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Materials 2014, 7(4), 2561-2576; doi:10.3390/ma7042561

Assessment of the Pozzolanic Activity of a Spent Catalyst by Conductivity Measurement of Aqueous Suspensions with Calcium Hydroxide

1
Facultad de Ingeniería, Universidad Panamericana Campus Guadalajara, Prolongación Calzada Circunvalación Poniente No. 49, Zapopan 54010, Mexico
2
Instituto de Ciencia y Tecnología del Hormigón (ICITECH), Universitat Politècnica de València, Camino de Vera s/n, Valencia 46071, Spain
*
Author to whom correspondence should be addressed.
Received: 18 February 2014 / Revised: 7 March 2014 / Accepted: 21 March 2014 / Published: 28 March 2014
(This article belongs to the Special Issue Construction Materials)
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Abstract

The pozzolanic activity of the spent catalyst produced by fluid catalytic cracking (FCC) has been studied by various methods in recent years. However, no quick and easy method has been reported for this activity based on the associated studies. In this work, the pozzolanic activity of a spent catalyst was investigated by measuring its electrical conductivity in aqueous suspensions of pozzolan/calcium hydroxide. The behavior of the FCC catalyst residue was compared to that of reactive and inert materials of similar chemical compositions. Further, the influence of temperature on the suspension was studied, and also, a new method was proposed in which the pozzolan/calcium hydroxide ratio was varied (with the initial presence of solid Ca(OH)2 in the system). It was concluded that the method is effective, fast and simple for evaluating the high reactivity of the catalyst. Therefore, this method is an alternative for the evaluation of the reactivity of pozzolanic materials. View Full-Text
Keywords: spent fluid catalytic cracking catalyst; pozzolanic activity; electrical conductivity measurement; pozzolan/calcium hydroxide aqueous suspension spent fluid catalytic cracking catalyst; pozzolanic activity; electrical conductivity measurement; pozzolan/calcium hydroxide aqueous suspension
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Velázquez, S.; Monzó, J.M.; Borrachero, M.V.; Payá, J. Assessment of the Pozzolanic Activity of a Spent Catalyst by Conductivity Measurement of Aqueous Suspensions with Calcium Hydroxide. Materials 2014, 7, 2561-2576.

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