The mechanism of thermal decomposition of Co(NO3)2 9 2H20 was found to involve stages in which Co(NO3) 3 and C0203" H20 are formed both of which decompose to C0304. During the process, the total cobalt enters the + 3 oxidation state, which is consistent with the results reported by Mehandjiev [2].The thermal decomposition of Co(NO3) 2 "2H20 is a characteristic heterogeneous reaction of the type: solid --,solid + gas, which can be written as Co(NO3)2"nn20 = C0304+(N2, NO2, NO, 02, H20 )The formulae in brackets on the right-hand side of this equation merely specify the gases evolved, without any details concerning their quantities. Their relative proportions in the gaseous products of decomposition depend on the conditions under which the reaction is carried out. A detailed thermal decomposition mechanism for C0(NO3)2 and its hydrates has not yet been reported. It is generally assumed that the decomposition of Co(NO3) 2 hydrates involves a dehydration stage, followed by decomposition of an anhydrous compound to C0304. It has also been found that the decomposition of anhydrous Co(NO3) 2 proceeds in stages. Thermogravimetric studies have shown that the dehydration of C0(NO3)2" 6H20 proceeds in stages through the tetrahydrate, bihydrate and monohydrate, and leads to the anhydrous salt [1].While measuring the effective magnetic moment (#) of the Co 2 § ions during the process of decomposition, Mehandjiev [2] found a minimum in # at a degree of decomposition equal to 0.9 (Fig. 1). This means that the content of Co 2 + ions in the sample at this moment is lower than that in C0304, which is the final product of decomposition. This result suggests the formation of intermediate phases duringJohn Wiley & Sons, Limited, Chichester Akaddmiai Kiad6, Budapest
TiO2‐Proben mit definiertem Reduktionsgrad (T102 ‐x; x: 0,003 ‐0,04) werden nach unterschiedlichen Methoden dargestellt (aus TiOg und Ti sowie durch Zersetzung von Ti‐Isoalkoholaten) und ihre katalytische Aktivität bei der Oxidation von CO zu CO2 untersucht (kinetische Messungen im Temperaturbereich 350‐500°C).
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