Memory Effect on a LDH/zeolite A Composite: An XRD In Situ Study
Autor: | Lindiane Bieseki, Breno Gustavo Porfírio Bezerra, Mariele I. S. de Mello, Sibele B. C. Pergher, Cristiane B Rodella, Djalma Ribeiro da Silva |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Technology
Materials science Scanning electron microscope XRD Composite number Energy-dispersive X-ray spectroscopy 02 engineering and technology memory effect 010402 general chemistry 01 natural sciences Article zeolite A law.invention law Phase (matter) General Materials Science Calcination Lamellar structure Zeolite Inert gas Microscopy QC120-168.85 QH201-278.5 in situ experiments LDH composite 021001 nanoscience & nanotechnology Engineering (General). Civil engineering (General) 0104 chemical sciences TK1-9971 Descriptive and experimental mechanics Electrical engineering. Electronics. Nuclear engineering TA1-2040 0210 nano-technology Nuclear chemistry |
Zdroj: | Materials Volume 14 Issue 9 Materials, Vol 14, Iss 2102, p 2102 (2021) |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma14092102 |
Popis: | In this memory effect study, hydrotalcite-type compounds in the lamellar double hydroxide-like (LDH)/zeolite A composite material were analyzed using X-Ray Diffration XRD) in situ experiments. Three samples were analyzed: Al,Mg-LDH, Al,Mg-LDH/ZA composite, and a physical mixture (50/50 wt%) of zeolite A and Al,Mg-LDH. The Al,Mg-LDH sample was treated at 500 °C in an O2 atmosphere and subsequently rehydrated. The Al,Mg-LDH/ZA composites had three treatments: one was performed at 300 °C in a He atmosphere, and two treatments were performed with an O2 atmosphere at 300 and 500 °C. In the physical mixture, two treatments were carried out under O2 flow at 500 °C and under He flow at 300 °C. Both went through the rehydration process. All samples were also analyzed by energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The results show that the LDH phase in the Al,Mg-LDH/ZA compounds has memory effects, and thus, the compound can be calcined and rehydrated. For the LDH in the composite, the best heat treatment system is a temperature of 300 °C in an inert atmosphere. |
Databáze: | OpenAIRE |
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