Synthesis and Structure Characterization of Chromium Oxide Prepared by Solid Thermal Decomposition Reaction
2005; American Chemical Society; Volume: 110; Issue: 1 Linguagem: Inglês
10.1021/jp053810b
ISSN1520-6106
AutoresLi Li, Zi Feng Yan, Gao Qing Lu, Zhonghua Zhu,
Tópico(s)Advanced Photocatalysis Techniques
ResumoMesoporous chromium oxide (Cr2O3) nanocrystals were first synthesized by the thermal decomposition reaction of Cr(NO3)3·9H2O using citric acid monohydrate (CA) as the mesoporous template agent. The texture and chemistry of chromium oxide nanocrystals were characterized by N2 adsorption−desorption isotherms, FTIR, X-ray diffraction (XRD), UV−vis, and thermoanalytical methods. It was shown that the hydrate water and CA are the crucial factors in influencing the formation of mesoporous Cr2O3 nanocrystals in the mixture system. The decomposition of CA results in the formation of a mesoporous structure with wormlike pores. The hydrate water of the mixture provides surface hydroxyls that act as binders, making the nanocrystals aggregate. The pore structures and phases of chromium oxide are affected by the ratio of precursor-to-CA, thermal temperature, and time.
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