The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin
The aim of this work was to study the pyrolysis kinetics of the thermal transformation of kaolin to metakaolin with the aid of models and model free isoconversional methods. Thermal treatment in the range of 600–850 °C is used to convert kaolin into an amorphous and highly reactive metakaolin (MK)....
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my.utp.eprints.193602018-04-20T00:22:01Z The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin Irfan Khan, M. Khan, H.U. Azizli, K. Sufian, S. Man, Z. Siyal, A.A. Muhammad, N. Faiz ur Rehman, M. The aim of this work was to study the pyrolysis kinetics of the thermal transformation of kaolin to metakaolin with the aid of models and model free isoconversional methods. Thermal treatment in the range of 600–850 °C is used to convert kaolin into an amorphous and highly reactive metakaolin (MK). In this study, the thermal transformation of kaolin to metakaolin was investigated using thermokinetics and instrumental analysis. Kaolin was subjected to thermogravimetric analysis (TGA) at heating rates of 10, 20 and 40 °C/min, in the temperature range of 50–800 °C. Approximately, 14.2 of mass loss was recorded during the TG analysis. 95 of the degree of dehydroxylation was attained at 635 °C, representing the minimum temperature for this process. The TGA and its related data were analyzed using model free (based on DTG, DTA and TG) and model based kinetics methods. Both DTG and DTA peak temperatures were employed for the thermokinetics of kaolin using Ozawa, Kissinger and Starink methods; giving an Ea in the range of 246.6–252.5 kJ·mol− 1. A slight higher average Ea (266–267 kJ·mol− 1 vs 246.6–252.5 kJ·mol− 1) was observed when TGA based integral methods (KAS, FWO and Starink) were used. The mechanism of the thermokinetics was investigated using the Redfern model and the best fitting was given by 3rd order chemical reaction (F3) function. Both model-free and model based thermokinetics methods could be used to validate the thermal transformation of kaolinite to metakaolinite. © 2017 Elsevier B.V. Elsevier Ltd 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020305012&doi=10.1016%2fj.clay.2017.05.017&partnerID=40&md5=d2069ef057004f08f0f4cc44ea2872f4 Irfan Khan, M. and Khan, H.U. and Azizli, K. and Sufian, S. and Man, Z. and Siyal, A.A. and Muhammad, N. and Faiz ur Rehman, M. (2017) The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin. Applied Clay Science, 146 . pp. 152-161. http://eprints.utp.edu.my/19360/ |
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The aim of this work was to study the pyrolysis kinetics of the thermal transformation of kaolin to metakaolin with the aid of models and model free isoconversional methods. Thermal treatment in the range of 600–850 °C is used to convert kaolin into an amorphous and highly reactive metakaolin (MK). In this study, the thermal transformation of kaolin to metakaolin was investigated using thermokinetics and instrumental analysis. Kaolin was subjected to thermogravimetric analysis (TGA) at heating rates of 10, 20 and 40 °C/min, in the temperature range of 50–800 °C. Approximately, 14.2 of mass loss was recorded during the TG analysis. 95 of the degree of dehydroxylation was attained at 635 °C, representing the minimum temperature for this process. The TGA and its related data were analyzed using model free (based on DTG, DTA and TG) and model based kinetics methods. Both DTG and DTA peak temperatures were employed for the thermokinetics of kaolin using Ozawa, Kissinger and Starink methods; giving an Ea in the range of 246.6–252.5 kJ·mol− 1. A slight higher average Ea (266–267 kJ·mol− 1 vs 246.6–252.5 kJ·mol− 1) was observed when TGA based integral methods (KAS, FWO and Starink) were used. The mechanism of the thermokinetics was investigated using the Redfern model and the best fitting was given by 3rd order chemical reaction (F3) function. Both model-free and model based thermokinetics methods could be used to validate the thermal transformation of kaolinite to metakaolinite. © 2017 Elsevier B.V. |
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Article |
author |
Irfan Khan, M. Khan, H.U. Azizli, K. Sufian, S. Man, Z. Siyal, A.A. Muhammad, N. Faiz ur Rehman, M. |
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Irfan Khan, M. Khan, H.U. Azizli, K. Sufian, S. Man, Z. Siyal, A.A. Muhammad, N. Faiz ur Rehman, M. The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
author_facet |
Irfan Khan, M. Khan, H.U. Azizli, K. Sufian, S. Man, Z. Siyal, A.A. Muhammad, N. Faiz ur Rehman, M. |
author_sort |
Irfan Khan, M. |
title |
The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
title_short |
The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
title_full |
The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
title_fullStr |
The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
title_full_unstemmed |
The pyrolysis kinetics of the conversion of Malaysian kaolin to metakaolin |
title_sort |
pyrolysis kinetics of the conversion of malaysian kaolin to metakaolin |
publisher |
Elsevier Ltd |
publishDate |
2017 |
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020305012&doi=10.1016%2fj.clay.2017.05.017&partnerID=40&md5=d2069ef057004f08f0f4cc44ea2872f4 http://eprints.utp.edu.my/19360/ |
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13.160551 |