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1)相比Pt(111)表面,H原子更容易从Pd(111)表面进入其亚表层,而且从H原子从Pd(111)亚表层再返回到表面的能垒也高。neb计算结果认为在常温及氢压较高的情...
1) 相比Pt(111)表面,H原子更容易从Pd(111)表面进入其亚表层,而且从H原子从Pd(111)亚表层再返回到表面的能垒也高。neb计算结果认为在常温及氢压较高的情况下,Pd(111)和Pt(111)表面都可能存在亚表层H原子,但在Pd(111)可能性高很多。
2) 反式1,3-丁二烯和1-丁烯在Pt(111)和Pd(111)表面吸附能随覆盖度的增加而降低,其中在Pd(111)表面降低趋势更显著。 反式1,3-丁二烯和1-丁烯在Pt(111)和Pd(111)表面均可存在σ吸附和π吸附,反式1,3-丁二烯在两种金属表面的最稳定吸附均为4σ吸附模式,丁二烯在两种金属表面的最稳定吸附均为2σ吸附模式。
3) 反式1,3-丁二烯和丁烯吸附在Pt和Pd两种金属表面的几何结构参数表明其与Pt表面的结合距离更小,而在Pt表面的吸附能却要小。导致出现这一反常现象的原因是是金属Pt的原子间距比Pd的大, 吸附物分子在Pt表面的形变能更大。对吸附能进行分解后表明吸附物种与金属Pt表面的相互作用能更大。
4) 亚表层H原子增加了金属Pt和Pd表面的功函,因此降低了C4烯烃在两种金属表面的吸附能。
5) 亚表层H原子显著降低了1,3-丁二烯和1-丁烯与Pd金属表面的相互作用能和吸附能,导致1,3-丁二烯部分加氢产物1-丁烯容易从金属Pd表面脱附而不会被进一步加氢变成丁烷。PDOS分析证实了即使存在亚表层H原子,在金属1,3-丁二烯和1-丁烯与Pt表面的金属原子仍可以形成强化学键,使得加氢产物1-丁烯难以从Pt表面脱附。因此可以认为亚表层H原子是促使丁二烯加氢反应在Pt和Pd表面具有不同选择性的原因。 展开
2) 反式1,3-丁二烯和1-丁烯在Pt(111)和Pd(111)表面吸附能随覆盖度的增加而降低,其中在Pd(111)表面降低趋势更显著。 反式1,3-丁二烯和1-丁烯在Pt(111)和Pd(111)表面均可存在σ吸附和π吸附,反式1,3-丁二烯在两种金属表面的最稳定吸附均为4σ吸附模式,丁二烯在两种金属表面的最稳定吸附均为2σ吸附模式。
3) 反式1,3-丁二烯和丁烯吸附在Pt和Pd两种金属表面的几何结构参数表明其与Pt表面的结合距离更小,而在Pt表面的吸附能却要小。导致出现这一反常现象的原因是是金属Pt的原子间距比Pd的大, 吸附物分子在Pt表面的形变能更大。对吸附能进行分解后表明吸附物种与金属Pt表面的相互作用能更大。
4) 亚表层H原子增加了金属Pt和Pd表面的功函,因此降低了C4烯烃在两种金属表面的吸附能。
5) 亚表层H原子显著降低了1,3-丁二烯和1-丁烯与Pd金属表面的相互作用能和吸附能,导致1,3-丁二烯部分加氢产物1-丁烯容易从金属Pd表面脱附而不会被进一步加氢变成丁烷。PDOS分析证实了即使存在亚表层H原子,在金属1,3-丁二烯和1-丁烯与Pt表面的金属原子仍可以形成强化学键,使得加氢产物1-丁烯难以从Pt表面脱附。因此可以认为亚表层H原子是促使丁二烯加氢反应在Pt和Pd表面具有不同选择性的原因。 展开
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1) compared to Pt (111) surface, the H atoms are more easily from the Pd(111) surface into the sub surface, but also from H atoms from the Pd (111)sub surface and return to the surface of the barrier is high. The calculation result of NEB that pressure is higher in normal temperature and the absence of hydrogen, Pd (111) and Pt (111) surface may have a sub surface H atoms on Pd (111), but the more likely.
