Synthesis and characterization of hydrotalcites: [Zn1-xAlx(OH)2](CO3)X/2.mH2O; x = 0.25-0.66

M. A. Valenzuela; E. Lopez-Salinas; B. Zapata; J. A. Montoya

Synthesis and characterization of hydrotalcites: [Zn_1-xAl_x(OH)₂](CO₃)_X/2.mH₂O; x = 0.25-0.66

M. A. Valenzuela, E. Lopez-Salinas, B. Zapata, J. A. Montoya

Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE)

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

In this work a series of [Zn_1-xAl_x(OH)₂](CO₃)_x/2·mH₂O; x = 0.25-0.66 were prepared at constant pH in order to study the effect of the thermal treatment on their crystalline structure. It was found that is possible to obtain pure Zn-Al hydrotalcite materials within a x = 0.25-0.50 range in comparison with Mg-Al hydrotalcites which yield pure phases in more restricted x ranges (0.25-0.33). All Zn-Al hydrotalcites lost their layered structure at temperatures above 473 K being less stable than their parental Mg-Al hydrotalcite (623 K). Specific surface areas of these materials depended strongly on the Zn/Al ratio and calcination temperature, ranging from 280 to 20 m²/g. ZnO and ZnAl₂O₄ compounds were detected as the calcination products at temperatures higher than 873 K.

Original language	English
Pages (from-to)	79-84
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	454
State	Published - 1997
Event	Proceedings of the 1996 MRS Fall Symposium - Boston, MA, USA Duration: 2 Dec 1996 → 5 Dec 1996

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title = "Synthesis and characterization of hydrotalcites: [Zn1-xAlx(OH)2](CO3)X/2.mH2O; x = 0.25-0.66",

abstract = "In this work a series of [Zn1-xAlx(OH)2](CO3)x/2·mH2O; x = 0.25-0.66 were prepared at constant pH in order to study the effect of the thermal treatment on their crystalline structure. It was found that is possible to obtain pure Zn-Al hydrotalcite materials within a x = 0.25-0.50 range in comparison with Mg-Al hydrotalcites which yield pure phases in more restricted x ranges (0.25-0.33). All Zn-Al hydrotalcites lost their layered structure at temperatures above 473 K being less stable than their parental Mg-Al hydrotalcite (623 K). Specific surface areas of these materials depended strongly on the Zn/Al ratio and calcination temperature, ranging from 280 to 20 m2/g. ZnO and ZnAl2O4 compounds were detected as the calcination products at temperatures higher than 873 K.",

author = "Valenzuela, {M. A.} and E. Lopez-Salinas and B. Zapata and Montoya, {J. A.}",

year = "1997",

language = "Ingl{\'e}s",

volume = "454",

pages = "79--84",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

note = "Proceedings of the 1996 MRS Fall Symposium ; Conference date: 02-12-1996 Through 05-12-1996",

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TY - JOUR

T1 - Synthesis and characterization of hydrotalcites

T2 - Proceedings of the 1996 MRS Fall Symposium

AU - Valenzuela, M. A.

AU - Lopez-Salinas, E.

AU - Zapata, B.

AU - Montoya, J. A.

PY - 1997

Y1 - 1997

N2 - In this work a series of [Zn1-xAlx(OH)2](CO3)x/2·mH2O; x = 0.25-0.66 were prepared at constant pH in order to study the effect of the thermal treatment on their crystalline structure. It was found that is possible to obtain pure Zn-Al hydrotalcite materials within a x = 0.25-0.50 range in comparison with Mg-Al hydrotalcites which yield pure phases in more restricted x ranges (0.25-0.33). All Zn-Al hydrotalcites lost their layered structure at temperatures above 473 K being less stable than their parental Mg-Al hydrotalcite (623 K). Specific surface areas of these materials depended strongly on the Zn/Al ratio and calcination temperature, ranging from 280 to 20 m2/g. ZnO and ZnAl2O4 compounds were detected as the calcination products at temperatures higher than 873 K.

AB - In this work a series of [Zn1-xAlx(OH)2](CO3)x/2·mH2O; x = 0.25-0.66 were prepared at constant pH in order to study the effect of the thermal treatment on their crystalline structure. It was found that is possible to obtain pure Zn-Al hydrotalcite materials within a x = 0.25-0.50 range in comparison with Mg-Al hydrotalcites which yield pure phases in more restricted x ranges (0.25-0.33). All Zn-Al hydrotalcites lost their layered structure at temperatures above 473 K being less stable than their parental Mg-Al hydrotalcite (623 K). Specific surface areas of these materials depended strongly on the Zn/Al ratio and calcination temperature, ranging from 280 to 20 m2/g. ZnO and ZnAl2O4 compounds were detected as the calcination products at temperatures higher than 873 K.

UR - http://www.scopus.com/inward/record.url?scp=0031383684&partnerID=8YFLogxK

M3 - Artículo de la conferencia

AN - SCOPUS:0031383684

SN - 0272-9172

VL - 454

SP - 79

EP - 84

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

Y2 - 2 December 1996 through 5 December 1996

ER -

Synthesis and characterization of hydrotalcites: [Zn_1-xAl_x(OH)₂](CO₃)_X/2.mH₂O; x = 0.25-0.66

Abstract

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