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首页> 外文期刊>Catalysis science & technology >Identification of hydrogen species on Pt/Al2O3 by in situ inelastic neutron scattering and their reactivity with ethylene
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Identification of hydrogen species on Pt/Al2O3 by in situ inelastic neutron scattering and their reactivity with ethylene

机译：氢物种Pt /氧化铝的识别原位非弹性中子散射和他们与乙烯反应

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摘要

Hydrogen (H) species adsorbed on catalyst surfaces are key intermediates in catalytic hydrogenation reactions over supported metal catalysts. However, individual identification of H species on the metal catalysts has not been established to date. Here, we elucidated the H species on Pt/Al2O3 by the combination of in situ inelastic neutron scattering (INS) and density functional theory (DFT). Several H species in the presence of H-2 were successfully identified at different sites on the Pt surface and Al2O3 support. The in situ INS and FT-IR measurements revealed that the hydride/atop Pt-H, bridged perimeter/terrace Pt-H-Pt, and threefold Pt-3-H are active intermediates in the C2H4 hydrogenation reaction, whereas the edge Pt-H-Pt is a rather inert species. In addition, the in situ measurements indicate that the Al2O3 itself acts as hydrogen storage material by mediating AlO-H and Al-H-Al species, which serve H species in the C2H4 hydrogenation reaction.
机译：氢(H)在催化剂表面吸附物种关键中间体催化加氢吗反应在金属催化剂的支持。然而,个人H物种的识别金属催化剂上尚未建立到目前为止。Pt /氧化铝原位无弹性的结合中子散射(INS)和密度泛函理论(DFT)。2是成功地确定了在不同网站在Pt表面和氧化铝的支持。原地INS和傅立叶变换红外光谱测量显示氢化/ Pt-H之上,弥合周长/露台Pt-3-H Pt-H-Pt,三是活跃的C2H4加氢反应中间体,而边缘Pt-H-Pt是惰性物种。表明,氧化铝本身作为氢通过中介AlO-H和Al-H-Al存储材料物种,H物种C2H4服务加氢反应。

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