2) trans 1,3- butadiene and butene in 1- Pt (111) and Pd (111) surface adsorption energy increases coverage and reduces, in Pd (111) surfacereduces the tendency is more significant. Trans 1,3- butadiene and butenein 1- Pt (111) and Pd (111) surface adsorption and adsorption can besigma PI, trans 1,3- butadiene in two kinds of the metal surface of themost stable adsorption are 4 sigma adsorption model, the most stable adsorption in the two metal surfaces of butadiene were 2 sigma adsorption mode.
3) trans 1,3- butadiene and butene adsorption on Pt and Pd two kinds ofmetal surface geometric structure parameters show that the smaller thedistance and combined with the Pt surface, and the adsorption on Pt surface can be small. Causes of this abnormal phenomenon is of Pt metalatom distance is bigger than Pd, the adsorption of molecules on the Ptsurface deformation can be a greater. On the adsorption decompositionshows that interaction of adsorbed species and the metal Pt surface canmore.
4) sub surface H atoms increases the metal Pt and Pd surface work function, thus reducing the C4 olefin in the adsorption of two kinds ofmetal surface can.
5) sub surface H atoms significantly reduces the interaction of 1,3- and 1- butene and butadiene Pd surface energy and adsorption energy, leading to 1,3- butadiene partial hydrogenation product 1- butene easily from themetal Pd surface desorption and will not be further hydrogenated tobutane. PDOS analysis confirmed that even in the presence of subsurfaceH atoms in metals, metal atoms 1,3- butadiene and butene and 1- Pt surface still can form strong chemical bond, which makes the product of hydrogenation of 1- butene to desorbing from the Pt surface. So that thesub surface H atoms is prompted butadiene hydrogenation reaction with different selectivity in the Pt and Pd surfaces.
2) trans 1,3- butadiene and butene in 1- Pt (111) and Pd (111) surface adsorption energy increases coverage and reduces, in Pd (111) surfacereduces the tendency is more significant. Trans 1,3- butadiene and butenein 1- Pt (111) and Pd (111) surface adsorption and adsorption can besigma PI, trans 1,3- butadiene in two kinds of the metal surface of themost stable adsorption are 4 sigma adsorption model, the most stable adsorption in the two metal surfaces of butadiene were 2 sigma adsorption mode.
3) trans 1,3- butadiene and butene adsorption on Pt and Pd two kinds ofmetal surface geometric structure parameters show that the smaller thedistance and combined with the Pt surface, and the adsorption on Pt surface can be small. Causes of this abnormal phenomenon is of Pt metalatom distance is bigger than Pd, the adsorption of molecules on the Ptsurface deformation can be a greater. On the adsorption decompositionshows that interaction of adsorbed species and the metal Pt surface canmore.
4) sub surface H atoms increases the metal Pt and Pd surface work function, thus reducing the C4 olefin in the adsorption of two kinds ofmetal surface can.
5) sub surface H atoms significantly reduces the interaction of 1,3- and 1- butene and butadiene Pd surface energy and adsorption energy, leading to 1,3- butadiene partial hydrogenation product 1- butene easily from themetal Pd surface desorption and will not be further hydrogenated tobutane. PDOS analysis confirmed that even in the presence of subsurfaceH atoms in metals, metal atoms 1,3- butadiene and butene and 1- Pt surface still can form strong chemical bond, which makes the product of hydrogenation of 1- butene to desorbing from the Pt surface. So that thesub surface H atoms is prompted butadiene hydrogenation reaction with different selectivity in the Pt and Pd surfaces.
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