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Citation: ZHANG Rong-Fang, YANG Chun. Stability of Polyoxometalate/SBA-15 Mesoporous Hybrid Materials[J]. Chinese Journal of Applied Chemistry, ;2009, 26(1): 15-20. shu

Stability of Polyoxometalate/SBA-15 Mesoporous Hybrid Materials

ZHANG Rong-Fang ,
YANG Chun ^,

1.
Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097

Corresponding author: YANG Chun,
Received Date: 10 December 2007
Available Online: 12 May 2008
Fund Project: 国家自然科学基金资助项目(20473037) (20473037)江苏省教育厅自然科学基金资助项目(04KJB150069) (04KJB150069)国家人事部留学人员科技活动资助项目(2005103SB9BH51) (2005103SB9BH51)

The stabilities of polyoxometalate(POM)/mesoporous molecular sieve hybrid material SiW₁₁/SBA-15,including thermal stability,hydrothermal stability and ability against solvent-leaching,were investigated by means of TG-DTA,XRD,FT-IR,N2 adsorption-desorption and ICP-AES.It was found that POM species,SiW₁₁O₃₉[O(SiO-)₂]^6-,in the hybrid materials was less stable than the corresponding pure compound and was decomposed into SiO₂ and WO₃ under the calcination at 500 ℃.Therefore,the calcination should be avoided in the removal of the template.The POM species in the hybrid materials possesses higher stability against solvent-leaching;the percentage of the species lost in water at room temperature is much less than that of POM species in the impregnated samples,exhibiting high immobility of chemically bound species on the support.However,a considerable amount of POM was leached by hot water due to the hydrolysis of Si—O—W bonds.After hydrothermal treatment,the hexagonal mesostructure of the hybrid materials was retained,accompanied by the shrinkage in pore walls and increases in pore size and pore volume.The remains of mesostructure after removing POM species revealed that POM species mostly located on the surface of pore walls rather than within the SiO₂ network in walls.
- polyoxometalate,
- SBA-15,
- hybrid material,
- thermal and hydrothermal stability,
- solvent-leaching
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