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Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
Phase evolution in low-dimensional niobium oxide synthesized by a topochemical method
Lihong Li1, Jinxia Deng, Ranbo Yu
1Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Inorganic Chemistry
|January 13, 2010
Summary
This study presents a catalyst-free method using molten salt synthesis (MSS) to create large-scale niobium pentaoxide (Nb(2)O(5)) single crystals. The process successfully synthesized both rodlike and platelet Nb(2)O(5) crystals, retaining precursor shapes.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Nanomaterials Synthesis
Background:
- Molten salt synthesis (MSS) is a versatile technique for crystal fabrication.
- Topochemical reactions offer controlled structural transformations.
- Developing scalable methods for single-crystal niobium pentaoxide is crucial for advanced applications.
Purpose of the Study:
- To develop a catalyst-free, large-scale synthesis of rodlike and platelet niobium pentaoxide (Nb(2)O(5)) single crystals.
- To investigate the structural evolution during the synthesis process.
- To explore the conversion of synthesized Nb(2)O(5) into potassium niobate (KNbO(3)).
Main Methods:
- Utilizing molten salt synthesis (MSS) to prepare precursor materials KNb(3)O(8) and K(4)Nb(6)O(17).
- Applying proton exchange and subsequent heat treatment for topochemical conversion.
- Characterizing structural and morphological changes using Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
Main Results:
- Successfully synthesized rodlike H-Nb(2)O(5) and platelet T-Nb(2)O(5) single crystals.
- The synthesized Nb(2)O(5) single crystals preserved the morphology of their precursors.
- Structural analysis confirmed the topochemical transformation and proposed a reaction mechanism.
- Rodlike and platelet potassium niobate (KNbO(3)) powders were successfully derived from the synthesized Nb(2)O(5).
Conclusions:
- A novel catalyst-free topochemical method combined with MSS enables large-scale synthesis of Nb(2)O(5) single crystals.
- The method allows for controlled morphology (rodlike and platelet) of Nb(2)O(5).
- The synthesized Nb(2)O(5) serves as a viable precursor for producing KNbO(3) powders with controlled shapes.
