Effect of gamma-irradiation on catalytic activity and selectivity of CuO-Al2O3 solids

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 DOI:10.1016/1359-0197(92)90226-6

A.M. Youssef, S.A. El-Hakam, G.A. El-Shobaky

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引用次数: 3

Abstract

CuO-Al₂O₃ catalyst containing 16.2 wt% CuO, precalcined at 300°C was subjected to different doses of γ-rays ranging between 20 and 160 Mrad. The magnetic properties were measured by the Gouy method and the catalytic activity and selectivity towards isopropanol conversion were investigated using a microcatalytic pulse technique at temperatures between 260–300°C.

The CuO-Al₂O₃ system exhibited a lower paramagnetic moment compared to that of unloaded CuO. γ-Irradiation induced changes in the magnetic properties of the system. The presence of diamagnetic alumina as a support and its dehydroxylation with γ-rays contributed to the observed changes in the magnetic properties.

Loading of CuO on alumina decreased the dehydration activity which disappeared completely at 16.2 wt% CuO. γ-Irradiation resulted in a progressive decrease in the dehydrogenation activity falling to a minimum at a dose of 40 Mrad. At greater doses the activity increased with the increase of the irradiation dose. Unirradiated and 160 Mrad-irradiated samples measured more or less the same dehydrogenation activity.

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γ辐照对CuO-Al2O3固体催化活性和选择性的影响

在300℃下预煅烧的CuO- al2o3催化剂含有16.2 wt%的CuO，对其进行了20 ~ 160 Mrad不同剂量的γ射线照射。采用Gouy法测定了其磁性能，并采用微催化脉冲技术在260 ~ 300℃范围内研究了其对异丙醇转化的催化活性和选择性。与未加载CuO相比，CuO- al2o3体系的顺磁矩更小。γ-辐照引起了体系磁性能的变化。抗磁性氧化铝作为载体的存在及其在γ射线下的脱羟基作用导致了磁性能的变化。CuO在氧化铝上的负载降低了氧化铝的脱水活性，在16.2 wt% CuO时脱水活性完全消失。γ-辐照导致脱氢活性逐渐下降，在剂量为40 Mrad时降至最低。在较大剂量下，活性随着照射剂量的增加而增加。未辐照和160 mrad辐照样品的脱氢活性或多或少相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

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