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decomposition of solids [ 1 , 3 – 5 ]. For many oxalates, the mechanism of thermal decomposition are well established and are commonly used as standard substances to confirm the exactness of theoretically developed models and equations of thermal decomposition

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Introduction The kinetics of thermal decomposition of several compounds of the general type have been previously studied using experimental techniques 1 – 4 ]. It has been shown that elimination of molecular hydrogen occurs

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-milling [ 9 ] or solid state reaction [ 6 ] and non-conventional ones like sol–gel [ 10 ], co-precipitation, auto-combustion [ 11 , 12 ] and thermal decomposition of polynuclear coordination compounds [ 13 ]. In this paper, we present a study on

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. Experimental The copper/zinc/zirconia/gallium catalyst used in these experiments was prepared in our laboratory using the thermal decomposition of citrates. Decomposing the citrate complexes of metals was performed according to the method described by

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alkyl; Me: Co or Ni; Me′: Mo or W] followed by thermal decomposition. However, for unsupported HDS catalysts, the morphologies and catalytic performances depend strongly on the experimental conditions [ 6 ]. The activation of Ni

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decomposition of the intermediates have not been reported in the open literature. In the present study, the kinetics of the thermal decomposition of ammonium yttrium fluoride intermediates, (NH 4 ) 3 Y 2 F 9 and NH 4 Y 2 F 7 were studied by non

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Viorel Chihaia, Karl Sohlberg, M. Scurtu, S. Mihaiu, M. Caldararu, and M. Zaharescu

after catalytic test. Conclusions Sn–Ce–O powders with the same nominal compositions (Sn 0.5 Ce 0.5 O 2 and Sn 0.2 Ce 0.8 O 2 ) were obtained by the thermal decomposition of tin(II) oxalate and cerium(IV) ammonium nitrate

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.W. McCabe D. Flath J. Grasmeder M. Percy 2010 Mechanism of thermal

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catalysts was monitored by the percentage weight loss in relation to the temperature from the range of 0–1,000 °C. The weight losses that were observed at temperatures below 600 °C can be attributed to the thermal decomposition of water, citrate precursor

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Abstract  

The reaction of urea with ZnO was investigated by FTIR and TPD. It was found that urea was thermally decomposed into isocyanic acid on ZnO, and the adsorbed isocyanic acid reacted with ZnO to form zinc isocyanate. Catalytic evaluation showed that ZnO had high activity towards urea methanolysis in a batch reactor, and zinc element and isocyanate were all detected in the product solution. Furthermore, the soluble zinc content was proportional to the DMC yield. Sample analyses suggested that the soluble zinc existed in the form of Zn(NCO)2(NH3)2, which originated from the reaction of ZnO with urea. It was the complex (not ZnO) that catalyzed the urea methanolysis. Based on these observations, a possible mechanism was suggested.

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