Abstract

Benzene-d6 adsorption and decomposition on Ni(100) has been studied with temperature programmed desorption and Auger electron spectroscopy. Decomposition in the neighborhood of 472 K produces C(a) and D2(g), and occurs with simultaneous benzene desorption at sufficiently large coverages. Low temperature TPD spectra of benzene from clean Ni(100) and from several precovered Ni(100) substrates were similar. The substrates included are oxygen-, hydrogen-, carbon monoxide-, and carbon-covered Ni(100). All of the coadsorbates except hydrogen completely inhibit benzene decomposition. Hydrogen presaturation of the Ni(100) surface greatly reduces benzene decomposition, and hydrogen either reacts with or is displaced by post-dosed benzene to a small extent. Isotopic labelling experiments on clean Ni(100) showed that low temperature desorption states can freely interconvert. Features of the desorption and decomposition of benzene near 472 K indicate the existence of a variety of adsorption sites with a distribution of benzene adsorption strengths and decomposition facilities. A qualitative model involving benzene adsorption with a variety of bonding energies is presented.

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