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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Chemistry of sulfur oxides on transition metals. III. Oxidation of SO2 and self-diffusion of O, SO2, and SO3 on Pt(111)
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Chemistry of sulfur oxides on transition metals. III. Oxidation of SO2 and self-diffusion of O, SO2, and SO3 on Pt(111)

机译:过渡金属上的硫氧化物化学。三, SO2的氧化和O,SO2和SO3在Pt(111)上的自扩散

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摘要

The chemical kinetics of the Pt catalyzed oxidation reaction SO2(g) + 1/2O(2)(g) <---->(pt) SO3(g) are studied using first-principles density functional theory (DFT). The diffusion processes Of O, SO2, and SO3 are investigated in detail, revealing complex and unintuitive behavior. It is found that the self-diffusivities decrease in the order SO2, O, and SO3. For the formation Of SO3, both the Langmuir-Hinshelwood and the Eley-Rideal surface reaction steps are investigated in p(2x2) supercells, and the activation energies are found to be 46 and 25 kJ/mol, respectively. Both of these activation energies are much smaller than the SO3 desorption energy of 113 kJ/mol.
机译:使用第一原理密度泛函理论(DFT)研究了Pt催化氧化反应SO2(g)+ 1 / 2O(2)(g)<----> pt SO3(g)的化学动力学。详细研究了O,SO2和SO3的扩散过程,揭示了复杂且不直观的行为。发现自扩散系数按SO2,O和SO3的顺序降低。对于SO3的形成,在p(2x2)超级电池中研究了Langmuir-Hinshelwood和Eley-Rideal表面反应步骤,并发现活化能分别为46和25 kJ / mol。这两种活化能都比113 kJ / mol的SO3解吸能小得多。

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