Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 87: Issue 3
Pozzolanic properties of a residual FCC catalyst during the early stages of cement hydration
Evaluation by thermal analysis
Authors:
Carolina Pinto Federal University of Rio de Janeiro Chemistry School Rio de Janeiro Brazil RJ

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P. Büchler University of São Paulo Chemical Engineering Department, Polytechnic School São Paulo Brazil

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J. Dweck Federal University of Rio de Janeiro Chemistry School Rio de Janeiro Brazil RJ

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Pages:
715–720
Online Publication Date:
09 Mar 2007
Publication Date:
01 Mar 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7772-2
Keywords:
catalytic cracking; DSC; NCDTA; pozzolanic activity; residual catalyst; TG
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Abstract  

The catalyst used in fluidized catalytic cracking (FCC) units of refineries after several recovery cycles in regeneration units, reduces its activity and it is partially substituted by new catalyst in the process. As it has a high silicon and aluminum oxides content, the pozzolanic properties of a Brazilian FCC spent residual catalyst, used in different substitution degrees to cement, were evaluated by three thermal analysis techniques during the early stages of hydration of a type II Portland cement. NCDTA curves show in real time that the residual catalyst, accelerates the stages of cement hydration. TG and DSC curves of respective pastes after 24 h of hydration evidence the pozzolanic activity of the waste, respectively, by the lower water mass loss during the dehydroxylation of the residual calcium hydroxide and by the lower dehydroxylation endothermal effect. Within the analyzed period, the higher is the cement substitution degree, the higher is the pozzolanic activity of the residual catalyst.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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