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Chrissafis K. Efthimiadis K. G. Polychroniadis E. K. Chadjivasiliou S. C. 《Journal of Thermal Analysis and Calorimetry》2003,72(3):761-767
The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (TM»620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell). The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (Edes»240 kJ mol-1, A»1011 s-1). 相似文献
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K. G. Efthimiadis G. Stergioudis S. C. Chadjivasiliou I. A. Tsoukalas 《Crystal Research and Technology》2002,37(8):827-833
Experimental results are presented regarding the variation of the atomic magnetic moment, the Curie temperature and the crystallization temperature of Fe78‐cMcSi9B13 (M = V, Nb, Mo) and Fe75‐cMcSi9B16 (M = Ni, Cu, Pd, Ag) amorphous alloys. Efforts were made to explain qualitatively the phenomena, based on the behavior of the amorphous alloys when various admixtures substitute Fe atoms. 相似文献
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