ChemInform Abstract: DEHYDROGENATION AND HYDROGENATION ACTIVITY OF PALLADIUM‐TIN‐SILICA AND NICKEL‐TIN‐SILICA

Masai, Mitsuo; Honda, Kunihiko; Kubota, Akinori; Ohnaka, Shinji; Nishikawa, Yutaka; Nakahara, Keiko; KISHI, K.; IKEDA, S.

doi:10.1002/chin.197813113

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…There may be also a possibility, however, that the results on the freeze-dried catalysts are caused by the coexistence of original elemental composition and colloidal particles. It was reported by Masai et al, (27) that the Pd 4d state peaks in the XPS spectra for the Pd-Sn alloy system are shifted to higher binding energies with decreasing ratio of Pd/Sn. (The shift of ca.…”

Section: Auger Electron Spectroscopy (Aes) and X-ray Photoelectron Sp...mentioning

confidence: 83%

A Study on Activation and Acceleration by Mixed PdCl2 / SnCl2 Catalysts for Electroless Metal Deposition

Osaka¹,

Takematsu²,

Nihei

1980

J. Electrochem. Soc.

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Five different compositions of mixed acidic PdCl2/SnCl2 catalysts for electroless plating were investigated mainly by electrochemical and x‐ray photoelectron spectroscopy measurements, and also by ultraviolet and visible photospectroscopy, transmission electron microscopy, and Auger electron spectroscopy. It is shown that the potential sweep technique using a catalyzed gold electrode in 1MnormalHCl yields voltammograms which depend upon the catalyst activity, and that this technique is applicable for simple diagnosis of the activity of mixed PdCl2/SnCl2 catalyst systems. It was found by transmission electron microscopy that large colloidal particles are required for high catalytic activities. X‐ray photoelectron spectroscopy showed that these colloidal particles consist of a system in which Pd and Sn atoms have an interaction such as in Pd‐Sn intermediates or alloys. The ratio of Pd/Sn after acceleration is not constant but depends on the catalyst activity. The accelerator ( 1MNH4BF4 or 1:1 normalHCl ) not only removes Sn(IV) ions from the substrate but also causes coagulation of small particles adsorbed on the substrate, and these actions result in a drastic increase in the activity of low activity catalysts.

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Section: Auger Electron Spectroscopy (Aes) and X-ray Photoelectron Sp...mentioning

confidence: 83%

A Study on Activation and Acceleration by Mixed PdCl2 / SnCl2 Catalysts for Electroless Metal Deposition

Osaka¹,

Takematsu²,

Nihei

1980

J. Electrochem. Soc.

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“…In contrast, there is evidence that incorporation of tin into either palladium or nickel decreased the hydrogenation activity of the group VIII metals. 43,44 It was suggested that this behavior was due to a suppression of the dissociative adsorption of hydrogen on the tin-modified metal surface. A study conducted in the controlled atmosphere electron microscope revealed the existence of an unusual type of bidirectional carbon filament growth when tin was added to iron and the bimetallic particles were heated in acetylene.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Carbon Filament Formation from the Interaction of Cobalt−Tin Particles with Ethylene

1998

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The effect of adding tin to a cobalt catalyst has been investigated using the decomposition of ethylene at 600 °C to form solid carbon, methane, and ethane as a probe reaction. These experiments have been carried out in a simple continuous flow system, where it was possible to monitor not only the gaseous product distribution but also the growth of filamentous carbon as a function of time. Particular attention was given to the modifications in the structural characteristics of the carbon filaments that accompanied the change in catalyst composition. These studies were performed using a combination of temperature-programmed oxidation, BET surface area measurements, and examination at high resolution in the transmission electron microscope. It was found that the introduction of as little as 0.5 wt % of tin into cobalt produced a dramatic increase in the catalytic activity of the bimetallic toward the formation of filamentous carbon. It is suggested that tin is responsible for inducing electronic perturbations in the surface of cobalt, and this phenomenon is reflected in a major change in the dissociative chemisorption behavior of ethylene on the mixed metal catalyst. Increasing the concentration level of tin did not lead to any further enhancement in the amount of carbon generated from the reaction; however, this procedure resulted in a significant increase in the rate of catalyst deactivation. It was also found that in the presence of tin the filamentous carbon structures acquired a high degree of crystalline order.

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ChemInform Abstract: DEHYDROGENATION AND HYDROGENATION ACTIVITY OF PALLADIUM‐TIN‐SILICA AND NICKEL‐TIN‐SILICA

Cited by 2 publications

References 1 publication

A Study on Activation and Acceleration by Mixed PdCl2 / SnCl2 Catalysts for Electroless Metal Deposition

A Study on Activation and Acceleration by Mixed PdCl2 / SnCl2 Catalysts for Electroless Metal Deposition

Characteristics of Carbon Filament Formation from the Interaction of Cobalt−Tin Particles with Ethylene

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