Community Research and Development Information Service - CORDIS

Abstract

Although several studies have attempted to elucidate the mechanism by which potassium causes coke degradation, mechanisms have not yet been clearly established, nor are influences of coke structure known. There are two proposed mechanisms, involving sorption/intercalation and/or catalytic gasification. A literature review of the previous work in this field has been undertaken and an assessment of the thermodynamics of the intercalation of potassium in graphite is given. The work reported here focuses on an investigation of the effects of reaction temperature on the extent of coke degradation by potassium using inert and oxidising atmospheres. The relationship between the effect of temperature, extent of coke degradation and changes in properties of carbon/cokes before and after reaction with potassium has also been studied for carbons with a wide variety of structures after reaction with potassium vapour in an inert and oxidising atmosphere from 500-1000 C. The characterisation of the carbons included analysis for oxygen content and potassium content, microstrength tests, estimation of macropore diameter and surface area, X-ray diffraction, reactivity measurement, optical microscopy, energy dispersive analysis of X-ray (EDAX) and scanning electron microscopy (SEM).

Additional information

Authors: MARSH H, University of Newcastle upon Tyne, Department of Chemistry, Northern Carbon Research Laboratories (GB);THOMAS K M, University of Newcastle upon Tyne, Department of Chemistry, Northern Carbon Research Laboratories (GB);EDWARDS I A S, University of Newcastle upon Tyne, Department of Chemistry, Northern Carbon Research Laboratories (GB);CHAN B K C, University of Newcastle upon Tyne, Department of Chemistry, Northern Carbon Research Laboratories (GB)
Bibliographic Reference: EUR 14294 EN (1992) 86 pp., MF, ECU 4, blow-up copy ECU 9
Availability: (2)
Record Number: 199211232 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en