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Yasuaki Okamoto, Toshinori Adachi, Akinori Maezawa, Toshinobu Imanaka, Effect of ZnO Addition on Cobalt–Alumina Interaction Species, Bulletin of the Chemical Society of Japan, Volume 64, Issue 1, January 1991, Pages 236–242, https://doi.org/10.1246/bcsj.64.236
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Abstract
The effect of ZnO addition on cobalt–alumina interaction modes was studied using TPR and XPS. It was found that the addition of 2 wt% ZnO markedly affects the distribution of the cobalt species in CoO/Al2O3 (5 wt% CoO): cobalt–alumina surface interaction species are removed and migration of cobalt into an alumina subsurface phase is promoted by ZnO. A formation of Co–Zn–O mixed oxide is proposed for ZnO–CoO/Al2O2O3 at high ZnO content. The dispersion and distribution of ZnO on Al2O3 are also strongly modified by the presence of cobalt.