In situ transformation of geopolymer gels to self-supporting NaX zeolite monoliths with excellent compressive strength

Hongquan Wang, Chunjie Yan, Dan Li, Feng Zhou, Yi Liu, Chunyu Zhou, Sridhar Komarneni

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Geopolymers are a new class of green high-strength aluminosilicate materials, which generally maintain an amorphous structure due to the limitations related to their chemical compositions and reaction conditions but possess the ability to form molecular sieves. In this work, the in-situ transformation of geopolymers into self-supporting NaX zeolite monoliths of relatively large sizes was examined under hydrothermal conditions and various parameters of the synthesis process were optimized. The obtained results indicated that the optimal transformation conditions for geopolymers with a Si/Al ratio of 4.0 are as follows: precursors composed of metakaolin and modified industrial sodium silicate with a Na2O/SiO2 molar ratio of 1.0, H2O/Na2O molar ratio of 70, hydrothermal synthesis time of 18 h and a temperature of 90 °C. According to the obtained X-ray diffraction (XRD) data, the synthesized NaX Monoliths exhibited characteristic reflections consistent with those of standard NaX zeolites and possessed high degrees of crystallinity, while scanning electron microscopy revealed that the produced molecular sieves exhibited well-defined morphology. In addition, the zeolitic monoliths exhibited excellent compressive strength for potential practical applications.

Original languageEnglish (US)
Pages (from-to)164-169
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume261
DOIs
StatePublished - May 1 2018

Fingerprint

Geopolymers
Zeolites
compressive strength
Compressive strength
Gels
Molecular sieves
gels
absorbents
sodium silicates
Aluminosilicates
Hydrothermal synthesis
synthesis
high strength
zeolites
Silicates
crystallinity
chemical reactions
chemical composition
Sodium
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Wang, Hongquan ; Yan, Chunjie ; Li, Dan ; Zhou, Feng ; Liu, Yi ; Zhou, Chunyu ; Komarneni, Sridhar. / In situ transformation of geopolymer gels to self-supporting NaX zeolite monoliths with excellent compressive strength. In: Microporous and Mesoporous Materials. 2018 ; Vol. 261. pp. 164-169.
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In situ transformation of geopolymer gels to self-supporting NaX zeolite monoliths with excellent compressive strength. / Wang, Hongquan; Yan, Chunjie; Li, Dan; Zhou, Feng; Liu, Yi; Zhou, Chunyu; Komarneni, Sridhar.

In: Microporous and Mesoporous Materials, Vol. 261, 01.05.2018, p. 164-169.

Research output: Contribution to journalArticle

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T1 - In situ transformation of geopolymer gels to self-supporting NaX zeolite monoliths with excellent compressive strength

AU - Wang, Hongquan

AU - Yan, Chunjie

AU - Li, Dan

AU - Zhou, Feng

AU - Liu, Yi

AU - Zhou, Chunyu

AU - Komarneni, Sridhar

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Geopolymers are a new class of green high-strength aluminosilicate materials, which generally maintain an amorphous structure due to the limitations related to their chemical compositions and reaction conditions but possess the ability to form molecular sieves. In this work, the in-situ transformation of geopolymers into self-supporting NaX zeolite monoliths of relatively large sizes was examined under hydrothermal conditions and various parameters of the synthesis process were optimized. The obtained results indicated that the optimal transformation conditions for geopolymers with a Si/Al ratio of 4.0 are as follows: precursors composed of metakaolin and modified industrial sodium silicate with a Na2O/SiO2 molar ratio of 1.0, H2O/Na2O molar ratio of 70, hydrothermal synthesis time of 18 h and a temperature of 90 °C. According to the obtained X-ray diffraction (XRD) data, the synthesized NaX Monoliths exhibited characteristic reflections consistent with those of standard NaX zeolites and possessed high degrees of crystallinity, while scanning electron microscopy revealed that the produced molecular sieves exhibited well-defined morphology. In addition, the zeolitic monoliths exhibited excellent compressive strength for potential practical applications.

AB - Geopolymers are a new class of green high-strength aluminosilicate materials, which generally maintain an amorphous structure due to the limitations related to their chemical compositions and reaction conditions but possess the ability to form molecular sieves. In this work, the in-situ transformation of geopolymers into self-supporting NaX zeolite monoliths of relatively large sizes was examined under hydrothermal conditions and various parameters of the synthesis process were optimized. The obtained results indicated that the optimal transformation conditions for geopolymers with a Si/Al ratio of 4.0 are as follows: precursors composed of metakaolin and modified industrial sodium silicate with a Na2O/SiO2 molar ratio of 1.0, H2O/Na2O molar ratio of 70, hydrothermal synthesis time of 18 h and a temperature of 90 °C. According to the obtained X-ray diffraction (XRD) data, the synthesized NaX Monoliths exhibited characteristic reflections consistent with those of standard NaX zeolites and possessed high degrees of crystallinity, while scanning electron microscopy revealed that the produced molecular sieves exhibited well-defined morphology. In addition, the zeolitic monoliths exhibited excellent compressive strength for potential practical applications.

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