Platinum and palladium addition to supported rhodium catalysts for automotive emission control

Schlatter, James C.

doi:10.1016/0021-9517(77)90238-x

Cited by 98 publications

(14 citation statements)

References 7 publications

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“…For the CO-NO-02 system, using an iridium catalyst, Tauster and Murrell (1976) found that under net oxidizing conditions, conversion of N O becomes independent of catalyst loading, and pointed out that this metal concentration-invariant behavior should apply to any catalyst provided that temperature or contact time were high enough for essentially complete CO conversion. Schlatter and Taylor (1977) also observed similar behavior using a rhodium catalyst. The former authors have a l s o attempted to explain this behavior using approximate and numerical approaches (Tauster and Murrell, 1978).…”

Section: Introductionsupporting

confidence: 53%

A scaled particle theory of aqueous and nonaqueous solutions

Pierotti¹

1976

Chem. Rev.

1,264

925

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Section: Introductionsupporting

confidence: 53%

A scaled particle theory of aqueous and nonaqueous solutions

Pierotti¹

1976

Chem. Rev.

1,264

925

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“…Rhodium is a good catalyst for the synthesis of hydrocarbons and oxygenated compounds [1,2], and is also one of the main components of the catalyst for automobile exhaust gas cleaning [3].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of carbidic carbon on a rhodium surface

et al. 1994

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Different mechanisms of atomic carbon and oxygen recombination on a rhodium surface are studied with Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). The kinetics of adsorbed carbidic carbon oxidation (carbon coverage 0c ~ 0.1-0.3 ML) by gas-phase oxygen that proceeds by a Langmuir-Hinshelwood reaction mechanism, provides the value of the activation energy for recombination (Ea: t g 170 -4-20 kJ/mol). Erae et depends slightly on the carbon coverage. An Eley-Rideal type of reaction was observed for adsorbed oxygen and atomic gas-phase carbon recombination which occurs in a dynamic regime. The low value found for the activation energy (near zero) is consistent with the mechanism that this exothermic reaction is too fast for energy dissipation into the substrate; the energy is mainly transferred into translational, vibrational and rotational energy of CO.

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“…Both of these undesired activities can be circumvented by depositing the metals on separate support beads. By placing Rh catalyst in front of the catalyst bed followed by a second layer of catalyst containing Pt or Pd, enhanced oxidation activity of the two-metal combination was observed without sacrificing selectivity or activity for NO reduction (Schlatter and Taylor, 1977). Ammonia formation is also substantially lower for the case of separate beads.…”

Section: Rh/pt and Rh/pd Catalystsmentioning

confidence: 97%