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On the interpretation of temperature programmed reduction patterns of transition metals sulphides

Paper ID Volume ID Publish Year Pages File Format Full-Text
44538 46038 2006 6 PDF Available
Title
On the interpretation of temperature programmed reduction patterns of transition metals sulphides
Abstract

Transition metal sulphides show the temperature programmed reduction (TPR) patterns consisting of multiple reduction domains: those at lower temperatures are attributed to the “weakly bonded” sulphur, whereas the “bulk reduction” peaks are usually placed at high temperatures. The present paper is focusing attention on the last type TPR maxima. Due to the positive free energy of reduction of catalytically important sulphides, their TPR at high temperatures is controlled by thermodynamics. For several bulk and supported sulphides, the ascending branch of the “bulk reduction” event might be transformed to a linear (ln[H2S]–1/T) plot from which standard enthalpy of reduction can be reliably extracted with good precision. Thermodynamics of sulphur abstraction from mixed sulphides (Mo–W sulphides, chromium thiospinels), or from highly dispersed bulk and supported systems can be estimated and compared using this approach.

Keywords
Sulphides; Temperature programmed reduction; Thermodynamics
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On the interpretation of temperature programmed reduction patterns of transition metals sulphides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 303, Issue 1, 18 April 2006, Pages 110–115
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
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