Materiales de Construcción, Vol 65, No 317 (2015)

Synthesis of geopolymer from spent FCC: Effect of SiO2/Al2O<3 and Na2O/SiO2 molar ratios


https://doi.org/10.3989/mc.2015.00814

J. J. Trochez
Universidad del Valle, Colombia

R. Mejía de Gutiérrez
Universidad del Valle, Colombia

J. Rivera
Universidad del Valle, Colombia

S. A. Bernal
University of Sheffield, United Kingdom

Abstract


This paper assesses the feasibility of using a spent fluid catalytic cracking catalyst (SFCC) as precursor for the production of geopolymers. The mechanical and structural characterization of alkali-activated SFCC binders formulated with different overall (activator + solid precursor) SiO2/Al2O3 and Na2O/SiO2 molar ratios are reported. Formation of an aluminosilicate ‘geopolymer’ gel is observed under all conditions of activation used, along with formation of zeolites. Increased SiO2/Al2O3 induces the formation of geopolymers with reduced mechanical strength, for all the Na2O/SiO2 ratios assessed, which is associated with excess silicate species supplied by the activator. This is least significant at increased alkalinity conditions (higher Na2O/SiO2 ratios), as larger extents of reaction of the spent catalyst are achieved. SiO2/Al2O3 and Na2O/SiO2 ratios of 2.4 and 0.25, respectively, promote the highest compressive strength (67 MPa). This study elucidates the great potential of using SFCC as precursor to produce sustainable ceramic-like materials via alkali-activation.

Keywords


Spent fluid catalytic cracking catalyst; Alkali-activation; Geopolymers; Structural characterization

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