Hostname: page-component-6bf8c574d5-xtvcr Total loading time: 0 Render date: 2025-02-16T01:18:19.908Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis and Characterization of Hydrotalcites: [Zn1−xAlx(OH)2](CO3)x/2·mH2O; x=0.25−0.66

Published online by Cambridge University Press:  10 February 2011

M. A. Valenzuela ,
E. López-Salinas ,
B. Zapata  and
J. A. Montoya
M. A. Valenzuela
Affiliation:
Instituto Politécnico Nacional-ESIQIE. UPALM, 07738, México D.F., Mexico
E. López-Salinas
Affiliation:
Instituto Mexicano del Petróleo, L. Cárdenas 152, 07730 México D. F.
B. Zapata
Affiliation:
Instituto Mexicano del Petróleo, L. Cárdenas 152, 07730 México D. F.
J. A. Montoya
Affiliation:
Instituto Mexicano del Petróleo, L. Cárdenas 152, 07730 México D. F.
Get access

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 srtucture. 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 hydotalcite (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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 454: Symposium S – Advanced Catalytic Materials–1996 , 1996 , 79
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Cavani, F., Trifiro, F. and Vaccari, A., Catal. Today., 11, 173 (1991).Google Scholar
2 Reichle, W.T., Chemtech, 16, 58 (1986).Google Scholar
3. Miyata, S., Clays Clay Miner., 23, 369 (1975).Google Scholar
4. Miyata, S., Clays Clay Miner., 28, 50 (1980).Google Scholar
5. Valenzuela, M.A., Aguilar, G., Bosch, P., Armedariz, H., Salas, P., Montoya, A., Catal. Lett., 15, 179 (1992).Google Scholar
6. Bosch, P., Valenzuela, M.A., Zapata, B., Acosta, D., Aguilar-Rios, G., Maldonado, C., Schifter, I., J. Mol. Catal., 93, 67 (1994).Google Scholar
7. Schaper, H., Berg-Slot, J.J. and Stork, W.H.J., Appl. Catal., 54, 79 (1989).Google Scholar
8. Thevenot, F., Szymanski, R. and Chaumette, P., Clays and Clay Miner., 37, 396 (1989).Google Scholar