Carbon incorporation in Pd(111) by adsorption and dehydrogenation of ethene

The Journal of Physical Chemistry. B
Harald GabaschRobert Schlögl

Abstract

The decomposition of ethene on the Pd(111) surface was studied at effective pressures in the 10(-8) to 10(-7) mbar range and at sample temperatures between 300 and 700 K, using an effusive capillary array beam doser for directional adsorption, LEED, AES, temperature programmed reaction, and TDS. In the temperature range of 350-440 K increasingly stronger dehydrogenation of the ethene molecule is observed. Whereas at 350 K an ethylidyne adlayer is still present after adsorption, already at temperatures around 440 K complete coverage of the surface by carbon is attained, while the bulk still retains the properties of pure Pd. Beyond 440 K a steady-state surface C coverage is established, which decreases with temperature and is determined by detailed balancing between the ethene gas-phase adsorption rate and the migration rate of carbon into the Pd bulk. This process gives rise to the formation of a "partially carbon-covered Pd(x)C(y) surface". Above 540 K the surface-bulk diffusion of adsorbed carbon becomes fast, and in the UHV experiment the ethene adsorption rate becomes limited by the ethene gas-phase supply. The carbon bulk migration rate and the steady-state carbon surface coverage were determined as a function of the sampl...Continue Reading

References

Nov 26, 2004·Journal of the American Chemical Society·Dario StacchiolaWilfred T Tysoe
Jul 21, 2006·The Journal of Physical Chemistry. B·Michael BowkerAlexander MacDowall
Jul 21, 2006·The Journal of Physical Chemistry. B·Marta BorasioHans-Joachim Freund

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Citations

Jul 7, 2007·Physical Chemistry Chemical Physics : PCCP·Konstantin M NeymanNotker Rösch
Dec 23, 2015·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Raffael RameshanSimon Penner
Nov 28, 2012·Chemistry : a European Journal·Hristiyan A AleksandrovKonstantin M Neyman
Jul 6, 2017·The Journal of Physical Chemistry. B·Esin SoyMichael Trenary
Sep 27, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Vladimir V VoroninValentine P Ananikov
Jan 5, 2021·Physical Chemistry Chemical Physics : PCCP·Ralf SchusterJörg Libuda

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