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Synthesis of Nd2O3 nanopowders by sol–gel auto-combustion and their catalytic esterification activity
- Source :
-
Materials Chemistry & Physics . Mar2004, Vol. 84 Issue 1, p52. 6p. - Publication Year :
- 2004
-
Abstract
- Nd2O3 nanopowders were prepared by a novel sol–gel auto-combustion method using additive agent polyvinyl alcohol. The gel transformed from the aqueous solutions of metal nitrate, citric acid and small quality of polyvinyl alcohol underwent a self-propagation combustion process when ignited and yielded voluminous ashes. These ashes were single phase Nd2O3 powders with a particle size of 20–30 nm. The influences of preparation conditions such as the molar ratio of Nd3+ to citric acid, the amount of additive agent polyvinyl alcohol, the pH value of the reaction system on the formation of the particles have been studied in detail. X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM) were used for the sample characterization. It was found that the optimum molar ratio of Nd3+ to citric acid was 1:2, the optimum amount of polyvinyl alcohol was 10% of Nd(NO3)3. In addition, we also studied the catalytic activity of nanometer Nd2O3 and super solid acid <F>SO42−</F>/Nd2O3 in the synthesis of isobutyl acetate. [Copyright &y& Elsevier]
- Subjects :
- *CATALYSIS
*COMBUSTION
*POLYVINYL alcohol
*CITRIC acid
Subjects
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 84
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 12098114
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2003.09.042