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Summary

Upgrading of the efficiency of industrial power-production systems and environmental aspects, e.g. reduction of emission of greenhouse gases, is of particular interest to the Polish power sector, inherently depending on its own coal resources and coal processing technologies. Some information on fuel suitability for particular processing technology can be obtained from its reactivity. In this paper a procedure for testing coal chars reactivity, and the results obtained, in the process of steam gasification of coal in a laboratory-scale fixed-bed reactor are presented. The procedure is based on gas chromatographic analysis of a synthesis gas produced in the process. Chemometric methods (for example as hierarchical clustering) enabled discovery of the similarities and dissimilarities of coal samples and investigation of the relationships between the reactivity of coal chars and selected physical and chemical properties important in the steam gasification process.

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Abstract  

The reactivity of iron(III) orthovanadate(V) towards zinc divanadate(V) in the solid state was investigated over the whole component concentration range. On the base of DTA and XRD measurements the phase diagram of the FeVO4-Zn2V2O7 system in the subsolidus area was constructed for the whole component concentration range.

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References 1 Center for Chemical Process Safety 1995 Guidelines for Chemical Reactivity Evaluation and Application to Process Design

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Abstract  

The mutual reactivity in mixtures containing Nasicon (Na3Zr2Si2PO12) or YSZ (ZrO2:Y2O3) solid electrolytes with Li2CO3 or Li2CO3:BaCO3 sensing electrode materials was investigated using simultaneous DTA and TG and ex situ XRD techniques. The uncontrolled chemical reaction is suspected to be responsible for the instability of electrochemical gas sensors constructed from these materials. DTA and TG results obtained for Nasicon-carbonate mixtures indicate the possibility of reaction in the temperature range from about 470 to 650C, which overlaps the sensor operating temperature range (300–525C). The results obtained for YSZ-carbonate mixtures indicate that reaction between carbonate and the ZrO2 takes place at higher temperatures and cannot explain the instability drift of investigated sensors. The mechanism of observed reactions in systems studied is also discussed.

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., Tiilikainen, A.: HLA antigen 27 and reactive arthritis. A study of Yersinia arthritis and Reiter's disease. Lancet ii, 157 (1973). HLA antigen 27 and reactive arthritis. A study of Yersinia arthritis and Reiter's disease

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Journal of Behavioral Addictions
Authors: Katrin Starcke, Berenike Schlereth, Debora Domass, Tobias Schöler, and Matthias Brand

. B. L. Carter S. T. Tiffany 1999 Meta-analysis of cue-reactivity in addiction research Addiction 94

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Thermogravimetric analysis on gasification reactivity of Hailar lignite

Influence of inherent mineral matters and external ash

Journal of Thermal Analysis and Calorimetry
Authors: Ao Hou, Ze Wang, Wenli Song, and Weigang Lin

rate in CO 2 atmospheres. Köpsel and Zabawski [ 7 , 8 ] found that the inherent mineral matters had some catalytic effects on the demineralized coal gasification. Otto et al. [ 9 ] found that ash from reactive coals can significantly enhance the

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Abstract  

The use of XRD and DTA methods has allowed studies on the interaction of the SbVO5 and MoO3, taking place in the solid state and in the medium of ambient air. The experimental results of XRD and DTA for all the samples showed the presence of a novel phase, i.e. Sb3V2Mo3O21 apart from various amounts of MoO3 and V9Mo6O40 or SbVO5 and V2O5(s.s.). The SbVO5–MoO3 system is not a real two-component system over the entire range of component concentrations up to the solidus line.

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Abstract  

A review of studies of reactivities of solids is presented, concentrating on localization and autolocalization phenomena. Some examples of feed-back and structure of the reaction zone are given.

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