supported and Nonsupported Hydrogenation Catalysts

Schölten, J.J.F.; Pijpers, A. P.; Hustings, A. M. L.

doi:10.1080/01614948509342359

Cited by 267 publications

(96 citation statements)

References 77 publications

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“…The main argument to call this species chemisorbed rather than physisorbed is the higher energy of adsorption compared to condensation (∼20 and 8 kJ/mol, respectively). 1 However, no experimental evidence is given yet to decide upon the nature of the weakly adsorbed hydrogen. 8 In this paper, the nature of the Pt-H bond for both the weakly and the strongly adsorbed hydrogen is further investigated.…”

Section: Introductionmentioning

confidence: 99%

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The Nature of the Pt−H Bonding for Strongly and Weakly Bonded Hydrogen on Platinum. A XAFS Spectroscopy Study of the Pt−H Antibonding Shaperesonance and Pt−H EXAFS

2001

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A long-standing problem in the research of H 2 chemisorption on supported Pt catalysts is the unclarity about the difference in nature of the Pt-H bonding for weakly and strongly bonded hydrogen. On the basis of Pt-Pt EXAFS and a newly developed XANES analysis of the Pt L 2 and L 3 edges, it will be shown that both types of hydrogen are truly chemisorbed species. The EXAFS analysis shows a similar contraction of the Pt-Pt bond irrespective of the removal of weakly or strongly bound hydrogen, indicating a similar nature for both interactions. Moreover, the analysis of the L 2 and L 3 X-ray absorption edges shows unambiguously the presence of a Pt-H antibonding state for both the weakly and strongly bonded hydrogen. This is a clear indication for chemisorption of hydrogen for both types of hydrogen. The Pt-H EXAFS shows a smaller Pt-H bond length in the case of strongly adsorbed, which is in correlation with the expected strength of the Pt-H bond.

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Section: Introductionmentioning

confidence: 99%

“…1 Generally, two types of hydrogen are observed, weakly and strongly bonded to the metal. [2][3][4][5][6][7][8][9][10] Weakly (or reversibly) adsorbed hydrogen is defined as hydrogen, which can easily be desorbed, for example, by evacuating for 10 min at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Nature of the Pt−H Bonding for Strongly and Weakly Bonded Hydrogen on Platinum. A XAFS Spectroscopy Study of the Pt−H Antibonding Shaperesonance and Pt−H EXAFS

2001

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“…Namely that the metal dispersion of adsorbent-F is the worst. The adsorbent-N metal dispersion is the best and the metal dispersion of adsorbent-A is similar to that of adsorbent-N. Scholten researched the relationship between the metal dispersion and average particle sizes of several kinds of metals and the result are utilized here [19]. Thereafter, the value of corresponding metal dispersion of the as-prepared adsorbents are obtained and the result is also shown in Fig.…”

Section: Temmentioning

confidence: 99%

Effect of different precursor species on the metal dispersion of a Ni/γ-Al2O3 adsorbent for sulfur adsorption

2017

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Nickel adsorbents supported on the c-Al 2 O 3 with different nickel precursor species were prepared by the incipient impregnation method to investigate the influence of different precursor species on the metal dispersion and the sulfur capacity of the adsorbents. The adsorbents were characterized by N 2 adsorption-desorption, H 2 temperatureprogrammed reduction (TPR), transmission electron microscopy (TEM), O 2 -H 2 chemisorption, and FT-IR of adsorbed pyridine. The sulfur adsorption performance was investigated at ambient temperature and pressure. The results showed that adsorbent's metal dispersion and sulfur capacity were influenced significantly by the metal precursor species. The adsorbents prepared by nickel nitrate exhibited higher sulfur capacity and metal dispersion compared to the adsorbents prepared by nickel formate and nickel acetate. The higher performance of adsorbent prepared by nickel nitrate can be mainly attributed to the relatively more uniform metal dispersion and the smaller particle size of the nickel particles. This study demonstrates that the precursor species is an important factor for affecting the adsorption performance and provides a novel design idea of high metal dispersed catalysts.

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“…For spherical and hemispherical particles, the relation between the platinum particle diameter and the fraction of exposed platinum atoms is given by [34]:…”

Section: Co-pulse Chemisorptionmentioning

confidence: 99%

“…An amount of 100 mg was used for surface area determination in duplicate. The fraction of exposed platinum atoms was calculated assuming a 1:1 stoichiometry [34], leading to:…”

Section: Co-pulse Chemisorptionmentioning

confidence: 99%

On-line characterization of platinum/graphite catalysts during liquid phase oxidations using cyclic voltammetry

Bruijn

Kuster

Marin

1996

Applied Catalysis A: General

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Surface Characterization of Supported and Nonsupported Hydrogenation Catalysts

Cited by 267 publications

References 77 publications

The Nature of the Pt−H Bonding for Strongly and Weakly Bonded Hydrogen on Platinum. A XAFS Spectroscopy Study of the Pt−H Antibonding Shaperesonance and Pt−H EXAFS

The Nature of the Pt−H Bonding for Strongly and Weakly Bonded Hydrogen on Platinum. A XAFS Spectroscopy Study of the Pt−H Antibonding Shaperesonance and Pt−H EXAFS

Effect of different precursor species on the metal dispersion of a Ni/γ-Al2O3 adsorbent for sulfur adsorption

On-line characterization of platinum/graphite catalysts during liquid phase oxidations using cyclic voltammetry

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