化学
一氧化碳
无机化学
沸石
吸附
铜
氨
氧气
催化作用
方解石
有机化学
标识
DOI:10.1016/0021-9517(73)90065-1
摘要
Copper(I) Y zeolites can be prepared by treating copper(II) Y with carbon monoxide. The reduction process is enhanced by the presence of a small amount of ammonia. Carbon monoxide is selectively adsorbed in Cu(I)Y zeolites, the uptake being about one CO per Cu+ ion below 100 °C and at 100 Torr. The specific Cu+CO interaction is revealed by a strong infrared absorption band at 2160 cm− and a heat of adsorption of 14.7 kcal/mole. Diffusion of carbon monoxide into sodalite cages occurs at temperatures below 100 °C. Adsorption is much smaller for carbon dioxide, nitrogen or oxygen. Cuprous ions in Y zeolite do not interact with oxygen at room temperature, but they are oxidized readily if ammonia is preadsorbed. Measurements of ammonia, adsorption show that the cuprous-ammine complexes in Y zeolite are mainly Cu(NH3)2+. At sufficiently low coverages, the isosteric heat of ammonia adsorption is 19 kcal/mole.
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