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Negative thermal expansion and cationic migration in zeolite Y used in FCC catalysts

  • A Dosen
  • B A MarinkovicEmail author
Article
  • 24 Downloads

Abstract

The influence of extra-framework cations on the intrinsic negative thermal expansion (NTE) of calcined ultrastable and lanthanum-exchanged zeolites Y was analysed. High-temperature thermal behaviour, cationic migration and dealumination were examined by in situ high temperature X-ray powder diffraction and thermogravimetric (TG) analyses. We analysed protonated ultrastable zeolite Y and zeolite Y containing 13% \(\hbox {La}_{2}\hbox {O}_{3}\) (LaY), and investigated how the presence of \(\hbox {La}^{3+}\) influences thermal behaviour of zeolite Y. Uncalcined LaY was also analysed to observe the \(\hbox {La}^{3+}\) migration before calcination. Mass loss up to \(990{^{\circ }}\hbox {C}\) was accompanied by TG analyses. X-ray powder diffraction data were analysed by Rietveld method. Our data show that lanthanum migration from supercages to sodalitic cavities is not reversible. However, some \(\hbox {La}^{3+}\) migration occurs above \(400{^{\circ }}\hbox {C}\) and we observe emptying of site \(\hbox {I}{'}\), migration to site I and to some extent to site \(\hbox {II}{'}\). Furthermore, we examined the dealumination process as well. Both samples show two distinct thermal behaviours, positive or near-zero thermal expansion up to \(500{^{\circ }}\hbox {C}\) and NTE above this temperature. Together with intrinsic NTE in faujasite type zeolites, the dealumination process is largely responsible for NTE at high temperatures.

Keywords

Near-zero thermal expansion in situ XRD ultrastable zeolite Y extra-framework cation lanthanum migration 

Notes

Acknowledgements

BAM is grateful to CNPq (306517/2015-9) (National Council for Scientific and Technological Development) for a research productivity grant.

Supplementary material

12034_2019_1778_MOESM1_ESM.docx (91 kb)
Supplementary material 1 (docx 91 KB)

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Chemical and Materials EngineeringPontifical Catholic University of Rio de JaneiroRio de JaneiroBrazil

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