γ辐照和锂掺杂对镍铝混合氧化物催化活性的影响

G.A. El-Shobaky, A.N. Al-Noaimi, A.M. Dessouki
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引用次数: 36

摘要

采用CO在不同温度下与O2氧化的方法,研究了不同剂量γ辐照下纯NiO和Ni-Al混合氧化物的催化活性。研究了锂掺杂对Ni-Al催化活性的影响。结果表明,当剂量达到10 Mrad时,纯NiO的催化活性下降了45%,当剂量增加到20 Mrad时,催化活性略有变化。用γ辐照对镍铝混合氧化物的活性进行了较为复杂的改性。5 - 10 Mrad的剂量使其催化活性增加34%,15 Mrad的剂量使其活性急剧下降57%。增加20mrad的剂量,混合氧化物固体的催化活性略有增加。γ辐照引起的纯NiO和混合氧化物固体催化活性的变化归因于纯NiO的化学吸附O2的诱导去除,以及混合氧化物催化剂的[Ni]/[Al]比率的可能增加,特别是在最外层。研究发现,锂掺杂导致Ni-Al混合氧化物的催化活性显著提高,这是由于化学吸附O2量的增加和[Ni]/[Al]比的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of γ irradiation and lithium doping on the catalytic activity of nickel-aluminum mixed oxides

The catalytic activity of pure NiO and Ni-Al mixed oxides subjected to various doses of γ irradiation was investigated using the oxidation of CO with O2 at various temperatures. The effect of lithium doping on the catalytic activity of Ni-Al was also investigated. The results obtained revealed that γ irradiation of pure NiO using doses up to 10 Mrad effected a decrease of 45% in its catalytic activity which suffered a further slight change when the dose was increased to 20 Mrad. The activity of Ni-Al mixed oxide was modified in a somewhat complicated manner by γ irradiation. Doses of 5 – 10 Mrad produced an increase of 34% in its catalytic activity and a dose of 15 Mrad caused a drastic decrease in its activity of 57%. Increasing the dose of 20 Mrad produced a slight increase in the catalytic activity of the mixed oxide solid.

The modifications in the catalytic activity of pure NiO and mixed oxide solids arising from γ irradiation were attributed to an induced removal of chemisorbed O2 in the case of pure NiO and to a possible increase in the [Ni]/[Al] ratio, especially in the outermost surface layers, of the mixed oxide catalyst.

Lithium doping was found to cause a significant increase in the catalytic activity of Ni-Al mixed oxide which was attributed to the increase in the amount of chemisorbed O2 and to an increase in the [Ni]/[Al] ratio.

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