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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Vibrational and thermodynamic properties of Ar, N-2, O-2, H-2 and CO adsorbed and condensed into (H,Na)-Y zeolite cages as studied by variable temperature IR spectroscopy
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Vibrational and thermodynamic properties of Ar, N-2, O-2, H-2 and CO adsorbed and condensed into (H,Na)-Y zeolite cages as studied by variable temperature IR spectroscopy

机译：可变温度红外光谱研究吸附和冷凝（H，Na）-Y沸石笼中的Ar，N-2，O-2，H-2和CO的振动和热力学性质

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摘要

The adsorption of Ar, H-2 O-2, N-2 and CO on (H,Na)-Y zeolite (Si/Al 2.9, H+/Na+ approximate to 5) has been studied at variable-temperature (90-20 K) and sub-atmospheric pressure (0-40 mbar) by FTIR spectroscopy. Unprecedented filling conditions of the zeolite cavities were attained, which allowed the investigation of very weakly adsorbed species and of condensed, liquid-like or solid-like, phases. Two pressure regimes were singled out, characterized by: (i) specific interaction at low pressure of the probe molecules (P) with the internal Bronsted and Lewis sites, and (ii) multilayer adsorption at higher pressure. In the case of CO the perturbation of the protonic sites located inside the socialite cages was also observed. As the molecule is too large to penetrate the sodalite cage, the perturbation is thought to involve a proton jump tunneling mechanism. The adsorption energy for the (HF)(OHP)-P-... (P = Ar, H-2, O-2, N-2 and CO) specific interaction involving the high frequency Bronsted acid sites exposed in the supercages was derived following the VTIR (variable temperature infrared spectroscopy) method described by E. Garrone and C. Otero Arean.
机译：研究了在可变温度（90-20）下（H / Na）-Y沸石（Si / Al 2.9，H + / Na +大约为5）对Ar，H-2 O-2，N-2和CO的吸附。 K）和FTIR光谱测定低于大气压（0-40 mbar）。达到了前所未有的沸石型腔填充条件，从而可以研究极弱吸附的物质以及冷凝的，类似液体或类似固体的相。提出了两种压力方案，其特征在于：（i）探针分子在低压下（P）与内部布朗斯台德和路易斯位点的特异性相互作用，以及（ii）在高压下的多层吸附。在CO的情况下，还观察到位于名媛笼内的质子位点的扰动。由于分子太大而无法穿透方钠石笼，因此认为微扰涉及质子跳跃隧穿机制。 （HF）（OHP）-P -...（P = Ar，H-2，O-2，N-2和CO）特定相互作用的吸附能涉及在超笼中暴露的高频布朗斯台德酸位衍生自E. Garrone和C. Otero Arean所描述的VTIR（可变温度红外光谱法）方法。

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